Sulfating Patents (Class 423/106)
  • Patent number: 10563287
    Abstract: A method of leaching copper-containing ores, such as chalcopyrite ores, with a leach liquor in the presence of silver and an activation agent that activates silver whereby the silver enhances copper extraction from copper ores.
    Type: Grant
    Filed: December 21, 2018
    Date of Patent: February 18, 2020
    Assignee: Technological Resources Pty. Limited
    Inventors: Ralph Peter Hackl, Paul Leslie Brown, Stephen Charles Grocott, Daniel Arthur Kittelty
  • Patent number: 9981295
    Abstract: A method for vitrification of arsenic and antimony, comprising substituting oxygen to sulfur on thiosalts, incorporating resulting sodium arsenate and sodium antimonate into a sodium silicate glass-forming mixture and vitrifying the sodium silicate glass-forming mixture into a resulting glass sequestering the arsenic and antimony.
    Type: Grant
    Filed: July 21, 2016
    Date of Patent: May 29, 2018
    Assignee: DUNDEE SUSTAINABLE TECHNOLOGIES INC.
    Inventors: Jean-Marc Lalancette, David Lemieux, Khalil Nasrallah, Gabriel Garcia Curiel, Romain Barbaroux
  • Patent number: 9890055
    Abstract: A method of producing (high-purity) hematite for ironmaking includes adding an oxidant and sulfuric acid to nickel oxide ore and then leaching nickel. The method further includes forming a neutralized residue having a sulfur grade exceeding 1.0% by weight by adding a neutralizing agent to leach slurry and being subjected to solid-liquid separation. The neutralizing agent functions to form plaster by reaction with a free sulfuric acid of surplus acid contained in the leach slurry. The leach slurry is a mixture of a leachate and a leach residue obtained after leaching the nickel. The method then includes heating the neutralized residue at a heating temperature of 600° C. or more and 1400° C. or less to form hematite having a sulfur grade of 1.0% or less by weight.
    Type: Grant
    Filed: September 4, 2014
    Date of Patent: February 13, 2018
    Assignee: SUMITOMO METAL MINING CO., LTD.
    Inventors: Hideki Sasaki, Yasumasa Kan, Hiroyuki Mitsui
  • Patent number: 8696931
    Abstract: A method of production of activated carbon for removal of mercury gas which provides activated carbon impregnated with both sulfur and iodine which gives a higher mercury gas adsorption performance compared with a conventional activated carbon adsorbent and also enables the prime cost of manufacture to be kept down, that is, a method of production provided with a sulfur impregnation step which adds sulfur to activated carbon and heats the mixture to obtain sulfur-impregnated activated carbon comprised of activated carbon to 100 parts by weight of which sulfur is impregnated in 5 to 20 parts by weight and, after the sulfur impregnation step, an iodine substance impregnation step which adds an aqueous solution containing iodine and an iodine salt to the sulfur-impregnated activated carbon.
    Type: Grant
    Filed: October 10, 2011
    Date of Patent: April 15, 2014
    Assignee: Futamura Kagaku Kabushiki Kaisha
    Inventors: Hideto Mamiya, Sunao Inada
  • Patent number: 8545626
    Abstract: A method for efficiently producing a plate-like nitride semiconductor crystal having the desired principal plane in a simple method is provided. A raw material gas is fed to a seed crystal in which a ratio (L/W) of length L in a longitudinal direction and maximum width W, of a plane of projection obtained by projecting a crystal growth face on the seed crystal in a growth direction is from 2 to 400, and the maximum width W is 5 mm or less, thereby growing a plate-like semiconductor crystal on the seed crystal.
    Type: Grant
    Filed: March 2, 2009
    Date of Patent: October 1, 2013
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Kenji Fujito, Shuichi Kubo, Yoko Mashige
  • Patent number: 8491858
    Abstract: In some embodiments, the invention provides systems and methods for removing carbon dioxide and/or additional components of waste gas streams, comprising contacting the waste gas stream with an aqueous solution, removing carbon dioxide and/or additional components from the waste gas stream, and containing the carbon dioxide and/or additional components, in one form or another, in a composition. In some embodiments, the composition is a precipitation material comprising carbonates, bicarbonates, or carbonates and bicarbonates. In some embodiments, the composition further comprises carbonate and/or bicarbonate co-products resulting from co-processing SOx, NOx, particulate matter, and/or certain metals. Additional waste streams such as liquid, solid, or multiphasic waste streams may be processed as well.
    Type: Grant
    Filed: October 5, 2011
    Date of Patent: July 23, 2013
    Assignee: Calera Corporation
    Inventors: William Randall Seeker, Brent Constantz, Vinod Khosla
  • Patent number: 7939037
    Abstract: Method for producing hydrometallurgical zinc oxide powder having characteristics equivalent to that derived from a French process, comprising formation of an aqueous pulp from a starting zinc oxide having particles of nodular structure, wet milling of this aqueous pulp, separation in this milled pulp between a liquid phase and a solid phase containing the zinc oxide, and drying of said solid phase, coupled with a mechanical deagglomeration of the particles during drying, to obtain a dry zinc oxide powder with particles of nodular structure having a particle size distribution where the particles have an average size (d50) between 0.02 and 20 ?m.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: May 10, 2011
    Assignee: Zincox Resources PLC
    Inventors: Kevin Clais, Duncan Turner, Philippe Leblanc, Antoine Masse
  • Patent number: 7862786
    Abstract: A method for recovering zinc ions by selective zinc sulfide precipitation from an aqueous solution comprising zinc ions and metal ions of a metal that precipitates as a metal sulfide at a pH lower than a pH at which zinc ions precipitate as a zinc sulfide.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: January 4, 2011
    Assignee: Barrick Gold Corporation
    Inventors: Yeonuk Choi, Peter Kondos, Jacques McMullen
  • Patent number: 7563429
    Abstract: A process for reclaiming spent selenium filter mass containing an inert material. The spent mass is treated with a hydrogen peroxide solution for leaching out selenium content from unspent active substance present in the filter mass to form selenious acid. The filter mass is treated with aqua regia solution to dissolve mercury selenide present in the mass. The aqua regia solution is separated from the mass and isolated. Suitably, the filter mass, which now contains inert carrier material, is transferred with the isolated selenious acid, to production of new selenium filter mass. After partial neutralization of the aqua regia solution, mercury is precipitated out for disposal. Before this, elemental selenium can be separated from the aqua regia solution by adjusting the pH level and used advantageously for production of new filter mass. Thusly, reclaimed selenium content and inert carrier material can be advantageously used for production of new selenium filters.
    Type: Grant
    Filed: December 16, 2004
    Date of Patent: July 21, 2009
    Assignee: Outotec Oyj
    Inventor: Yngve Lundgren
  • Patent number: 7517511
    Abstract: Mercury emissions in an exhaust gas are mitigated. Mercury dichloride is formed upon a surface from a substantial portion of the mercury in the exhaust gas. The mercury dichloride sublimes from the surface, and the sublimed mercury dichloride is subsequently removed from the exhaust stream.
    Type: Grant
    Filed: May 1, 2003
    Date of Patent: April 14, 2009
    Assignee: The Regents of the University of California
    Inventor: Keith Schofield
  • Patent number: 6846346
    Abstract: The invention provides a hydrometallurgical process for treating metal-containing sulfide ores and concentrates, comprising reacting said metal-containing sulfide with concentrated sulfuric acid at a temperature of between about 300° C. and 400° C. in the presence of oxygen to produce a solid metal sulfate product and a gaseous product which is primarily SO3, wherein said metal is selected from the group consisting of iron, copper, zinc, nickel, cobalt and manganese. Said metal sulfate product is then leached with dilute sulfuric acid to form a metal-containing solution, from which the metal values are separated by precipitation at raised H2SO4 concentrations obtained by saturating the solution with the gaseous SO3 from the sulfatization reaction step.
    Type: Grant
    Filed: August 29, 2000
    Date of Patent: January 25, 2005
    Assignee: Joma Chemicals AS
    Inventor: Solomon Flax
  • Patent number: 6835228
    Abstract: A process of recovering metals from waste lithium ion/Ni—H/Ni—Cd batteries, wherein the waste batteries are calcined and sieved to generate an ash containing metals and metal oxides. The process includes subjecting the ash to a first dissolution etching treatment, a first filtration treatment to obtain a filtrate containing Cd ions which are crystallized as cadmium sulfate, a second dissolution etching treatment for the filtered solid, and a second filtration treatment to obtain a second filtrate. Fe+3, Al+3 and rare earth metal ions in the second filtrate are precipitated as hydroxides by adding a base to the second filtrate. The remaining solution was extracted and counter-extracted to obtain aqueous solutions of Co and Ni ions, which were subjected separately to a electrolysis to deposit Co and Ni metals. Li ions in the residue solution from the electrolysis of Ni was precipitated as carbonate by adding a soluble carbonate salt.
    Type: Grant
    Filed: November 19, 2003
    Date of Patent: December 28, 2004
    Assignee: Industrial Technology Research Institute
    Inventors: Jiunn-Ren Lin, I-Long Chang, Yu-Lin Jiang, Jer-Yuan Shiu
  • Publication number: 20040191144
    Abstract: The present invention relates to new crystalline, molecular sieve CIT-6 that has the topology of zeolite beta. CIT-6 can be in an all-silica form, in a form wherein zinc is in the crystal framework, or a form containing silicon oxide and non-silicon oxides. In a preferred embodiment, CIT-6 has a crystal size of less than one micron and a water adsorption capacity of less than 0.05 g/g.
    Type: Application
    Filed: March 8, 2004
    Publication date: September 30, 2004
    Applicant: California Institute of Technology
    Inventors: Takahiko Takewaki, Mark E. Davis
  • Publication number: 20030231995
    Abstract: The use of ozone during certain stages of metal separation by flotation degrades certain collectors that are absorbed on the particle surface, as well as the collectors and frothers in the liquid slurry. As a result, the mineral particle has a fresh surface and new chemical reagent(s) can be added in the subsequent flotation step(s). Also since ozone oxidizes the iron sulfide particles faster than the other mineral particles, depending upon the duration of treatment, the ozone concentration, and the kg O3/ton consumed by the treated ore, the surface of the iron sulfide particles may be partially or even totally oxidized, thus allowing better separation. As a consequence, the iron content is decreased, and the grade of the mineral value such as zinc, copper, and nickel increases. Also, sulfide emissions during heat treatment or further processing of the minerals are decreased due to decrease iron sulfide content.
    Type: Application
    Filed: February 12, 2003
    Publication date: December 18, 2003
    Inventors: Javier Jara, Yawo Zuttah
  • Patent number: 6203769
    Abstract: The invention relates to a method for the treatment of fluoboric electrolyte resulting from the processes of electro-extraction of metals such as copper and lead comprising a leaching stage with fluoboric acid, in order to recycle said fluoboric acid to be recirculated to said leaching stage devoid of impurities of metals such as Me=Fe, Zn, Ca, Mg, Cd, characterized in that it comprises the stages of: a) treating said fluoboric electrolyte comprising Cu(BF4)2 or Pb(BF4)2 with H2S in order to precipitate CuS or PbS respectively in accordance with the reactions Cu(BF4)2+H2S=>CuS+2HBF4  (1) Pb(BF4)2+H2S=>PbS+2HBF4  (2) thus obtaining a solution of HBF4 containing the fluoborates of said metals Me, said solution being separated, b) treating said Me fluoborates with H2SO4 in accordance with the reaction 2 Me(BF4)n+n H2SO4=>Me(SO4)n+2n HBF4  (3) (where Me=Fe, Zn, Ca, Mg, Cd) it being possible for said sulp
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: March 20, 2001
    Assignee: Ecochem Aktiengesellschaft
    Inventor: Gianni Zoppi
  • Patent number: 5711922
    Abstract: A hydrometallurgical process for converting zinc sulfide in an ore containing zinc sulfide, said zinc sulfide being chemically converted at elevated temperatures to ZnSO.sub.4.xH.sub.2 O which crystallizes substantially in the monohydrate formas ZnSO.sub.4.H.sub.2 O in a conversion solution having a high concentration of H.sub.2 S.sub.4. The process comprises:i) contacting the zinc sulfide of the ore with the conversion solution which comprises a concentration of sulfuric acid selected from the range of about 45% by weight up to about 70% by weight of the conversion solution and at the elevated temperature in the range of 90.degree. C. to less than boiling point of the conversion solution for the selected concentration of sulfuric acid;ii) maintaining the conversion solution at the elevated temperature and at the range of concentration of the sulfuric acid to ensure continued formation of the crystals of ZnSO.sub.4.H.sub.
    Type: Grant
    Filed: March 26, 1996
    Date of Patent: January 27, 1998
    Inventors: Robert N. O'Brien, Ernest Peters
  • Patent number: 5484579
    Abstract: A continuous hydrometallurgical process for conversion of ore derived copper and zinc sulfides into recoverable water soluble sulfates is provided. The process comprises:i) contacting the ore derived copper and zinc sulfides with sulfuric acid and with nitric acid to form a reaction mixture in an acidic solution,ii) maintaining the reaction mixture at a temperature in the range of 110.degree. C. to 170.degree. C. while continuously mixing the reaction mixture,iii) adding sufficient sulfuric acid and nitric acid to the reaction mixture to form a light precipitate and a dark precipitate in the reaction mixture, the light precipitate comprising water soluble sulfate salts of copper sulfate, zinc sulfate and iron sulfate, and the dark precipitate being water insoluble and comprising mainly elemental sulfur and gangue,iv) introducing a source of oxygen to the reaction mixture to promote oxidation in the presence of the nitric acid, of the sulfides to sulfates and to oxidize gaseous NO.sub.
    Type: Grant
    Filed: September 19, 1994
    Date of Patent: January 16, 1996
    Assignee: R & O Mining Processing Ltd.
    Inventor: Robert N. O'Brien
  • Patent number: 5433855
    Abstract: A process for extracting metal values especially zinc values from aqueous solutions of metal salts which comprises contacting the aqueous solution with an organic phase comprising a compound of the formula: ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently, represents an optionally substituted hydrocarbyl or hydrocarbyloxy group or R.sup.1 and R.sup.2 together with the attached phosphorus atom and/or R.sup.3 and R.sup.4 together with the attached phosphorus atom form a 5- to 8-membered heterocyclic ring.
    Type: Grant
    Filed: December 3, 1993
    Date of Patent: July 18, 1995
    Assignee: Zeneca Limited
    Inventors: John Campbell, Raymond F. Dalton, Peter M. Quan
  • Patent number: 5393431
    Abstract: A process for extracting metal values especially zinc values from aqueous solutions of metal salts which comprises contacting the aqueous solution with an organic phase comprising a compound of the formula: ##STR1## wherein each of R.sup.1, R.sup.2, R.sup.3 and R.sup.4, independently, represents a substituted hydrocarbyl or hydrocarbyloxy group or R.sup.1 and R.sup.2 together with the attached phosphorus atom and/or R.sup.3 and R.sup.4 together with the attached phosphorus atom form a 5- to 8-membered heterocyclic ring.
    Type: Grant
    Filed: June 4, 1993
    Date of Patent: February 28, 1995
    Assignee: Zeneca Limited
    Inventors: John Campbell, Raymond F. Dalton, Peter M. Quan
  • Patent number: 5348713
    Abstract: A process is disclosed for recovering zinc, lead, copper and precious metals from zinc plant residue, said process comprising leaching the residue with return zinc spent electrolyte, neutralizing residual acid and reducing ferric iron in the solution by addition of zinc sulphide concentrate in the presence of a limited quantity of oxygen, flotation of the resulting slurry to separate unreacted zinc sulphide, treatment of flotation tailings with sulphur dioxide and elemental sulphur to further leach iron, zinc and impurity elements and precipitate copper, flotation of the resulting slurry to separate a copper sulphide concentrate, thickening, filtering and washing of the flotation tailings followed by addition of lime and sodium sulphide to activate lead sulphate and flotation of a lead concentrate from the residue.
    Type: Grant
    Filed: August 14, 1992
    Date of Patent: September 20, 1994
    Assignee: Sherritt Gordon Limited
    Inventors: Derek E. Kerfoot, Michael J. Collins, Michael E. Chalkley
  • Patent number: 5332560
    Abstract: A method for the recovery of copper from copper-containing materials, for example, scrap, ores or dust. An aqueous cupric tetrammine sulfate lixiviant is contacted with the copper-containing material to produce a leachate containing cuprous, nickel, and zinc ions, ammonium sulfate and free ammonia. Copper can be recovered from the leachate by electrolysis. Nickel and zinc can be precipitated from the resulting spent electrolyte by oxidizing substantially all of the cuprous ions in the copper ammine sulfate solution to cupric ions and lowering the pH of the solution to a range from about pH 7.5 to about pH 8.0 in order to form a precipitate. Alternatively, copper sulfate can be added to the cupric ammine sulfate-containing solution in order to form nickel and/or zinc containing precipitate.
    Type: Grant
    Filed: March 5, 1993
    Date of Patent: July 26, 1994
    Assignee: Cato Research Corporation
    Inventors: William H. Kruesi, Paul R. Kruesi
  • Patent number: 5316751
    Abstract: A method for site remediation for mitigating contamination from metals or metal compounds, particularly resulting from the situation of mine tailing waste on or near water sources, including the reprocessing and redeposit of separated sands and slimes in-site in a manner to encourage rather than inhibit leaching of residuals by chelating agents or biological agents with recovery of leachate and removal of metals or metal compounds.
    Type: Grant
    Filed: February 11, 1991
    Date of Patent: May 31, 1994
    Inventors: Gordon Kingsley, Richard E. Peterson
  • Patent number: 5286465
    Abstract: A process for recovering zinc/rich and iron-rich fractions from the baghouse dust that is generated in various metallurgical operations, especially in steel-making and other iron-making plants, comprises the steps of leaching the dust by hot concentrated sulfuric acid so as to generate dissolved zinc sulfate and a precipitate of iron sulfate, separating the precipitate from the acid by filtration and washing with a volatile liquid, such as methanol or acetone, and collecting the filtered acid and the washings into a filtrate fraction. The volatile liquid may be recovered distillation, and the zinc may be removed from the filtrate by alternative methods, one of which involves addition of a sufficient amount of water to precipitate hydrated zinc sulfate at 10.degree. C., separation of the precipitate from sulfuric acid by filtration, and evaporation of water to regenerate concentrated sulfuric acid.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: February 15, 1994
    Inventors: Solomon Zaromb, Daniel B. Lawson
  • Patent number: 5200042
    Abstract: A process for recovery of copper from a copper residue obtained during purification of a zinc sulfate solution comprises leaching the copper residue in a concentrated sulfuric acid solution in the presence of an oxidant at a temperature of between 60.degree. and 80.degree. C. and separating the solids from the leach solution, electrowinning copper from the leach solution, returning the electrolyte solution to the initial leaching stage to initiate dissolution of the copper residue, and bleeding a portion of the electrolyte solution to reduce the concentration of impurities in the solution.
    Type: Grant
    Filed: June 10, 1991
    Date of Patent: April 6, 1993
    Assignee: Noranda Inc.
    Inventors: George Houlachi, Carole Allen, Francis Belanger
  • Patent number: 5178771
    Abstract: Concentrations of cobalt and copper of electrolysis solution for electrowinning of zinc can be measured any time during electrowinning operation by continuously sampling the solution, diluting it, adding coloring reagent to the flow of the solution and spectrophotometrically analyzing the solution.The cobalt and copper as deleterious impurities can be removed continuously and automatically by measuring their concentrations by the above method and adding precipitation reagents for them in an amount calculated by a microcomputer on the basis of said analysis.
    Type: Grant
    Filed: May 24, 1991
    Date of Patent: January 12, 1993
    Assignee: Mitsubishi Materials Corporation
    Inventors: Yutaka Hayashibe, Minoru Takeya, Kazunori Yamashita, Mamoru Minami
  • Patent number: 5135652
    Abstract: Zinc is selectively extracted from zinc sulfate solutions that may also contain sulfuric acid and amounts of other metals with an organic extractant mixture containing both organic substituted phosphoric acid and organic substituted thiophosphinic acid. The phosphoric acids are preferably chosen from mono- and di-2-ethylhexylphosphoric acids and mixtures thereof, and the phosphinic acids are preferably chosen from bis- 2, 4, 4-trimethylpentyl mono- and dithiophosphinic acids. The use of an extractant mixture of the dithiophosphinic acid with mono- and di-2-ethylhexyl phosphoric acids or an extractant mixture of the dithiophosphinic acid with di-2-ethylhexylphosphoric acid is preferred. The pH during zinc extraction is controlled at a value in the range of about 1.3 to 5. Control of pH is carried out either by neutralization or by acid extraction with an organic amine-type extractant. The acid content of the feed solution may be reduced by neutralization or acid removal by dialysis.
    Type: Grant
    Filed: October 25, 1990
    Date of Patent: August 4, 1992
    Assignee: Cominco Ltd.
    Inventor: Daniel A. D. Boateng
  • Patent number: 5128047
    Abstract: A process for separately removing zinc and iron from acidic wastewater. The process involves adding alkali metal hydroxide to the acidic wastewater (below about pH 4) to achieve a first pH of about 4.8 to at most about 5.4 and precipitate an iron hydroxide-containing precipitate at this pH. The precipitate from the wastewater is separated and then additional alkali metal hydroxide is added to achieve a second pH in the range from about 8.8 to about 9.4. A zinc hydroxide containing precipitate forms at this second pH and is then recovered by filtration.
    Type: Grant
    Filed: April 20, 1990
    Date of Patent: July 7, 1992
    Assignee: Rhone-Poulenc Inc.
    Inventors: John M. Stewart, George Chan
  • Patent number: 5082638
    Abstract: The invention relates to a process for recovering non-ferrous metal values such as nickel, cobalt, copper, zinc, manganese and magnesium from material containing said metals, by converting the non-ferrous metal values into sulphates by using melt and melt coating sulphation and recovering them as metal compounds by a process entity based on a melt and melt coating sulphation.
    Type: Grant
    Filed: November 30, 1990
    Date of Patent: January 21, 1992
    Inventors: Pekka J. Saikkonen, Jussi K. Rastas
  • Patent number: 5017346
    Abstract: A process of refining zinc oxide from roasted zinc sulphide bearing concentrates comprises leaching the concentrate in an aqueous sulphur dioxide solution under controlled conditions providing selective separation of zinc from other elements contained in the concentrate. The zinc bisulphite solution so obtained is separated from the remaining solids and is heat treated, preferably with steam, to precipitate zinc monosulphite crystals, possibly after first adding zinc dust to the solution to cement out residual copper and cadmium. The zinc monosulphite is then separated from the solution, possibly washed with water, and calcined to yield purified zinc oxide.
    Type: Grant
    Filed: May 11, 1988
    Date of Patent: May 21, 1991
    Assignee: Ecolomics Inc.
    Inventors: Donald R. Spink, Murry C. Robinson, Kim D. Nguyen
  • Patent number: 4715939
    Abstract: Monovalent ions, especially chloride and fluoride, but also thallium, sodium and potassium are efficiently removed from ZnSO.sub.4 electrolyte by electrodialysis. Monovalent anions are removed using alternating monovalent anion permselective membranes and cation exchange membranes. Monovalent anions and cations are removed using alternating monovalent anion and monovalent cation permselective membranes. Electrodialysis is carried out under turbulent conditions, at up to 60.degree. C., a differential membrane pressure of less than 150 kPa, a current density of 10 to 500 A/m.sup.2, and a pH of less than 5.5. Where both chloride and fluoride are removed a pH of 3.5 to 5.5 is maintained.
    Type: Grant
    Filed: April 21, 1987
    Date of Patent: December 29, 1987
    Assignee: Cominco Ltd.
    Inventors: Donald L. Ball, Daniel A. D. Boateng
  • Patent number: 4698139
    Abstract: The purpose of the method is to remove chlorides and fluorides from a valuable metal raw material by leaching the raw material into sulphuric acid solution and by crystallizing the valuable metal sulphate selectively out of the solution. The valuable metal sulphate crystals are washed in sulphuric acid solution, and the recovered dechlorinated and defluorinated crystals are leached into water and conducted into electrolysis. The sulphuric acid solution employed in the raw material leaching and in the crystal washing is preferably the same as the return acid of the electrolysis. Chlorides and fluorides are removed from the mother liquor of crystallization in the bleed.
    Type: Grant
    Filed: January 6, 1986
    Date of Patent: October 6, 1987
    Assignee: Outokumpu Oy
    Inventors: Sigmund P. Fugleberg, Jaakko I. Poijarvi
  • Patent number: 4671945
    Abstract: This is a method for the complete leaching of the valuable metals in a metal sulphide material which contains copper, zinc, lead, silver and iron by the use of a solution which essentially contains cupric chloride/sulphates. After the valuable metals have been recovered, the solution is regenerated whereby ferrous chloride and cuprous chloride/sulphate is oxidized to a ferric hydroxide solid and a cupric chloride solution respectively. The regenerated solution is split into two part-solutions and returned to the process.One part-solution goes to a metathesis stage where the fresh metal sulphide material is added in large excess with respect to the part-solutions's content of copper. The result is that only the valuable metals like zinc, lead and silver are leached while copper and iron remain in the residue.The other part-solution goes to a leach stage where the residue from the metathesis stage is added.
    Type: Grant
    Filed: October 29, 1985
    Date of Patent: June 9, 1987
    Inventors: Thomas Thomassen, Carl O. Kostol
  • Patent number: 4637832
    Abstract: A process for purifying aqueous solutions of zinc sulphate removed from leaching processes and containing metals such as Cu, Cd, Ti, Ni, Co, Ge, As, Sb which consists in cementing said metals with zinc dust and with a couple of activators chosen between Cu-As and Cu-Sb in one or more reaction vessels having a bottom portion of cylindrical shape, an intermediate portion of cone frustum shape, and a top portion having an enlarged section thereof.
    Type: Grant
    Filed: August 1, 1984
    Date of Patent: January 20, 1987
    Assignee: SAMIM Societa Azionaria Minero-Mettallurgica, S.p.A.
    Inventors: Sergio Cammi, Arturo D'Este, Alessandro Pescetelli
  • Patent number: 4610721
    Abstract: A process is provided for selectively recovering zinc from steel plant dust containing substantial amounts of iron. The process comprises atmospherically leaching the steel plant dust in a first stage wherein an amount of steel plant dust is mixed with an amount of acidic zinc sulfate solution to leach zinc therefrom, the leaching of the dust being such that the solution is controlled to a terminal pH ranging from about 2 to 3.5 and preferably from about 2.5 to 3.5, thereby limiting iron dissolution. The mixture is then subjected to a crude liquid/solid separation step whereby a thickened pulp is produced containing zinc and iron values and a separated liquid containing low iron and substantial amounts of zinc, the solution being sent to zinc recovery.
    Type: Grant
    Filed: January 31, 1985
    Date of Patent: September 9, 1986
    Assignee: AMAX Inc.
    Inventors: Willem P. C. Duyvesteyn, Mahesh C. Jha
  • Patent number: 4594102
    Abstract: A process for recovering cobalt and nickel values from cobalt and nickel containing sulphidic material also containing iron includes roasting the sulphidic material to produce a calcine containing water soluble cobalt and nickel sulphate, and leaching the calcine in aqueous sulphate solution under oxidizing conditions at an oxygen overpressure in the range of from about 50 kPa to about 1500 kPa and at a temperature in the range of from about 100.degree. to about 180.degree. C. to produce an iron-containing residue and a cobalt and nickel containing solution. The residue is separated from the solution, and cobalt and nickel values are recovered from the solution.
    Type: Grant
    Filed: September 15, 1983
    Date of Patent: June 10, 1986
    Assignee: Sherritt Gordon Mines Limited
    Inventors: Donald R. Weir, Derek E. Kerfoot, Michael E. Chalkley
  • Patent number: 4579726
    Abstract: Mercury is removed from sulfuric acid-bearing hot and moist smelting-plant or roasting-plant gases by cooling and scrubbing the hot gases by means of a concentrated sulfuric acid mist in order to sulfatize the mercury and to separate it from the gases. The cooling is carried out by vaporizing so much water or dilute sulfuric acid solution from the gases that the temperature of the gas drops to below the dew point, in order to produce a sulfuric acid mist which sulfatizes and washes the mercury, the gases being separated from the mist and directed to the sulfuric acid plant. The process can be carried out by means of nozzles installed in the pipe which feeds hot and moist sulfuric acid-bearing gases into the scrubbing tower of the sulfuric acid plant, water or acid obtained from the scrubbing tower being fed through the nozzles into the feed pipe in the form of a finely-divided mist.
    Type: Grant
    Filed: July 9, 1984
    Date of Patent: April 1, 1986
    Assignee: Outokumou Oy
    Inventors: Aimo M. F. Kuivala, Jaakko O. Leppinen, Jussi K. Poijarvi, Jussi K. Rastas
  • Patent number: 4545963
    Abstract: A process for separately recovering zinc and lead values from zinc and lead containing sulphidic ore which also contains iron comprises subjecting ground ore to a first flotation step to float an initial lead concentrate containing zinc and produce zinc and iron containing tailings. The zinc and iron containing tailings are subjected to a second flotation step to float an initial zinc concentrate containing iron and also produce tailings. The initial zinc concentrate is subjected to a third flotation step to float a further zinc concentrate containing iron and also produce zinc and iron containing tailings. The zinc and iron containing tailings from the third flotation step and at least a lead and zinc containing portion of the initial lead concentrate are leached in a first leach step under oxidizing conditions at a temperature in the range of from about 130.degree. to about 170.degree. C.
    Type: Grant
    Filed: September 26, 1983
    Date of Patent: October 8, 1985
    Assignee: Sherritt Gordon Mines Limited
    Inventors: Donald R. Weir, Ian M. Masters, Barry N. Doyle, Michael E. Chalkley
  • Patent number: 4541993
    Abstract: In the extraction of certain non-ferrous metals from their sulfide ores by a process where these sulfides are converted to water soluble sulfates by roasting, alkali metal carbonate or bicarbonate, especially sodium carbonate, is added to the roaster feed to promote the sulfatization reaction. Ores containing copper, nickel, cobalt or zinc sulfides are concentrated by froth flotation, the concentrate mixed with carbonate or bicarbonate and roasted. The roasted product is mixed with water to separate these metals as soluble sulfates from iron compounds and other solid residue. The sulfate solution is filtered from the solids and the non ferrous metals recovered by precipitation or electrolysis.
    Type: Grant
    Filed: November 21, 1983
    Date of Patent: September 17, 1985
    Assignee: Atlantic Richfield Company
    Inventor: Daniel A. Norrgran
  • Patent number: 4510028
    Abstract: A process for recovering zinc from material containing zinc ferrite includes leaching the ferrite containing material together with zinc sulphide containing material in a leach step, with the relative amounts of ferrite material and zinc sulphide material being such that the zinc present as zinc ferrite is a minor proportion of the total zinc content of the ferrite material and the zinc sulphide material. The leach step is carried out in aqueous sulphuric acid solution at elevated pressure under oxidizing conditions and at a temperature above the melting point of sulphur, with the sulphuric acid to zinc molar ratio being less than about 1.2:1, to cause dissolution of a substantial amount of zinc from the ferrite material and from the sulphide material.
    Type: Grant
    Filed: June 28, 1983
    Date of Patent: April 9, 1985
    Assignee: Sherritt Gordon Mines Limited
    Inventors: Gerald L. Bolton, Donald R. Weir
  • Patent number: 4441993
    Abstract: A process for recovering metallic values by putting the values into solution and separating undesired mineral matter from the solution using countercurrent flotation is provided. The process involves leaching metallic values from host rock, conditioning the resultant ore pulp with the required reagents to achieve selective flotation of mineral matter in the metallic values solution, introducing the conditioned ore pulp into flotation cells, along with counterflow of solution from an immediately subsequent flotation step, wherein simultaneous washing and flotation is achieved, and the mineral matter is removed leaving a solution of the metallic values. The resultant mineral matter froth product is subjected to subsequent stages of flotation and simultaneous washing with counterflow of solution removed from each subsequent stage of flotation, water and/or barren solution being used for washing in the final flotation stage.
    Type: Grant
    Filed: May 3, 1979
    Date of Patent: April 10, 1984
    Assignee: Fluor Corporation
    Inventor: Frank P. Howald
  • Patent number: 4440569
    Abstract: A process for recovering zinc from zinc containing sulphidic material which also contains iron together with lead and/or silver includes leaching the material under oxidizing conditions at a temperature in the range of from about 130.degree. to about 170.degree. C. in aqueous sulphuric acid solution with a stoichiometric excess of sulphuric acid relative to the zinc content of the material of from about 40 to about 100% to produce an undissolved residue containing a major proportion of lead and/or silver and a leach solution containing a major proportion of the zinc and iron. The residue is separated from the leach solution and treated to recover lead and/or silver values. The leach solution is treated to recover zinc by feeding the solution to another process in which zinc-containing material is treated to recover zinc and which includes an iron-precipitation step.
    Type: Grant
    Filed: February 22, 1983
    Date of Patent: April 3, 1984
    Assignee: Sherritt Gordon Mines Limited
    Inventors: Donald R. Weir, Ian M. Master
  • Patent number: 4401531
    Abstract: The present invention relates to a process for the production of either electrolytic zinc or high purity zinc salts from secondary zinc raw materials which comprises: leaching said raw material in a slightly acid aqueous solution at controlled pH, separating the reaction mixture into a leaching liquor containing the leached zinc and a solid residue which after suitable washing is descarted; directing the zinc-bearing liquor to a solvent extraction facility where it is brought into contact with an organic solution containing organic acids as cationic extraction reagents, by means of which, an ion exchange of zinc by hydrogen ions is achieved, resulting in a zinc loaded organic solution and in an aqueous solution containing the stoichiometric acidity to the extracted zinc; recycling the acid aqueous raffinate to the previous leaching step where it is used as the slightly acid aqueous solution to carry-out the zinc leaching from the raw material; sending the zinc organic extract to a stripping facility where it
    Type: Grant
    Filed: June 30, 1982
    Date of Patent: August 30, 1983
    Inventors: Daniel Martin San Lorenzo, Jose M. Regife Vega, Eduardo D. Nogueira
  • Patent number: 4383979
    Abstract: Zinc, copper and cadmium are recovered from their ferrites by subjecting the ferrites to a sulfuric acid bearing solution in the presence of potassium, sodium or ammonium ions under atmospheric conditions at 80.degree.-105.degree. C. to precipitate the iron present in the ferrites as jarosite, separating at least a portion of the jarosite-bearing solid material from the solution before recycling the solution to a neutral leach, from which a copper and cadmium bearing solution is recovered and to which acid and calcine are also fed, feeding the solid obtained from the neutral leach to the said ferrite treatment stage classifying the solid obtained from the neutral leach into a finer and coarser fraction, feeding the finer fraction to the ferrite treatment stage, comminuting the coarser fraction by grinding, leaching or milling and recycling the comminuted fraction to the process.
    Type: Grant
    Filed: August 26, 1980
    Date of Patent: May 17, 1983
    Assignee: Outokumpu Oy
    Inventors: Jussi K. Rastas, Lars-Goran Bjorkqvist, Raija-Leena Gisler, Simo S. Liukkonen
  • Patent number: 4355009
    Abstract: A hydrometallurgical process is provided for separative treatment of zinc-bearing metallurgical flue dust containing significant amounts of lead, chlorine, and iron. The process is especially suited for extraction of zinc sulfate from blast furnace white dust resulting in the smelting of secondary copper. According to the process, the flue dust is leached in sulfuric acid solution for substantially complete dissolution of soluble constituents, notably zinc, leaving insoluble residue consisting principally of lead oxide. At completion of leaching, pH is selectively adjusted corresponding to the desired extent of subsequent chloride removal. Second, the loaded leach solution is treated for chloride removal wherein chloride ion concentration is substantially and selectively reduced by precipitation of cuprous chloride, cuprous ions being provided by pH regulated reduction of cupric ions.
    Type: Grant
    Filed: May 29, 1980
    Date of Patent: October 19, 1982
    Assignee: Southwire Company
    Inventor: Maxson L. Stewart
  • Patent number: 4305914
    Abstract: A process for precipitating iron as a jarosite from a sulphate solution containing ferric iron, free acid and valuable non-ferrous metals, characterized by cooling the solution; partially neutralizing the free acidity, and then clarifying the solution; heating the clarified solution to a temperature not exceeding the boiling point at atmospheric pressure, in the presence of at least one ion selected from the group consisting of sodium, potassium and ammonium ions, and in the presence of recycled jarosite, and without the addition of any further neutralizing agent, so that substantially all of the ferric iron is precipitated as a jarosite; and separating precipitated jarosite from the solution; thereby producing a jarosite contaminated with only minor amounts of non-ferrous metals, and a solution which may be further processed by established procedures for the recovery of dissolved valuable non-ferrous metals therefrom. The invention also contemplates a dilution step, and recycle of jarosite.
    Type: Grant
    Filed: September 17, 1979
    Date of Patent: December 15, 1981
    Assignee: Electrolytic Zinc Company
    Inventors: Robert V. Pammenter, Curzon J. Haigh
  • Patent number: 4256485
    Abstract: A process for treating sulfide ores to reduce the sulfur content or recover the metal content therefrom comprises the use of enzymatic action to solubilize the sulfur and metal content.A nutrient, such as a saccharide, is used along with yeast spores which feed on the sugar and produce enzymes which act on sulfur in the sulfide ore to cause the sulfur to go into solution and to dissolve those metals which are soluble in strongly acidic solution. Sulfuric acid can be formed from the sulfide ores or from free sulfur by reaction with water, with evolution of hydrogen sulfide gas. Oxidation of at least a portion of the hydrogen sulfide can be achieved to regenerate sulfuric acid.
    Type: Grant
    Filed: October 11, 1979
    Date of Patent: March 17, 1981
    Assignee: Northwest Ecological Research & Development, Inc.
    Inventor: Frederick J. Richardson
  • Patent number: 4192852
    Abstract: A process for precipitating iron as a jarosite from a sulphate solution containing ferric iron, free acid and valuable non-ferrous metals, characterized by cooling the solution; partially neutralizing the free acidity, and then clarifying the solution; heating the clarified solution to a temperature not exceeding the boiling point at atmospheric pressure, in the presence of at least one ion selected from the group consisting of sodium, potassium and ammonium ions, and in the presence of recycled jarosite, and without the addition of any further neutralizing agent, so that substantially all of the ferric iron is precipitated as a jarosite; and separating precipitated jarosite from the solution; thereby producing a jarosite contaminated with only minor amounts of non-ferrous metals, and a solution which may be further processed by established procedures for the recovery of dissolved valuable non-ferrous metals therefrom. The invention also contemplates a dilution step, and recycle of jarosite.
    Type: Grant
    Filed: May 8, 1978
    Date of Patent: March 11, 1980
    Assignee: Electrolytic Zinc Co. of Australasia Limited
    Inventors: Robert V. Pammenter, Curzon J. Haigh
  • Patent number: 4176160
    Abstract: Process for purifying an iron containing zinc sulfate solution which comprises precipitating iron from said solution as a slurry in at least one of the following forms at a pH which is maintained lower than 4: basic sulfate, jarosite or goethite; filtering said slurry on a planar horizontal filter and forming a cake on said planar filter; washing the cake directly on the planar filter with water supplied onto the cake without forming a newslurry with washing water and thus freeing the cake from water soluble zinc and copper compounds promptly before hydrolysis thereof insolubilizes said compounds as basic sulfates, whereby the solid residue in the cake does not contain substantially more insoluble zinc content than it contained in the slurry being fed to the filtration.
    Type: Grant
    Filed: March 6, 1978
    Date of Patent: November 27, 1979
    Assignee: Societe de Prayon
    Inventor: Engelhard Pavonet
  • Patent number: 4156711
    Abstract: Process for removing chlorine from an acidic zinc or cadmium sulphate solon, comprising adding thereto acid of Caro or an ammonium or alkali metal salt thereof.
    Type: Grant
    Filed: November 11, 1977
    Date of Patent: May 29, 1979
    Assignee: Societe des Mines et Fonderies de Zinc de la Vieille Montagne, S.A.
    Inventor: Fernand J. J. Bodson
  • Patent number: 4148862
    Abstract: A hydrometallurgical process for the treatment of a soluble silicate-bearing material for the recovery of its valuable metal content by leaching the silicate-bearing material at an elevated temperature with an aqueous solution of a mineral acid, precipitating silicic acid during the same stage in an easily settling and filtering form, the silicate-bearing material being added at such a rate that its concentration calculated as SiO.sub.2 corresponds to the simultaneously precipitating silicic acid quantity, and by finally separating the solid material from the valuable-metal-bearing solution.
    Type: Grant
    Filed: October 6, 1977
    Date of Patent: April 10, 1979
    Assignee: Outokumou Oy
    Inventors: Sigmund P. Fugleberg, Jaakko T. I. Poijarvi