Subjecting Mixture To Pressure, Vacuum, Or Steam Patents (Class 423/141)
  • Patent number: 4548794
    Abstract: According to the present invention, processes are provided for recovery of nickel, cobalt and like metal values from laterite ores wherein the ores are separated into high and low magnesium containing fractions, the low magnesium fraction is leached with sulfuric acid at elevated temperatures and pressure to solubilize the metal values. The pregnant liquor resulting from the high pressure which also contains solubilized Fe, Al and acid is then contacted with a low magnesium fraction of the ore in a low pressure leach under conditions such that at least some of the acid is neutralized and substantially all of the solubilized Fe and Al is removed as hematite and alunite precipitate.In one embodiment, the pregnant liquor from the high pressure leach and the high magnesium fraction are contacted at atmospheric pressure and a temperature of about 80.degree. C. prior to low pressure leaching. In other embodiments, various process streams are separated by size and otherwise, and recycled to within the processes.
    Type: Grant
    Filed: July 22, 1983
    Date of Patent: October 22, 1985
    Assignee: California Nickel Corporation
    Inventors: E. Harris Lowenhaupt, John E. Litz, Dennis L. Howe
  • Patent number: 4547347
    Abstract: A process wherein nickel in an aqueous stream is recovered as nickel sulfide by precipitation in an autoclave with pressurized hydrogen sulfide in the presence of a large quantity of recycled fine nickel sulfide seed material is improved when operated under continuous conditions by introducing into the autoclave a small, controlled quantity of supplemental seed material designed to maintain the seed surface area within required limits.
    Type: Grant
    Filed: December 2, 1983
    Date of Patent: October 15, 1985
    Assignee: AMAX Inc.
    Inventors: Guy W. Lussiez, Lauren B. Ames
  • Patent number: 4545816
    Abstract: The selective leaching of metal ions from various iron oxide and manganese oxide containing ores employs intermediary solutions. The leaching processes are based upon a redox acid leach step employing stabilized cuprous ions and, in one instance, a combination thereof with ferrous ions. Leaching is conducted at low temperatures, up to about 90.degree. C. and low pressures, up to about 1.5 MPa and at a pH of about 1.5 to 2.5. Nickel and cobalt recoveries from the ores, employing these processes, will usually equal or exceed 90 percent. The intermediary solutions comprise stabilized acidic cuprous ions Cu.sup.+ L wherein L is a stabilizing ligand selected from the group consisting of CO, XRCN and Cl.sup.-, X being --H or --OH and R being aliphatic having from one to about four carbon atoms. In at least one process, ferrous ions are introduced for a separate leaching step.
    Type: Grant
    Filed: June 4, 1984
    Date of Patent: October 8, 1985
    Assignee: The Standard Oil Co.
    Inventor: Alkis S. Rappas
  • Patent number: 4541868
    Abstract: According to the present invention, improved dissolution of nickel and cobalt and thus improved recovery of those desired metal values is achieved by modifying the ore recovery processes wherein sulfuric acid leaching at elevated temperatures is used to dissolve the nickel and cobalt. In particular, according to the present invention, processes are provided wherein the sulfuric acid and ore are contacted at substantially ambient temperature prior to subsequent heating to attain the elevated temperatures of the sulfuric acid leach. Practice of the present invention has been found to result in improved metal value recovery.
    Type: Grant
    Filed: July 22, 1983
    Date of Patent: September 17, 1985
    Assignee: California Nickel Corporation
    Inventors: E. Harris Lowenhaupt, John E. Litz, Dennis L. Hoe
  • Patent number: 4541994
    Abstract: According to the present invention, Ni- and Co-rich, low Mg fines may be advantageously separated from the coarse fractions of lateritic ores by atmospheric or low pressure leaching. In particular, the process of the present invention comprises contacting a lateritic ore or ore fraction at temperatures from about 20.degree. C. to about 200.degree. C. and pressures from about atmospheric to about 200 psig with an aqueous acid solution to form a leach liquor, a leach residue and a fines fraction. The fines fraction which can be separated from the residue with the leach liquor by conventional means such as cycloning is found to be richer in Ni and Co and lower than the remainder of the residue.
    Type: Grant
    Filed: July 22, 1983
    Date of Patent: September 17, 1985
    Assignee: California Nickel Corporation
    Inventors: E. Harris Lowenhaupt, John E. Litz, Dennis L. Howe
  • Patent number: 4457897
    Abstract: A hydrometallurgical process for the recovery of cobalt from cobaltite-pyrite concentrates containing substantial amounts of cobalt, arsenic, iron and sulphur is disclosed. The hydrometallurgical process comprises pressure leaching of the cobaltite-pyrite concentrates with a sodium chloride or sodium sulphate solution at a temperature in the range of 130.degree.-160.degree. C. and under oxygen partial pressures in the range of 75-200 psi to solubilize at least 90% of the cobalt content, while simultaneously precipitating most of the iron and arsenic as jarosite and ferric arsenate.
    Type: Grant
    Filed: September 28, 1982
    Date of Patent: July 3, 1984
    Assignee: Noranda Mines Limited
    Inventors: Robert W. Stanley, Serge Monette, Bryn Harris
  • Patent number: 4415542
    Abstract: The scaling of autoclave and leaching-equipment surfaces during the high pressure leaching of nickeliferous oxide and silicate ores is controlled during leaching to favor the formation of scale containing substantial amounts of magnesium sulfate that is more easily removed by chemical dissolution using water or dilute sulfuric acid at temperatures ranging from about 50.degree. C. to 250.degree. C. than scale containing substantial amounts of alunite.
    Type: Grant
    Filed: June 21, 1982
    Date of Patent: November 15, 1983
    Assignee: Compagne Francaise D'Entreprises Minieres, Metallurgiques et D'Investissements
    Inventors: Paul B. Queneau, Robert E. Doane, Mark H. Berggren, Mark W. Cooperrider
  • Patent number: 4402860
    Abstract: An improved process for de-cobaltizing the primary product of an oxo synthesis is disclosed wherein the primary product is contacted with steam introduced into a vessel to which the primary oxo product is introduced but initially maintained in out of contact relationship to such product by a cooling medium whereby heat transfer from the steam to the primary product is initially avoided. The primary product and steam are fed to a cylindrical reactor having a conical base, and after the steam has risen 1/2 to 2/3 of the height of the conical base it comes in contact with the primary product whose liquid level height in the vessel is maintained at one to two times the vessel's diameter. An apparatus for performing such process is also disclosed.
    Type: Grant
    Filed: August 25, 1981
    Date of Patent: September 6, 1983
    Assignee: Ruhrchemie Aktiengesellschaft
    Inventors: Josef Meis, Volkmar Schmidt, Hans Tummes, Joachim Much
  • Patent number: 4399109
    Abstract: A method is provided for inhibiting the formation of silica scale on flash-pot surfaces during the multi-stage flashing of sulfuric acid pressure-leach slurry obtained following the continuous autoclave leaching of nickel lateritic ore at elevated temperature and pressure during which silica is dissolved, wherein the leach slurry is subjected to a high-temperature flash stage such that the slurry at the flash temperature is supersaturated in soluble silica, and wherein the slurry is thereafter subjected to at least one additional flash at an intermediate-temperature flash stage at which silica precipitates and tends to form a scale accompanied by a decrease in said supersaturation.
    Type: Grant
    Filed: February 26, 1982
    Date of Patent: August 16, 1983
    Assignee: Compagnie Francaise d'Entreprises Minieres, Metallurgiques et d'Investissements
    Inventors: Ralph K. Iler, Paul B. Queneau, Mark W. Cooperrider
  • Patent number: 4329169
    Abstract: Fine particle size cobalt metal powder is prepared absent tailings by heating an aqueous solution of soluble cobaltic ammine halide to a temperature of at least about 120 degrees centigrade for a sufficient period of time to decompose said cobaltic ammine halide and form a cobalt containing precipitate. The precipitate is separated from the solution and reduced in a reducing atmosphere to produce fine metal cobalt powder.
    Type: Grant
    Filed: August 18, 1980
    Date of Patent: May 11, 1982
    Assignee: GTE Products Corporation
    Inventors: Richard G. W. Gingerich, Richard A. Scheithauer
  • Patent number: 4282190
    Abstract: A process for the removal of iron and aluminum values from acidic solutions thereof with zinc chloride wherein the solution is subjected to pressure hydrolysis to precipitate the iron and aluminum as the hydroxides or oxide hydrates, and then the precipitate is removed and washed. Zinc chlorides which are particularly free from iron and aluminum can be rapidly and easily obtained with this process.
    Type: Grant
    Filed: November 8, 1979
    Date of Patent: August 4, 1981
    Assignee: Th. Goldschmidt AG
    Inventors: Wolfgang Muller, Lothar Witzke
  • Patent number: 4222999
    Abstract: A process for purifying copper sulfate solution by converting contained hexavalent selenium to tetravalent selenium which is amenable to removal from solution by heating and maintaining the solution at a temperature in the range of about 135.degree. to 220.degree. C. under a non-oxidizing atmosphere in the presence of bivalent iron. The converted selenium is removed from the solution either by co-precipitation with ferrous iron oxidized and hydrolyzed to ferric oxide at a temperature in the range of 135.degree. to 220.degree. C. and under an oxygen pressure of about 140 to 450 kPa or by cementation with a metal powder at a temperature in the range of about 25.degree. to 85.degree. C. at about ambient pressure under a non-oxidizing atmosphere.
    Type: Grant
    Filed: August 14, 1978
    Date of Patent: September 16, 1980
    Assignees: Sherritt Gordon Mines Limited, Cominco Ltd.
    Inventors: Donald R. Weir, Eva A. Vosahlo, Roman M. Genik-Sas-Berezowsky
  • Patent number: 4193970
    Abstract: A process for precipitation of iron as a jarosite compound from sulfate solution in which said solution fed sequentially through a plurality of reaction zones for oxidation and hydrolysis of ferrous sulfate in the presence of alkali-metal or ammonium ions for jarosite precipitation and simultaneous generation of sulfuric acid is subjected to a "reverse temperature profile", i.e., higher temperature in the last reaction zone than in the first reaction zone, by injection of steam to the last reaction zone.
    Type: Grant
    Filed: August 14, 1978
    Date of Patent: March 18, 1980
    Assignees: Cominco Ltd., Sherritt Gordon Mines Limited
    Inventors: Verner B. Sefton, Godefridus M. Swinkels, Charles R. Kirby, Roman M. Genik-Sas-Berezowsky
  • Patent number: 4175110
    Abstract: Titanium metal values are recovered from a titanium bearing source such as an ilmenite ore by subjecting the source to a reductive roast and leaching the reduced source with a halogen-containing compound. Following this the soluble metal halides are separated from gangue and the pregnant leach liquor if treated with an iron oxide such as ferric oxide to precipitate titanium dioxide. The nucleation of the titanium dioxide may be improved by using a large excess of ferric oxide in the precipitation step. The improvement will thus result in an increased yield of the desired titanium dioxide.
    Type: Grant
    Filed: August 22, 1978
    Date of Patent: November 20, 1979
    Assignee: UOP Inc.
    Inventor: William K. Tolley
  • Patent number: 4135918
    Abstract: A sulfide containing copper and one or more of iron, nickel and cobalt, is dead-roasted at a temperature of 750.degree. C or above, then subjected to a pressure leach under reducing conditions to produce elemental copper and an aqueous solution of the other metals.
    Type: Grant
    Filed: March 2, 1978
    Date of Patent: January 23, 1979
    Assignee: The International Nickel Company, Inc.
    Inventors: Victor A. Ettel, Eric A. P. Devuyst, Ramamritham Sridhar, Charles E. O'Neill
  • Patent number: 4127989
    Abstract: A process for separating and recovering metal values and salts from brine, such as brine produced from a subterranean geothermal reservoir, in which the brine is pressurized to above the bubble point pressure and thereafter a precipitating agent, such as a soluble sulfide, is added to the brine to form insoluble metal sulfide precipitates. The precipitates are separated from the brine while maintaining the brine at a pressure above the bubble point pressure, and the hot brine is subsequently utilized to derive energy therefrom. The brine effluent after such energy derivation and the precipitate are optionally processed to primarily recover saleable salts and metal values, respectively.
    Type: Grant
    Filed: January 25, 1978
    Date of Patent: December 5, 1978
    Assignee: Union Oil Company of California
    Inventor: Grant A. Mickelson
  • Patent number: 4115106
    Abstract: A method for producing metallic oxide compounds having a spinel type structure by reacting the beta form of hydrated iron oxide with a salt of an effective metallic cation.
    Type: Grant
    Filed: October 20, 1976
    Date of Patent: September 19, 1978
    Assignee: National Standard Company
    Inventors: Cloyd A. Snavely, John A. Smith
  • Patent number: 4110400
    Abstract: A method for efficiently precipitating nickel sulfide from an acidic nickel sulfate solution having a pH between 1.5 and 4, containing about 1 to 40 gpl nickel, optionally containing cobalt, and containing sufficient inert soluble sulfate salt to buffer the solution during the precipitation of nickel sulfide at relatively low temperature and pressure.
    Type: Grant
    Filed: August 1, 1977
    Date of Patent: August 29, 1978
    Assignee: Amax Inc.
    Inventors: Mahesh C. Jha, Gordon R. Wicker, Gustavo A. Meyer
  • Patent number: 4107265
    Abstract: A process for treating a residue from the sulfuric acid leaching of roasted zinc blende, comprising(a) leaching the residue in a single stage with sulfuric acid and a metal sulfide supplied in a quantity sufficient for transforming the iron into divalent iron, the temperature being maintained between about 60.degree. C and the boiling point,(b) heating the mass to a temperature above the melting point of sulfur, separating a first fine-grained residue of low zinc and iron contents and high lead content, and separating a coarse-grained residue containing sulfur, compounds of iron and any excess metal sulfide from (a),(c) adjusting the pH of the residual solution to at most about 2, at a temperature between about 80.degree.
    Type: Grant
    Filed: May 25, 1977
    Date of Patent: August 15, 1978
    Assignee: Metallgesellschaft Aktiengesellschaft
    Inventors: Adolf VON Ropenack, Volker Wiegand, Gunter Smykalla
  • Patent number: 4055631
    Abstract: A process for the production of high purity iron sulfate monohydrate from an iron sulfide mineral feed involving a leaching, purification, crystallization and dehydration procedure to recover a solution of iron sulfate containing iron sulfate polyhydrates and to convert iron sulfate polyhydrates in a series of steps to monohydrate crystals. The process can be also advantageously used with iron sulfide feed materials containing non-ferrous metals with full separation and recovery of the non-ferrous metals in the sulfide residue of the leaching and purification process of this invention. It can also be used for the purification of industrial pickle liquor solutions which can be treated with the iron sulfide mineral feed in this process leach circuit with full recovery of the ferrous and non-ferrous metals content of these solutions.
    Type: Grant
    Filed: December 15, 1975
    Date of Patent: October 25, 1977
    Assignee: The Hanna Mining Company
    Inventors: Patrick J. McGauley, Abraham A. Dor
  • Patent number: 4038361
    Abstract: The ore is subjected to nitric acid leaching and the leach solution is heated to a temperature at which one of the additional sulfur and iron values is selectively insolubilized with respect to the solution, while the other is maintained in solution for subsequent separation from the liquor after the insolubles have been removed and the liquor has been neutralized. In addition, in one embodiment of the invention the heating and acid neutralization steps are controlled within certain prescribed limits to make it possible to remove the metals from the liquor by solvent extraction without the problem of lasting precipitates forming in the liquor and fouling the extraction process. Where there is a sizable amount of dissolved iron in the liquor, the liquor may be subjected to autoclaving at a temperature above about 149.degree. C (300.degree. F) to precipitate the iron as the oxide thereof. This effect is possible even where the liquor is high in sulfate concentration.
    Type: Grant
    Filed: March 17, 1976
    Date of Patent: July 26, 1977
    Assignee: International Ore Technology, Inc.
    Inventor: John G. Posel
  • Patent number: 3992270
    Abstract: A method and apparatus for reclaiming nickel values from a nickeliferous alloy in which the nickeliferous alloy is subjected to nitric lixiviation and the nickel values are recovered from the resulting nickel nitrate solution.
    Type: Grant
    Filed: January 29, 1975
    Date of Patent: November 16, 1976
    Assignee: Imetal
    Inventors: Robert Lemarinel, Jean-Michel Demarthe, Louis Gandon
  • Patent number: 3991159
    Abstract: The pregnant solution obtained from high pressure and high temperature leaching of nickel-cobalt bearing low magnesium oxidic ores is neutralized at high temperature and pressure by coordinating the leaching of the low magnesium ores with the leaching of nickel-cobalt bearing high magnesium ores, the leach slurry from said low magnesium ore being neutralized by mixing it with said high magnesium ore which is simultaneously leached with said solution to produce a final pregnant solution from which metal values are subsequently recovered.
    Type: Grant
    Filed: January 9, 1975
    Date of Patent: November 9, 1976
    Assignee: Amax Inc.
    Inventors: Paul B. Queneau, Eddie C. Chou
  • Patent number: 3981962
    Abstract: Complex sulfide ores or concentrates are decomposed by treatment with a combination of chlorine and oxygen, the amount of chlorine being limited to that necessary to convert sulfides of the desired metals, such as zinc, lead, copper, cadmium, silver, nickel and cobalt to chlorides.
    Type: Grant
    Filed: June 30, 1975
    Date of Patent: September 21, 1976
    Assignee: The United States of America as represented by the Secretary of the Interior
    Inventors: Gary A. Smyres, Philip R. Haskett, Bernard J. Scheiner, Roald E. Lindstrom
  • Patent number: 3976743
    Abstract: A process for the treatment of zinc plant residue formed on leaching zinc calcine with sulphuric acid in which the residue is leached in a first leaching step with a sulphuric acid solution at atmospheric pressure, and a temperature above about 60.degree.C, in the presence of excess zinc sulphide reductant whereby ferric iron in the residue is reduced to the ferrous state, thereby forming a zinc sulphate solution containing excess acid, ferrous iron and other dissolved impurities such as germanium, indium, gallium, antimony and arsenic nd a mixture of solids containing undigested zinc residue, lead residue, and unreacted zinc sulphide. Clarified solution is separated, preferably by thickening, from the mixture of solids. The mixture of solids is leached in a second residue leaching step at atmospheric pressure and at a temperature above about 60.degree.
    Type: Grant
    Filed: August 5, 1975
    Date of Patent: August 24, 1976
    Assignee: Cominco Ltd.
    Inventors: Louis Landucci, Donald Roderick McKay, Ernest George Parker
  • Patent number: 3965239
    Abstract: The ore is subjected to nitric acid leaching and the leach solution is heated to a temperature at which one of the additional sulfur and iron values is selectively insolubilized with respect to the solution, while the other is maintained in solution for subsequent separation from the liquor after the insolubles have been removed and the liquor has been neutralized. In addition, in one embodiment of the invention the heating and acid neutralization steps are controlled within certain prescribed limits to make it possible to remove the metals from the liquor by solvent extraction without the problem of lasting precipitates forming in the liquor and fouling the extraction process. Where there is a sizable amount of dissolved iron in the liquor, the liquor may be subjected to autoclaving at a temperature above about 149.degree.C (300.degree.F) to precipitate the iron as the oxide thereof. This effect is possible even where the liquor is high in sulfate concentration.
    Type: Grant
    Filed: April 18, 1975
    Date of Patent: June 22, 1976
    Assignee: International Ore Technology, Inc.
    Inventor: John G. Posel