Abstract: The present application discloses metallophores that complex soluble gold and generate solid gold forms, including gold nanoparticles. In an embodiment, the metallophores are microbial metabolites isolated from organisms that are resistant to gold, or are analogs thereof. Methods of using the metallophores to extract and detect gold, along with detectors comprising the metallophores are disclosed.

Abstract: A pelletizing process, having two distinct serial stages. In the first stage, crude (or green) pellets of a given ore, or a mixture of ores (such as iron ore, manganese ore and other minerals), are produced, while in the second stage, a Device for Improvement of Crude Pellets, is used. The Device includes a slightly elastic and smooth surface, with reduced attrition rate, that may be striated, and that, encircled in itself, forms a cylindrical geometric hollow figure supported by a metallic structure, also cylindrical, with the set forming a finishing drum. The Device rotates with an inner and continuous charge of ore pellets, and can rearrange the structure of such pellets, improving their physical quality: compressive strength, sphericity and surface finishing, and assimilate fines generated during previous processes. This device allows application of diverse materials to the pellets to add required extra properties per specificities of subsequent industrial processes.

Abstract: The present invention is directed to provide a production method for carbonaceous material-containing metal oxide briquettes, capable of ensuring sufficient strength of briquettes while using a metal oxide material containing a large amount of fine particles, such as steel mill dust. This method comprises a mixing step of mixing a metal oxide material A containing a large amount of fine particles with a carbonaceous material B in a mixer 15, to form a powdery mixture E, a compacting step of compacting the powdery mixture E using a briquette machine 17 to form compacts F, a classifying step of classifying the compacts F into an oversize fraction G and an undersize fraction H, using a sieve 18, and collecting the oversize fraction G as product briquettes, and a compact circulating step of returning a part of the compacts F to the mixer 15 or the briquette machine 17, as a recycle material.

Abstract: The present invention relates to a process for preparing, starting from a slag material, a filler for construction materials which contain bitumen or a hydraulic binding agent. The slag used to prepare the filler contains ?-dicalcium silicate. The process comprises the step of removing from the slag material a finer fraction formed by particles of a size between 0 and at least 0.75 mm so as to reduce the ?-dicalcium silicate content of the slag material; and the step of finely milling at least a portion of the remaining coarser fraction of the slag to obtain the filler. The invention also relates to the obtained filler, to the use thereof for preparing construction materials and to concrete or mortar compositions and asphalt compositions containing the filler.

Abstract: A process for converting organic wastes into a reducing agent-coke substitute (“RACS”). More specifically, a process for producing a reducing agent-coke substitute from a mixed waste material containing economically recoverable metals and organic based materials is described. In accordance with one aspect, the process comprises blending mixed waste material with a metal-containing smelter by-product, processing the blend of mixed waste material and smelter by-product through a heated mixing device to convert the blend into reducing agent-coke substitute.

Abstract: A method for recycling steelmaking dusts has a granulating step of mixing steelmaking dusts, containing as a principal component iron and oxides thereof produced during the steelmaking in a melting furnace, with a powder containing carbon as a principal component and granulating the resultant mixture to provide mixed granules, a water impregnating step of immersing the mixed granules in a water to allow them to be impregnated with the water, a solidifying step of molding the water impregnated, mixed granules under pressure within a mold assembly to provide a solid body of the steelmaking dusts, a step of transporting the solid body of the steelmaking dusts as a raw material to be charged into the melting furnace, an enhancing step of increasing the concentration of zinc in the dusts, and a dezincing step of dezincing the dusts during a period from acquisition of the steelmaking dusts out of the melting furnace to the solidifying step.

Abstract: A manufacture method of briquette for use as metal stock is provided which increases the efficiency of drying porous masses so as to shorten a drying time, and which provides a simplified constitution for reducing an installation area of a system and for reducing the running cost and initial cost of the system. The porous masses are formed by compression molding a recyclable material containing metallic powder. The compression molded porous masses are fed into a tubular member, into which hot air is blown for drying the porous masses.

Abstract: Aqueous dispersion containing a metal oxide powder with a fine fraction and a coarse fraction, in which—the metal oxide powder is silicon dioxide, aluminum oxide, titanium dioxide, zirconium dioxide, cerium oxide or a mixed oxide of two or more of the aforementioned metal oxides,—the fine fraction is present in aggregated form and has a mean aggregate diameter in the dispersion of less than 200 nm,—the coarse fraction consists of particles with a mean diameter of 1 to 20 ?m, —the ratio of fine fraction to coarse fraction is 2:98 to 30:70, and—the content of metal oxide powder is 50 to 85 wt. %, referred to the total amount of the dispersion. The aqueous dispersion is produced by a process comprising the steps:—production of a fine fraction dispersion by dispersing the pulverulent fine fraction in water by means of an energy input of at least 200 KJ/m3?, and—introducing the coarse fraction in the form of a powder into the fine fraction dispersion under dispersing conditions at a low energy input.

Abstract: A formed article for making alloying additions to metal melts includes particles of at least one master alloy and a binder material binding the particles of the master alloy in the formed article. The binder material changes form and frees the master alloy particles when the formed article is heated to a predetermined temperature, preferably a temperature greater than 500° F. A method for making an alloy also is provided. The method includes preparing a melt comprising a predetermined quantity of a master alloy wherein the master alloy is added to the melt or the melt starting materials in the form of particles of the master alloy bound into at least one formed article by a binder material that decomposes at a predetermined temperature, preferably a temperature greater than 500° F., and releases the particles of master alloy.

Abstract: The present invention relates to an apparatus for manufacturing compacted irons and an apparatus for manufacturing molten irons using the same. The apparatus for manufacturing compacted irons according to the present invention includes a charging hopper into which reduced materials containing fine reduced irons are charged, screw feeders installed inside the charging hopper to make an acute angle with a vertical direction and discharging the reduced materials containing fine reduced irons which enter into the charging hopper, and a couple of rolls separated from each other to form a gap between the rolls. The couple of rolls compact the reduced materials containing fine reduced irons discharged from the charging hopper by the screw feeders and manufacture compacted irons. Each screw feeders is arranged side by side along an axis direction of the couple of rolls and an extension of the center axis of each screw feeder passes through the gap.

Abstract: Acid mine drainage is treated to form a wet meal-containing precipitate. Such wet metal containing precipitate is dried and processed to form a powder which contains one or more metals. The powder (alone or in combination with other metal powders or other additives) is then compressed (e.g., pressed in a die, rolled, extruded) and sintered to form a desired sintered metal article. In some embodiments, the sintered metal article may be subjected to one or more secondary processes (e.g., oil impregnation, resin impregnation, metal infiltration, copper infiltration, heat treating, steam oxidizing, plating and secondary machining) to alter the strength, configuration or other property of the pressed metal article.

Abstract: An approach to synthesizing and assembling nanoparticles into discrete, size-tunable, pre-designed architectures is realized in a single synthetic/process step.

Abstract: The structural integrity of a metal powder body during heat treatment is enhanced by the in situ formation of metal nanoparticles. The nanoparticles bond to one another and to the metal powder particles of the powder body during heat treatment to provide strength to the powder body prior to the operation of the physical phenomena which transform the powder body into a coherent article. The precursor or precursors from which the nanoparticles are derived are preferably metal salts which are added to the powder or powder body in the form of a solution. The use of conventional binders is optional.

Abstract: A braze formulation includes a novel promoter and a metal filler. The promoter includes a blend of potassium tetrafluoroaluminate and potassium tetrafluoroborate. The braze may be used for repairing cracks in a substrate. The braze has a low melt point, removes oxides from within cracks and has improved penetration into cracks for repair.

Abstract: A method is provided for passivating sulfidic iron-containing rock comprising contacting sulfidic iron-containing rock with one or more members of the group consisting of magnesium oxide, magnesium hydroxide, magnesium chloride, magnesium nitrate and magnesium carbonate, thereby reducing the acid generation potential of rock.

Abstract: A zinc dust containing slurry is prepared by mixing 7.8 weight percent of a solution of a sodium silicate. 72.0 weight percent of the demineralized water, 0.2 weight percent of a surface active agent and 20 weight percent of zinc dust. A waterborne coating material is obtained by mixing and stirring 25 parts by weight of a lithium silicate into 100 parts by weight of the zinc dust containing slurry.

Abstract: A method of producing reduced iron pellets including reducing raw material pellets to obtain reduced iron pellets, and rolling the reduced iron pellets at a temperature ranging between 800 and 1200° C. sufficiently such that the reduced iron pellets undergo sintering.

Abstract: The present invention is directed to additives for coal-fired furnaces, particularly furnaces using a layer of slag to capture coal particles for combustion. The additive(s) include iron, mineralizer(s), handling aid(s), flow aid(s), and/or abrasive material(s). The iron and mineralizers can lower the melting temperature of ash in low-iron, high alkali coals, leading to improved furnace performance.

Abstract: The present invention provides a method and facility for preventing crumbling and powderization of green pellets when producing high strength green pellets using a powder feedstock and using the pellets in a rotary hearth reducing furnace and for efficiently reducing the same. It comprises kneading by a kneader 5 a feedstock of a powder of a fine particle size (20 to 80 wt % having size of not more than 10 &mgr;m) including a metal oxide and carbon-bearing powder fed from a feed storage tank 1 and producing green pellets by a pan type pelletized 7. The green pellets are screened by a pellet screen 9, then dried by a pellet dryer 11 and reduced by firing in a rotary hearth reducing furnace 13. At that time, the green pellets are continuously conveyed to prevent crumbling.

Abstract: Shaped bodies containing particulate iron materials, such as cast pellets, briquettes and the like, with sufficient strength to withstand temperatures of up to at least 1000° C. can be obtained by using a fully hydrated high-alumina cement as the binder. The strength of the pellets at elevated temperatures can be further enhanced by adding small amounts of bentonite, silica fume or other suitable supplementary cementing materials, and super plasticizer. The iron particulate materials, typically having a size range of from about 0.01 mm to 6 mm, include ore fines, sinter fines, BOF and EAF dusts, mill scale, and the like. Powdered carbonaceous material, such as ground coal or coke, may also be added to the pellets. The shaped bodies are suitable for use in blast furnaces, basic oxygen furnaces, and in DRI processes.

Abstract: Pellets incorporated with a carbonaceous material of the present invention contain a carbonaceous material and iron ore mainly composed of iron oxide. The maximum fluidity of the carbonaceous material in softening and melting, and the ratio of iron oxide particles of 10 &mgr;m or smaller in the iron ore are within the range above a line which connects in turn points A, B and C shown in FIG. 1, including the line. This permits the production of pellets incorporated with a carbonaceous material having excellent thermal conductivity and high strength. Reduction of the pellets incorporated with a carbonaceous material produces reduced iron having high strength after reduction and a low fines ratio with improved productivity.

Abstract: A zinc dust containing slurry is prepared by mixing 7.8 weight percent of a solution of a sodium silicate, 72.0 weight percent of the demineralized water, 0.2 weight percent of a surface active agent and 20 weight percent of zinc dust. A water coating material is obtained by mixing and stirring 25 weight percent of a lithium silicate into 100 weight percent of the zinc dust containing slurry.

Abstract: A method is provided by which rice hull ash is pelletized for use in steelmaking The rice hull ash is blended with lime or dolime, and also with a mixture of water and molasses. This generates heat as the lime and water react to form lime hydroxide, a known binder. The heat thus generated reduces the energy required for drying the pellets.

Abstract: A process for making a mineral oxide concentrate useful as a flocculent, coagulant and/or disinfectant for the treatment of water and wastewater comprises extracting minerals from a natural mineral deposit rich in aluminum, magnesium, potassium and iron; reducing the particle size of the extracted material to a fine particle size, followed by heat treating the resulting mineral-rich material in air to produce a controlled expansion of the material and to oxidize essentially all organic constituents and to evaporate all water, leaving a mass of expanded dried mineral oxide-rich material containing oxides of aluminum, magnesium, potassium and iron. The expanded oxide-rich material is dissolved in a liquid carrier, preferably an alkaline solution, but an acidic solution also can be used, to produce a concentrate in which the mineral oxides are available and useful for said water and wastewater treatment.

Abstract: Pellets incorporated with a carbonaceous material of the present invention contain a carbonaceous material and iron ore mainly composed of iron oxide. The maximum fluidity of the carbonaceous material in softening and melting, and the ratio of iron oxide particles of 10 &mgr;m or smaller in the iron ore are within the range above a line which connects in turn points A, B and C shown in FIG. 1, including the line. This permits the production of pellets incorporated with a carbonaceous material having excellent thermal conductivity and high strength. Reduction of the pellets incorporated with a carbonaceous material produces reduced iron having high strength after reduction and a low fines ratio with improved productivity.

Abstract: To produce a hydrogen absorbing alloy powder which is an aggregate of alloy particles each including a metal matrix and added-components, an aggregate of metal matrix particles and an aggregate of added-component particles are used, and mechanical alloying is carried out. In this case, the relationship between the particle size D of the metal matrix particles and the particle size d of the added-component particles is set at d≦D/6. Thus, the milling time can be shortened remarkably.

Abstract: A method of solidifying a steel-making slag is performed by subjecting a mixture of a steel-making slag containing at least about 50% by weight of a powdery steel-making slag having a particle size not greater than about 5 mm and a substance containing at least about 30% by weight of SiO2 (e.g., a fly ash and/or the fine powder of a granulated blast furnace slag) to a hydration reaction. The resulting solidified material contains at least about 20% of a tobermorite phase, has high strength and is suitable as an inorganic material useful as a roadbed material, building and civil engineering materials, etc.

Abstract: Pellets incorporated with a carbonaceous material of the present invention contain a carbonaceous material and iron ore mainly composed of iron oxide. The maximum fluidity of the carbonaceous material in softening and melting, and the ratio of iron oxide particles of 10 &mgr;m or smaller in the iron ore are within the range above a line which connects in turn points A, B and C shown in FIG. 1, including the line. This permits the production of pellets incorporated with a carbonaceous material having excellent thermal conductivity and high strength. Reduction of the pellets incorporated with a carbonaceous material produces reduced iron having high strength after reduction and a low fines ratio with improved productivity.

Abstract: A method of producing raw material pellets, including forming pellets from a mixture of an iron oxide powder, a coal powder and a binder material after adding adjusting water to the mixture, and drying the pellets, wherein the binder material comprises at least one of tar and at least one of carboxymethylcellulose and polyvinylalcohol.

Abstract: A cored wire continuously formed by continuously inserting an extruded core inside a continuously roll formed sheath, the peripheral edges of the roll formed sheath joined by a continuous lock seam. Inspection of the partially formed lock seam at a designated process step serves to warn the user of malformed or defective lock seam portions in the finished cored wire.

Abstract: A flux which contains irreversibly dehydrated K2AlF5, for soldering light metal materials, in particular aluminum. The flux has the advantages of forming a very uniform flux coating on the workpiece or workpieces to be soldered and exhibiting outstanding flow of the solder. An appropriate soldering process, an aqueous flux suspension and preparation processes for the flux are also disclosed.

Abstract: The present invention provides a method of diffusion bonding a first article containing a thermally activated expansion agent to a second article. The first article and the second article are placed adjacent to each other at a bonding area. The first article and the second article are constrained such that contact is maintained between the first article and the second article at the bonding area. The constrained articles are then heated at a temperature that causes the first article to expand, creating pressure between the articles at the bonding area.

Abstract: A cored wire continuously formed by continuously inserting an extruded core inside a continuously roll formed sheath, the peripheral edges of the roll formed sheath joined by a continuous lock seam. Inspection of the partially formed lock seam at a designated process step serves to warn the user of malformed or defective lock seam portions in the finished cored wire.

Abstract: The invention concerns amphiphilic compounds of general formula (I) ##STR1## with at least two hydrophilic and at least two hydrophobic groups based on diacarboxylic acid diamides. The amphiphilic compounds according to the invention are mostly surface-active and are suitable for use as emulsifiers, demulsifiers, detergents, dispergents and hydrotropic agents in industry and households, for example, in the treatment of metals, ore processing, surface finishing, washing, cleaning, cosmetics, medicine and food processing and preparation.

Abstract: A grinding aid and an enhanced roll press method of grinding granulated blast-furnace slag by treating the slag feed of the roll press with from about 0.002 to 0.2 weight percent of polyacrylic acid or its alkali metal salt in combination with up to about 4 weight percent water.

Abstract: Thermally shock stable bonded solid materials are formed by mixing a solid mineral or inorganic material in an aqueous medium with a lignosulfonate, treating the aqueous medium with a metal ion- based complexing agent (such as lime), with application of heat sufficient to maintain the lignosulfonate in fluid form, so as to produce an intimate mix of saturated slaked lime with lignosulfonate and the mineral or inorganic material, and thoroughly mixing the resulting substantially dry material with dry urea (or a derivative thereof) so as to cause the mix to agglomerate, preferably followed by shaping the agglomerates by briquetting or the like.

Abstract: In a method for processing solid residues from refuse incineration plants the slag is melted and heavy metals from the melt (16) are separated for reutilization. The slag is directly transferred from the refuse incineration plant into a first heating chamber (2) and melted there under oxidizing conditions. The melt (16) produced therefrom is transferred to a second heating chamber (3), in which the heavy metal compounds are reduced to their metallic form. Furthermore, additional finely divided residues, such as fly ash, boiler ash and filter dust, are introduced into the second heating chamber (3) via a hollow graphite electrode (19). The melt (16) is then passed on to a third heating chamber (4), in which the residual readily volatile metals are vaporized and the residual non-volatile metals are sedimented. The essentially heavy-metal-free melt is then cooled to form vitreous granules.

Abstract: An improved method and apparatus is provided for the production of copper using a solvent extraction electrowinning process. Process streams formed during the process containing entrained liquids are fed to a cyclone to remove either organic extractant or water (aqueous solutions) from the stream. A raffinate stream fed to a cyclone removes entrained organic phase which organic phase may be recycled to the process. The separated raffinate stream would then typically be recycled to the copper ore leach step to form a pregnant leach solution without the loss of organic solvent and/or the environmental concerns associated with entrained solvent. In a preferred new process, mixers, preferably inline, are used in conjunction with cyclones to provide a solvent extraction electrowinning process which is continuous and efficient and the use of conventional mixers, and particularly settlers, are eliminated.

Abstract: A method of stabilizing a fluidized bed in a fluidized bed roasting process for metal sulphide concentrate comprises the step of controlling the particle size distribution of the particulate material in the bed so that a minimum amount of no less than about 30% of the concentrate falls in a size range of from about 100 to about 420 microns. The minimum amount preferably falls in the range of from about 35% to about 40%. In one embodiment of the invention the particle size distribution is controlled by maintaining the amount of lead in the concentrate in a range from about 3% to about 4%, preferably 3.7% to about 3.8%. In another embodiment the particle size distribution is controlled by using a pelletized feed or by the combination of the steps of using a pelletized feed and regulating the lead content of the concentrate.

Abstract: The invention is directed to a process for dehydrating wet BOF scrubber sludge to produce a steelmaking revert having an improved flow rate when handled in a recycle stream. Wet sludge is combined with hot BOF slag to provide a slag/sludge mixture. The wet sludge causes the mixture to have a moisture content greater than 10% water by weight, and the hot slag, having a temperature below the molten liquid state, vaporizes the water in the mixture and reduces the moisture content to about 4% water by weight or less. The dehydrated mixture has improved flow rate properties when it is recycled as a steelmaking revert.

Abstract: A grinding aid and an enhanced roll press method of grinding granulated blast-furnace slag by treating the slag feed of the roll press with from about 0.002 to 0.2 weight percent of polyacrylic acid or its alkali metal salt in combination with up to about 4 weight percent water.

Abstract: In the manufacture of cold-moulded briquettes from iron-containing waste metallurgical material mixed with a binder, in order to obtain high-strength briquettes and almost complete reducibility, magnetite waste metallurgical material such as scale (1) is mixed with haematite fine material (5) to form a layer (10) of haematite line materials (5) enveloping the individual magnetite particles (9), after which the binder is added to the mixture (FIG. 1).

Abstract: An improved method of extracting minerals from ore is described. The method is applicable to vat leaching operations and may also be useful in heap leaching operations. The method involves the pre-heating of comminuted ore prior to the agglomeration phase. The method is found to improve the quality of the agglomerate and to reduce the curing cycle time. In addition, the method described herein induces extra heat into the agglomerated mass which, as well as enhancing the agglomerate quality, adds heat to the leach solution resulting in higher mineral recoveries. The method is especially useful in the winter months when ore temperatures are low; however, improved results are realized when the method is used in the summer months as well.

Abstract: Composite pieces of high density and strength are made continuously from mixtures of fine particles of bituminous or subbituminous or lignite coals and particles of carbon reducible oxides. The particles are mixed with water, compressed to squeeze out some of the water to obtain single bodies which are heat processed lying on a traveling grate on which the composites undergo drying, pyrolyzing, carbonizing and cooling.A modification includes mixing in with the coal material(s) listed above, coke fines or char or anthracite coal. The carbon reducible oxides utilized are such as the oxidic ores of Fe, Mn, Cr and quartzite in recited important proportions that make the formed composite bodies usable in a submerged arc furnace or in a low shaft blast furnace or in an open hearth to produce desired intermediate or end metallic products such as ferromanganese, Fe-Cr base metal for stainless steel, iron, ferro-alloys or silicon.

Abstract: The present invention relates to ultrafine comminution of mineral and organic powders with the aid of ball-milling techniques employing, as the grinding medium, solid (nonporous) metal-carbide microspheres with diameters of from 10 to 100 .mu.m fabricated with the aid of high-temperature plasma-torch reactors from fully liquefied carbides of tungsten, thallium, niobium and vanadium.

Abstract: A process for consuming oily sludge waste product in steel making operations includes spraying a waste slurry onto the moving porous bed of a sinter strand. A burner hood is spaced above a portion of the moving bed. The bed carries a sinter mix which is ignited in the ignition zone of the burner hood and the slurry is sprayed onto the ignited sinter mix immediately downstream of the ignition zone. A vacuum system draws the slurry through the ignited sinter mix ensuring substantially complete combustion of the slurry.

Abstract: The specification discloses a process for heating solid particulate materials. The process comprises entraining the solid particulate materials in a gas to form a stream of gas containing entrained particles and containing this stream with a stream of hot gases. The contact between the two streams is performed in such a manner that at least a portion of the solid particulate material is heated rapidly and the heated and unheated particles enter flow patterns in which contact between the particles and with interior surfaces of contact chamber is minimized. A heating and treatment chamber for applying the process to the treatment of solid particulate materials is disclosed. The specification also discloses a molten bath reactor combined with the chamber for heating and treating solid particulate materials.

Abstract: A process for the passivation of fine particulate matter exiting a reactor train for the manufacture of organohalosilanes comprising treating the particulate matter or fines with an aqueous medium comprising a polyalkylene ether surfactant and optionally an acidifying agent to produce hydrogen, separating the fines from the aqueous medium, and removing water from the fines.

Abstract: A dry process for cold briquetting of metallurgical dusts, including converter steel dust, to provide transportable briquettes which do not give off dust, including the steps of admixing metallurgical dust and at least one basic additive selected from the group consisting of lime, dolomite, magnetite, dunite, olivine and bauxite, in burnt or unburnt form, to provide a mixture, and forming the mixture into briquettes at pressures in excess of 10,000 bar and at ambient temperature.

Abstract: An improved process for the removal of organic matter from bauxite ore containing gibbsite comprises heating the ore under roasting conditions including a roasting temperature of from about 400.degree. C. to about 600.degree. C. with oxygen-containing roasting gas having a moisture content of less than 1% by volume water until the water of crystallization of the alumina present in the treated product is less than 0.5 mole per mole of alumina.