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7572418 |
Process to obtain titanium concentrates with high contents of TiO2 and low contents of radionuclide elements from anatase mechanical concentrates
A process for production of titanium concentrate with low contents of radionuclide elements from anatase mechanical concentrates. The process involves calcination in air and reduction with hydrogen...
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6592644 |
Sulfidization of sulfide ores for hydrometallurgical extraction of copper and other metals
The invention relates to a method for the extraction of metals from copper sulphide and/or copper iron sulphide ores with microbiological- and chemical-type leaching steps for dissolution of the...
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6274104 |
Non-ferrous metal recovery method utilizing a melt sulphation reaction
The invention relates to a method for recovering non-ferrous metals, particularly nickel, cobalt, copper, zinc, manganese and magnesium, from materials containing said metals by converting said...
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5993512 |
Method and system for recycling byproduct streams from metal processing operations
A method and system for recycling byproduct streams from metal processing operations introduces a flow of a molten mixture of salts, metal and metal oxides from a melting vessel into a flow of...
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5855645 |
Production of more concentrated iron product from industrial waste materials streams
A method for producing a more concentrated iron product from an industrial waste materials stream comprising iron and non-iron constituents such as EAF and basic oxygen furnace dust generally...
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5849063 |
Production of direct reduced iron and/or pig iron from industrial waste streams
A method for producing direct reduced iron or/and pig iron from an industrial waste materials stream such as EAF and blast furnace dust generally comprising the steps of separating the materials...
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5846290 |
Method for the recovery of group IA salts during the treatment of industrial process waste streams
A method for the production of Group IA salts during a process for the recycling of industrial waste streams containing Group IA compounds and iron and/or zinc compounds, by heating the waste...
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5827347 |
Process for the recovery of lead from spent batteries
A process for the recovery of lead from spent battery paste and lead containing materials. The process includes the steps of calcination of a spent paste treated with an alkali carbonate or...
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5803947 |
Method of producing metallic magnesium, magnesium oxide or a refractory material
Metallic magnesium and pure magnesium oxide are produced by carbothermal reduction of starting materials such as magnesium oxide containing minor amounts of oxides of Fe, Si, Ca and Al, and/or...
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5788739 |
Process for recovering metallic lead from exhausted batteries
The present invention relates to a process for the recovery of metallic lead from exhausted lead-acid batteries. According to the invention, the metallic scrap obtained thereof is treated by a...
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5766307 |
Method of treating zinc-containing substance
Method and apparatus for collecting valuable products, particularly zinc, from a zinc-containing substance such as electric furnace dust. A shaft type smelting reduction furnace has a packed bed of...
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5755853 |
Process for the treatment of solid residues containing metals, in particular residues from the cleaning of household garbage incineration smoke
This process comprises; mixing (1) the solid residues with a solid reducing agent; treating (2) the mixture in a furnace at a temperature above 1000° C. to obtain (3) a vitrified product rendered...
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5730774 |
Process for upgrading titaniferous materials
A process for removing impurities from a titaniferous material that has been subjected to thermal reduction and which includes a titaniferous phase of general formula M 3 O 5 . The thermally...
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5728197 |
Reclamation process for tungsten carbide/cobalt using acid digestion
Tungsten carbide cobalt and tungsten-containing materials are recycled using a single high-temperature oxidation with standard dilution chemistry. The scrap material is ground, oxidized, and...
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5725632 |
Method for processing and utilizing metalliferous presipitates from the gas cleaning phase in thermal waste treatment
A method for processing hetrogeneous metal-containing deposits recovered from the cleaning of synthesis gas produced during the thermal treatment of wastes containing metals, including volatile...
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5679131 |
Method for producing titanium oxide from ore concentrates
A method for producing titanium dioxide from an iron-containing titanium ore concentrate includes heating the ore concentrate in the presence of a reducing agent to provide a sintered reaction...
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5667555 |
Method for the removal of calcium by products during the production of an iron feedstock
A method for the removal of calcium byproducts created during the production of an iron-based feedstock suitable for use as the feedstock for steel mills, from industrial waste streams containing...
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5647876 |
Method of removing volatile metals from slag using an acid wash
A method is disclosed for recovering condensed solidified volatile metals from the slag that exits the reactor section of a partial oxidation reactor. In a partial oxidation reactor, condensed...
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5613998 |
Reclamation process for tungsten carbide and tungsten-based materials
Tungsten carbide and/or tungsten can be recycled by oxidizing the tungsten composition at a temperature greater than 700° C. to form a water insoluble tungsten trioxide. This is then reduced to...
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5356455 |
Process for recovering lead from lead-containing raw materials
There is proposed a process for recovering lead, comprising the steps of: feeding molten caustic soda, lead-containing feed and an oxygen-containing gas into a reaction some having a temperature of...
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5352270 |
Method for recycling metal containing electrical components
The present invention relates to methods of recycling metal containing electrical components to recover one or more metal values therefrom by comminuting the used metal containing electrical...
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5322548 |
Recovery of niobium metal
Ferroniobium, ferrotantalum and ferrovanadium alloys are hydrogenated to facilitate crushing then nitrided, and then acid-leached to produce a soluble iron nitride leachate and a niobium, tantalum...
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5290535 |
Process for recycling saltcake
Saltcake generated by the aluminum industry is completely recycled through a process that simultaneously liberates the contained aluminum metal and dissolves the soluble salt fluxes to recover...
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5221325 |
Process for recovering silver oxide and metals from spent silver oxide button cells
A process for recovering silver oxide and metals from a spent silver oxide button cell. The process relates to a physical process which consists of a heating and a cooling process to separate the...
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5120353 |
Hydrometallurgic method for processing raw materials containing zinc sulphide
The invention relates to a method for recovering various valuable materials in connection with the hydrometallurgical production of zinc. The method is particularly suited for feeding different...
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5039336 |
Recovery of scandium, yttrium and lanthanides from zircon sand
This is a process for extracting scandium from zircon ore. It utilizes feeding zircon sand to a fluidized bed chlorinator at about 1000° C. to produce a vaporous (principally zirconium and silicon...
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4986977 |
Recovery of useful products from by-products of phosphate conversion coating process
The process is described for treating the sludge formed in a phosphate conversion bath, and in particular, in zinc phosphate conversion baths to convert the sludge into useful chemical materials...
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4985216 |
Reduction roasting of metal ores
A process is provided for the reduction roasting of ores using a C 2 to C 8 hydrocarbon. The process is particularly applicable to manganese dioxide containing ores and provides enhanced...
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4789446 |
Method of processing residues from the hydrometallurgical production of zinc
In conjunction with an electrolytic production of zinc, the residues are processed so that the residue is leached with cell acid at a temperature from 50° to 100° C. in such a manner that a...
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4778520 |
Process for leaching zinc from partially desulfurized zinc concentrates by sulfuric acid
A process comprises leaching zinc oxide either separately or in conjunction with iron oxides from a partially desulfurized zinc bearing sulfide ore of concentrate. The ore is pretreated to...
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4756889 |
Process for recovering metals and metallic salts
A process for recovering solder alloys and metallic salts from ZnCl 2 -containing dross/flux salt feedstock by (1) heating a quantity of the feedstock to melt the salts and to separate and/or to...
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4725414 |
Process for producing gallium-containing solution from aluminum smelting dust
5 to 50 wt. % of an alkaline flux such as sodium carbonate, sodium hydroxide, potassium carbonate and potassium hydroxide is added and mixed to aluminum smelting dust. The mixture is roasted, the...
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4725312 |
Production of metals by metallothermia
The metals of Groups (IV)(B) or (V)(B) of the Periodic Table, or of the lanthanide series, e.g., titanium metal, are conveniently produced, notably in powder form, by reducing a salt of such a...
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4671803 |
Process for producing synthesis gas free-from volatile metal hydrides
Process for producing synthesis gas, reducing gas, or fuel gas substantially free-from volatile metal hydride impurities e.g. a hydride of arsenic, germanium, antimony, lead, tin, silicon, and...
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4579589 |
Process for the recovery of precious metals from a roaster calcine leach residue
A process for separating precious metals from a roaster calcine leach residue from a process wherein copper or zinc sulfides are roasted to produce a copper or zinc calcine; the calcine is leached...
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4490174 |
Process for the preparation of a ferronickel concentrate
A ferronickel concentrate is produced by reducing a lateritic ore comprising less than 1.5% w of nickel at a temperature of from 920° to 1120° C. with a CO/CO 2 mixture in the presence of a...
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4437888 |
Preparation of titanium/aluminum alloys
Alloys comprising titanium and aluminum, or titanium, aluminum and at least one of the metals M, wherein M is vanadium, zirconium, chromium, niobium, tantalum and/or iron, are facilely prepared by...
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4415144 |
Process and apparatus for removing a layer of fluid on top of a bath
In the removal of a layer of fluid located on a bath, such as a layer of reaction products in pyrometallurgical crude-lead refining, the layer is propelled by an agitating mechanism into the intake...
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4415357 |
Solid waste treatment in reduction of iron ore
In the direct reduction of iron ore wherein a solid mixture of unused carbonaceous reductant and spent flux is roasted to convert calcium sulfide to sulfate, the solids recovered from the roasting...
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4400337 |
Method for production of metal magnetic particles
A method for the production of uniform acicular metal magnetic particles comprising predominantly iron which have excellent magnetic characteristics and are useful as a recording element for a...
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4390365 |
Process for making titanium metal from titanium ore
The instant invention relates to a process for the preparation of titanium metal from an ore comprising titanium oxides which process comprises the steps of fluorinating the ore to convert the...
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4384885 |
Process for the recovery of metals from catalysts
A process for the recovery of valuable metals from spent desulfurization catalyst wherein the catalyst, which has not been subjected to oxidative roasting, is thermally reduced in the presence of...
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4379714 |
Method for regulating the granulometric characteristic of the components in metallurgical slags
A method for regulating the granulometric characteristics of the components in metallurgical slags comprising the step of imparting a vibration to the slag, after the separation of the slag from...
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4377410 |
Chromium recovery from superalloy scrap by selective chlorine leaching
To recover chromium and other metals from scrap such as superalloy scrap, the scrap is sulfided to provide a molten matte which is cooled and fragmented, the fragments are leached selectively in an...
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4362560 |
Process for producing high-purity gallium
A process for producing high-purity gallium from gallium-arsenic containing wastes resulting from the manufacture of semiconductors which comprises a vacuum-thermal decomposition of said wastes...
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4337226 |
Recovery of platinum-group metals from ores
Metal values are recovered from ore concentrates by means of dry grinding, followed by a two-stage leaching process in which the ground concentrate is first leached with sulfuric acid at a...
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4328192 |
Ammoniacal nickel leach of laterites
In a hydrometallurgical process for the recovery of metal values from a metal bearing source in which a metal bearing source is treated at a temperature in the range of from about 300° to about...
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4305754 |
Chromium recovery from scrap alloys
Disclosed is a process for recovering chromium, vanadium, molybdenum, and tungsten from secondary resources such as alloy scrap comprising a refractory metal and base metals such as cobalt nickel,...
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4244734 |
Process for recovering metal values from materials containing arsenic
An improvement in hydrometallurgical recovery of metals, i.e. copper, zinc, cadmium, germanium, indium, lead, silver, gold, antimony and bismuth from materials such as flue dust containing arsenic...
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4236699 |
Apparatus for wet-post treatment of metallized iron ore
An apparatus and process for treatment of metallized iron ore produced by direct reduction techniques principally for use in various iron and steelmaking furnaces. The apparatus and process...
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