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7615199 |
Method for the recovery of valuable metals and arsenic from a solution
The invention relates to a method for the treatment of material containing at least one valuable metal and arsenic to form a valuable metal-depleted scorodite sediment and a pure aqueous solution...
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7563420 |
Method for recovering rhodium and silver from hydrochloric acid
Object: This invention provides a method of refining an Rh-containing solution also containing at least one type of impurities of heavy metals, alkaline earth metals, and Ag. Means for solving the...
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7297315 |
Method of recovering a cleaning agent
The invention provides a method of recovering a copper component or a manganese component from a cleaning agent containing copper oxide, a cleaning agent containing basic copper carbonate, a...
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7291292 |
Preparation of silver particles using thermomorphic polymers
This invention relates to the synthesis and isolation of colloidal silver particles through the use of thermomorphic polymers and the resulting composition. It further relates to the use of the...
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7175819 |
Regeneration of cupric etchants and recovery of copper sulfate
Spent, acidic solutions comprising cupric chloride and hyrdrochloric acid from the copper etching process are regenerated by a process in which the acid is subjected to distillation with sulfuric...
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7160526 |
Process for detoxification of CCA-treated wood
A chemical process for detoxifying spent CCA (copper, chrome, arsenic)—treated wood, from which CCA and detoxified wood are recovered for recycling comprising the steps of (a) treating...
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6929677 |
Method for leaching copper concentrate
This invention relates to a method where sulfidic iron-bearing copper concentrate is leached on the countercurrent principle, in a chloride environment. The leaching takes place with the aid of...
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6773487 |
Process for refining silver bullion with gold separation
A process is disclosed for refining silver bullion, i.e. raw silver containing generally more than 90% silver besides Se, Pb, Au, Cu and platinum group metals (PGM) as main impurities. The process...
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6663689 |
Process for direct electrowinning of copper
A system and process for recovering copper from a copper-containing ore, concentrate, or other copper-bearing material to produce high quality cathode copper from a leach solution without the use...
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6337056 |
Process for refining noble metals from auriferous mines
A process for refining noble metals from auriferous mines, wherein the auriferous material is first milled and treated with a cyanide solution, and comprising: a step for the pretreatment of the...
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6290747 |
Conversion of impure silver halide to ultra-pure silver metal
A method for preparing ultra-pure silver from a crude silver halide matrix containing metallic and/or non-metallic impurities, said method comprising; roasting the crude silver halide matrix to...
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6290749 |
Preparation of ultra-pure silver metal
A method for preparing ultra-pure silver from a crude silver mixture containing metallic and/or non-metallic impurities, said method comprising; dissolving the crude silver mixture in nitric...
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6177571 |
Method for removing heavy metals from organic compounds
A method for removing heavy metals, selected from palladium, tin and nickel, from heavy metal complexes with thiazole compounds in aqueous or alcoholic solution, by precipitation as sulfides,...
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6110254 |
Method for chemical precipitation of metallic silver powder via a two solution technique
A method for the chemical precipitation of metallic silver powder employs a two solution technique in which a solution of a tin salt and a solution a silver salt are mixed in the presence of an...
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5993668 |
Method for removing metal ions and/or complexes containing metal ions from a solution
Metal ions and/or complexes of metal ions are removed from a solution by formation of an insoluble chelated complex of the metal ions and a polymeric precipitating agent. A two-step process of...
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5961879 |
Process for the manufacture of hypochlorite bleaching compositions
The present invention discloses a process for the manufacture of liquid aqueous bleaching compositions comprising hypochlorite, a strong source of alkalinity and water, said process comprising the...
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5928559 |
Process for the manufacture of hypochlorite bleaching compositions
The present invention discloses a process for the manufacture of liquid aqueous bleaching compositions comprising alkali metal hypochlorite, a strong source of alkalinity and water; said process...
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5912402 |
Metallurgical dust recycle process
A treatment of metallurgical dust and recovery of valuable chemical commodities, comprising the steps of: leaching salts from the dust with water to create a washed EAF dust; reacting the washed...
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5531903 |
Fluoride removal from metal sulphate solution and a method of waste utilization
A process is provided for the removal of fluoride from a metal sulphate solution, such as a zinc sulphate solution, which presents an option for the disposal of waste treatment sludge from the...
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5520814 |
Process for recovering spent metal etching solutions
A process comprising spent metal etching solutions, the process comprising the steps of: 1) extracting the metal ions from the spent etching solution by means of a liquid ion exchanger; 2) washing...
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5505857 |
Process for the treatment of metal-containing water and recovery of metals therefrom
Metals contained in various wastewaters are selectively recovered as metal precipitates and/or as spinel ferrite and water suitable for discharge into the environment is obtained. High grade...
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5380443 |
Method of treating waste water
A process of treating water to remove metal ion contaminants contained therein, said metal ion contaminants selected from the group consisting of metals in Groups 8, 1b, 2b, 4a, 5a, or 6a of the...
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5342430 |
Passivation of methylchlorosilane fines
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...
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5332560 |
Process for the removal of zinc and nickel from copper ammine sulfate solutions
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...
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5328669 |
Extraction of precious metals from ores and other precious metal containing materials using halogen salts
Platinum group metals, gold and silver are extracted from complex ores, automobile scrap, refractory ores and as naturally occurring by leaching the precious metal containing materials with a...
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5271909 |
Method of tellurium separation from copper electrorefining slime
A method of increasing the extraction of tellurium from copper electrorefining slime comprises leaching the slime with dilute sulphuric acid in a reactor under a partial oxygen pressure of up to...
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5263044 |
Remelting method for recognition and recovery of noble metals and rare metals
Method for recognition of noble metals otherwise not recognizable in base material clusters includes using an electron beam furnace in which base material clusters are vaporized by means of an...
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5234669 |
Recovery of non-ferrous metals from smelter flue dusts and sludges
Methods are disclosed for treating smelter flue dust and other smelter by-products so as to recover non-ferrous metals therefrom and convert arsenic and sulfur in the flue dust into non-leachable...
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5207996 |
Acid leaching of copper ore heap with fluoroaliphatic surfactant
Improved methods of heap leaching of copper ore with aqueous sulfuric acid solutions comprising a fluoroaliphatic surfactant are disclosed. The fluoroaliphatic surfactant increases the amount of...
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5173276 |
Method for recovery of copper from copper-containing materials
A process for precipitating solid hydrates of cupric tetrammine sulfate from a solution, wherein the solution contains at least 40 grams per liter of free ammonia, at least 50 grams per liter of...
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5139752 |
Method for extraction of gold and silver from ore with a solution containing a halogen, halogenated salt and organic solvent
From an ore containing gold and silver, the gold and silver are extracted by a method which comprises pulverizing the ore and bringing the pulverized ore into contact with an elemental halogen, a...
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5137700 |
Processes employing iodine-iodide etching solutions
Aqueous iodine-iodide etching solutions are employed in the recovery of precious metals. Elemental iodine is precipitated from spent etching solutions and used to supply both the iodine and iodide...
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5133948 |
Process for the removal of bismuth from copper refining electrolyte by using lead oxide
Bismuth impurity is removed from copper electrolyte by contacting the electrolyte with an effective amount of finely divided lead oxide.
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5126116 |
Method for forming copper arsenate
The invention provides a method of forming copper arsenate. Copper and arsenic are leached into a treatment solution maintained at a pH level of about 2 to 5 in the presence of at least one...
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5114687 |
Ammonia extraction of gold and silver from ores and other materials
Gold and silver are extracted from their elemental state or from complex ores and alloys by leaching them with a solution containing ammonia, ammonium salts and one or more oxidants. The process is...
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5102640 |
Process for removing metal ions from solution with a dipicolylamine chemically bound to the surface of a silicate
Dipicolylamine (DPA) is chemically bound to the surface of a silicate, forming a solid phase particle without substantially decreasing the affinity constant of the DPA for certain ions. Then, the...
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5085836 |
Process for desilvering silver halide processing fluids
A method to reduce dissolved silver present in spent, waste, photographic processing fluids containing thiosulfate, is described. This process involves adjusting the pH to a low level prior to the...
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5055309 |
Production process for kefir-like fermented milk
A kefir-like fermented milk is produced from a raw material, which contains lactose and at least one sugar, by subjecting the lactose to lactic acid fermentation with a lactic acid bacterium and...
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5000928 |
Preparation of ultra-pure silver nitrate
Ultra-pure silver nitrate is prepared from crude silver by a process comprising the steps of dissolving the crude silver in nitric acid to form a crude silver nitrate solution; adding an alkaline...
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4980071 |
Substituted thioureas for the separation of complexly bound heavy-metal ions
Heavy metals can be precipitated from waste water or aqueous reaction solutions containing inorganic and/or organic complexing agents with substituted thiorureas of the general formula R 1 R 2 ...
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4956154 |
Selective removal of chromium, nickel, cobalt, copper and lead cations from aqueous effluent solutions
Aqueous effluent solutions containing metal cations may be treated with an extractant comprising an organophosphinic acid, a di-2-ethylhexyl phosphoric acid and/or an aliphatic amine to selectively...
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4925485 |
Process for the isolation of noble metals
The present invention involves the isolation or leaching of noble metals from materials containing noble metals, e.g. ores, by treating the noble metal- containing materials with a cyclic thiourea...
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4915730 |
Process and apparatus for recovery of flue dust
A process and apparatus for the recovery of metals such as silver from phosphate flue dust. The process includes the steps of blending chloride salt and the flue dust to produce a blended material,...
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4885098 |
Sonic method for facilitating the removal of solid particles from a slurry
An elastic bar member is coupled to an orbiting mass oscillator and the entire assembly is suspended from a cable or the like such that the bar member has freedom of lateral motion and is nakedly...
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4883532 |
Sonic method for facilitating the extraction of minerals from ore in a leachant
An elastic bar member is clamped to an orbiting mass oscillator and the entire assembly is suspended from a cable or the like such that the bar member has freedom of lateral motion and is nakedly...
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4878945 |
Hydrometallurgical process for treating refractory ores containing precious metals
This invention is directed to an improved process for leach treating gold and silver bearing pyritic and arsenopyritic concentrates and ores. More particularly, the improved process avoids the...
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4859293 |
Process for refining gold and apparatus employed therefor
Disclosed are processes and an apparatus for refining gold. One of the processes comprises dissolving unrefined gold by use of iodine and/or an iodide compound to form a solution containing an...
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4828809 |
Separation of nickel from copper in autoclave
Nickel is separated from copper contained in predominantly nickel- and copper-bearing sulphidic matte and alloys by chlorine leaching in an autoclave at over-atmospheric pressure. The leaching is...
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4816235 |
Silver and manganese recovery using acidified thiourea
A method for obtaining silver and manganese metal from a silver-manganese ore includes the step of leaching the ore with acidified thiourea. More specifically, the method includes the step of...
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4802993 |
Method of treating liquid wastes containing heavy metal chelate compounds
A method of treating liquid wastes containing heavy metal chelate compounds which comprises reducing the pH of liquid wastes containing the heavey metal chelate compounds to 4 or less, adding iron...
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