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| Number | Title | Issue Date |
| 8062615 | Production of silver sulfate grains using carboxylic acid additives An aqueous precipitation process for the preparation of particles comprising primarily silver sulfate, comprising reacting an aqueous soluble silver salt and an aqueous soluble source of inorganic sulfate ion in an agitated precipitation reactor vessel and precipita... | 11/22/2011 |
| 7261867 | Production of silver sulfate grains using organo-sulfate or organo-sulfonate additives An aqueous precipitation process for the preparation of particles comprising primarily silver sulfate, comprising reacting an aqueous soluble silver salt and an aqueous soluble source of inorganic sulfate ion in an agitated precipitation reactor vessel and precipita... | 08/28/2007 |
| 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 acid. In one embodiment, the process comprises (a) providing a spent e... | 02/13/2007 |
| 6962676 | Method and apparatus in a fluidized bed heat exchanger A method and an apparatus in a fluidized bed heat exchanger including a heat exchange chamber having a fluidized bed of solid particles, heat transfer surfaces, an inlet, and an outlet. Particles are fed through the inlet onto the upper surface of the bed of solid p... | 11/08/2005 |
| 6476287 | Sulfite treatment of spent industrial wastes A method of treating metal-contaminated spent foundry sand, or other industrial waste, by combining the sand with a sulfite to produce insoluble metal sulfur oxide complexes that do not leach from the sand. The treated waste may also be processed to reduc... | 11/05/2002 |
| 5804150 | Process for treating gold-containing sulfide ores The ore which contains gold and at least one of the metals silver, copper, nickel, zinc or iron is calcined at temperatures in the range from 500° to 900° C. with the addition of oxygen-containing gas, thereby producing a metal-oxide-containing solids m... | 09/08/1998 |
| 5783158 | Process for treating sulfide ores containing gold and/or silver and as accompanying metal at least iron The ore which contains gold and/or silver and as accompanying metal at least iron is calcined at temperatures in the range from 500° to 900° C. with the addition of oxygen-containing gas. There is obtained a metal-oxide-containing solids mixture and a S... | 07/21/1998 |
| 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 material to produce a leachate containing cuprous, nickel, and z... | 07/26/1994 |
| 5059403 | Method for producing copper sulfate from waste copper-containing liquid A method for producing copper sulfate from waste copper-containing liquid including the steps of recovery of acidic and basic copper-containing liquid, and neutralization of the liquid to form crystalline copper sulfate, wherein the ratio of acidic to bas... | 10/22/1991 |
| 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 separate chromium, nickel, cobalt, copper and lead cation... | 09/11/1990 |
| 4828661 | Process for recovery of metals from metal/plastic waste The invention relates to a process for recovery of metals from metal/plastic waste using used etching and washing solutions from the electronics industry, with the following process steps: (a) heating of the metal/plastic waste in a heating bath in order to ... | 05/09/1989 |
| 4822413 | Extraction of metal values from ores or concentrates A process is described for leaching ores or concentrates containing one or more metallic sulphides .with a circulating liquor so as to solubilize desired metal values therefrom, if said metal values are capable of dissolution in an acidic ferric sulphate ... | 04/18/1989 |
| 4786323 | Process for the recovery of noble metals from ore-concentrates A process for the hydrometallurgical recovery of gold and silver by direct oxidizing sulphuric acid-digestion of arsenopyrite-concentrates (FeAsS2) containing carbonaceous materials with a silicate gangue, and/or a silicate and pyrite gangue wh... | 11/22/1988 |
| 4778519 | Recovery of precious metals from a thiourea leach A method is provided for recovering gold and silver from precious metal bearing materials including ores, leaching residues, flue dust, electronic scrap, jewelry scrap, etc. In the method, the gold and silver are extracted from the precious metal bearing ... | 10/18/1988 |
| 4752332 | Treating manganese-containing ores with a metal sulfide A process for treating a first metal, manganese-containing ore comprising contacting the manganese-containing ore with an aqueous, acidic composition and a material containing at least one metal sulfide at conditions effective to (1) chemically reduce at ... | 06/21/1988 |
| 4740243 | Metal value recovery from metal sulfide containing ores A process for recovering at least one first metal from a metal sulfide-containing ore comprising contacting the ore with an aqueous, acidic composition and at least one reducible manganese-containing material at conditions effective (1) to chemically redu... | 04/26/1988 |
| 4735783 | Process for increasing the selectivity of mineral flotation An aqueous solution containing a water soluble polyvalent metal sulphate, an alkali metal silicate and an alkali metal metabisulphite is described which is added to a slurry of a copper mineral bearing ore to be subjected to a froth flotation step for obt... | 04/05/1988 |
| 4731114 | Recovery of precious metals from refractory low-grade ores Low-grade refractory gold ores, which may also contain silver and other metal values are treated by partial roasting of concentrate to remove controlled amounts of sulfur and carbon, then oxygen pressure leached to oxidize further amounts of sulfur and ca... | 03/15/1988 |
| 4698139 | Hydrometallurgical method for treating valuable metal raw materials containing chlorides and fluorides 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 meta... | 10/06/1987 |
| 4671945 | Method for separation and leaching of the valuable metals in sulphide materials 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... | 06/09/1987 |
| 4670052 | Process for the recovery of gold from a precious metal bearing sludge concentrate A process for the recovery of gold from a precious metal bearing sludge concentrate is disclosed. The process comprises the steps of leaching the sludge with hydrochloric acid and hydrogen peroxide to solubilize at least gold, palladium and platinum, remo... | 06/02/1987 |
| 4662938 | Recovery of silver and gold This invention provides processes for selectively recovering silver and gold values from feed materials containing both precious metals, and comprises leaching the feed material with a hot ferric chloride-acid brine leach solution for a time sufficient to... | 05/05/1987 |
| 4632701 | Process for the recovery of silver from a residue essentially free of elemental sulphur A process for the recovery of silver from a residue essentially free of elemental sulphur obtained by acidic pressure oxidation leaching or iron-containing sulphidic material which comprises forming a slurry of the residue with lime at a temperature of at... | 12/30/1986 |
| 4629502 | Pressurized reaction of refractory ores with heat recovery Metal is removed from particlized metal bearing refractory ores in an efficient manner utilizing pressure metallurgy with heat recovery. The particlized ore is mixed with a heated liquid, and preferably a flocculant and fibers, to form a slurry. The ore i... | 12/16/1986 |
| 4620964 | Process for the treatment of complex manganese ores, such as marine nodules A process for the treatment of a complex manganese ore, wherein it comprises the following stages: (a) crushing the ore, (b) subdividing the crushed ore into a first part and a second part, (c) preparing the first pulp from the first part of the crushed ore, (d) re... | 11/04/1986 |
| 4619814 | Process for the recovery of non-ferrous metals from sulphide ores and concentrates This invention relates to the development of a viable metallurgical process capable of treating low grade concentrates, bulk concentrates, dirty concentrates, or ore directly for the recovery of non-ferrous metals such as zinc, lead, copper, and precious ... | 10/28/1986 |
| 4615731 | Hydrometallurgical processing of precious metal-containing materials A hydrometallurgical process is provided for separating heavy metal nuisance elements such as As, Sb, Bi, Sn and Pb from precious metals and/or selenium. The process can be used as a step in an overall hydrometallurgical process for treating refinery resi... | 10/07/1986 |
| 4614543 | Mixed lixiviant for separate recovery of zinc and lead from iron-containing waste materials A process is disclosed for the hydrometallurgical treatment of finely divided iron-containing steel plant dusts containing zinc, lead and such other metal values as calcium, manganese, silicon, magnesium, aluminum, cadmium, copper, and the like. The proce... | 09/30/1986 |
| 4610723 | Process for leaching sulphide concentrates of the tetrahedrite type containing high concentrations of arsenic and antimony A process for lixiviation of concentrates of copper sulphides of tetrahedral type containing high concentration of arsenic and antimony to recover copper and noble metals. The concentrates are repulped into an aqueous ferrous sulphate solution with an est... | 09/09/1986 |
| 4606763 | Process for the pressure oxidation acid leaching of non-ferrous metal and iron-containing sulphidic material A process for the pressure oxidation leaching of non-ferrous metal sulphidic material which comprises providing an autoclave assembly which has a series of successive compartments, the first compartment of which being substantially larger in size than eac... | 08/19/1986 |
| 4606764 | Method of recovering metals from ores using a formate reducing agent The invention comprises the treatment of metal oxides and mixed metal oxides and metal sulfides in a vertical tube reactor system having a downcomer section and a riser section in order to oxidize and dissolve the metal values in aqueous slurry primarily ... | 08/19/1986 |
| 4605439 | Recovery of gold from refractory auriferous iron-containing sulphidic material A process for the recovery of gold from refractory auriferous iron-containing sulphidic material which comprises providing an aqueous feed slurry of fresh feed material and oxidized solids from a subsequent pressure oxidation step. The feed slurry has a p... | 08/12/1986 |
| 4594102 | Recovery of cobalt and nickel from sulphidic material 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... | 06/10/1986 |
| 4585477 | Method for separating and recovering nickel and copper from complex materials A method of recovering copper and nickel from sulphidic minerals containing copper, nickel and iron comprises the steps of roasting the mineral, preferably to provide magnetite; sulphating, for example with sulphuric acid, sulphur trioxide, metal sulphate... | 04/29/1986 |
| 4582690 | Oxidation of polythionates Thiosalts contained in waste streams are oxidized to sulfate ions in the presence of sulfur-bound copper. Air oxidation of the waste stream is effected in a slurry of the copper compound, which may be CuS, Cu2 S or chalcopyrite, and continuous ... | 04/15/1986 |
| 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 with an aqueous sulfuric acid leaching solution to produce... | 04/01/1986 |
| 4571264 | Recovery of gold from refractory auriferous iron-containing sulphidic ore A process for recovering gold from refractory auriferous iron-containing sulphidic ore which comprises feeding ground ore as an aqueous slurry to an acidic pretreatment step. The ground ore in the acidic pretreatment step is treated with aqueous sulphuric... | 02/18/1986 |
| 4571262 | Recovery of platinum group metals from nickel-copper-iron matte A process for separately recovering platinum group metal values, nickel values and copper from nickel-copper-iron sulphidic matte containing platinum group metals includes leaching ground matte at atmospheric pressure in acidic nickel-copper sulphate solu... | 02/18/1986 |
| 4571263 | Recovery of gold from refractory auriferous iron-containing sulphidic concentrates A process for recovering gold from refractory auriferous iron-containing concentrate includes feeding the concentrate as an aqueous slurry to an acidic pretreatment step and treating the concentrate in the acidic pretreatment step with aqueous sulphuric a... | 02/18/1986 |
| 4562048 | Process for the treatment of metal-bearing ores In the hydrometallurgical treatment of metal-bearing ores and particularly the beneficiation of iron-containing titaniferous ores wherein the ore is subjected to leaching with a dilute aqueous acid solution in a digestion zone, there is provided an improv... | 12/31/1985 |
