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| Number | Title | Issue Date |
| 7604783 | Reduction of lime consumption when treating refractor gold ores or concentrates The present invention is directed to a precious metal recovery process in which basic ferric sulphates and/or jarosites are controlled by a number of mechanisms, including control of the oxidation reaction conditions in the first autoclave compartment, hot curing of... | 10/20/2009 |
| 7285222 | Method for recycling sludge during waste-water treatment A method for recycling sludge during waste-water treatment firstly utilizes a process of chemical coagulation to produce sludge rich in copper ions. The sludge is then leached in a sulfuric acid storage tank with sulfuric acid of concentration 1-2N, whereby a extrac... | 10/23/2007 |
| 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 |
| 6933861 | Key-operating device for a hand-held video game apparatus A key-operating device includes a shell confining a chamber therein and connected to a video game apparatus with depressible keys, a lever pivotally mounted in the chamber and having protrusions projecting toward the keys, a wheel surrounding and connected to the sh... | 08/23/2005 |
| 6007600 | Method for producing copper in hydrometallurgical process The invention relates to a method for producing copper in a hydrometallurgical process from copper-bearing raw materials, such as sulfidic concentrates. The concentrate is leached in a leaching stage of several steps into a chloride-based solution. The co... | 12/28/1999 |
| 5650057 | Chloride assisted hydrometallurgical extraction of metal A process for the extraction of a metal from an ore or concentrate comprises subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic solution containing halogen ions and a source of bisulphate or sulphate ions, such... | 07/22/1997 |
| 5645708 | Chloride assisted hydrometallurgical copper extraction A process for the extraction of copper from a sulphide copper ore or concentrate comprises subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic chloride solution to obtain a resulting pressure oxidation filtrate ... | 07/08/1997 |
| 5484579 | Hydrometallurical recovery of copper and zinc from complex sulfide ores A continuous hydrometallurgical process for conversion of ore derived copper and zinc sulfides into recoverable water soluble sulfates is provided. The process comprises: i) contacting the ore derived copper and zinc sulfides with sulfuric acid and with n... | 01/16/1996 |
| 5431788 | Chloride assisted hydrometallurgical copper extraction A process for the extraction of copper from a sulphide copper ore or concentrate comprises subjecting the ore or concentrate to a first leaching at an elevated temperature and pressure in the presence of oxygen and a lixiviant which comprises an acidic so... | 07/11/1995 |
| 5348713 | Recovery of metal values from zinc plant residues A process is disclosed for recovering zinc, lead, copper and precious metals from zinc plant residue, said process comprising leaching the residue with return zinc spent electrolyte, neutralizing residual acid and reducing ferric iron in the solution by a... | 09/20/1994 |
| 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 |
| 5320759 | Selective recovery of heavy metals using xanthates A process for selectively recovering dissolved heavy metals from a solution is disclosed that involves selectively reacting a xanthate with such dissolved heavy metals. Selective reaction of a xanthate with selected dissolved heavy metals is accomplished ... | 06/14/1994 |
| 5316751 | Methods for mine tailing clean-up using recovery technologies A method for site remediation for mitigating contamination from metals or metal compounds, particularly resulting from the situation of mine tailing waste on or near water sources, including the reprocessing and redeposit of separated sands and slimes in-... | 05/31/1994 |
| 5188713 | Process for recovery of metal A process for recovery of metal from a feedstock comprising copper is provided. The process comprises the steps of: (a) contacting the feedstock with an aqueous mixture comprising ammonium nitrate having a concentration greater than about 1.5M and sulphuric ac... | 02/23/1993 |
| 5147618 | Process for recovery of gold from refractory gold ores using sulfurous acid as the leaching agent A process for recovering gold from refractory gold-bearing ores uses sulfurous acid as the leaching agent to form a gold-sulfite complex. The ore is ground, slurried blended with a chelating agent and then subjected to a simultaneous dissolved SO2 | 09/15/1992 |
| 5147617 | Process for recovery of gold from gold ores using a complexing pretreatment and sulfurous acid leaching A process for recovering gold from gold-bearing ores includes the steps of forming a slurry of ground ore and treating the ore with an oxidizing and complexing agent such as hydrogen sulfide or a sulfide salt. A chelating agent, SO2, air, and a... | 09/15/1992 |
| 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 addition of finely ground steel to the solution. With the ... | 02/04/1992 |
| 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 |
| 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 |
| 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 |
| 4731113 | Method for the recovery of precious metals from ores A process for the recovery of precious metals from ore containing the same is disclosed. The process includes the formation of a lixiviant solution including a thiourea compound, urea and an alkali lignin sulfonate. The ore is then exposed to this lixivia... | 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 |
| 4654078 | Method for recovery of precious metals from difficult ores with copper-ammonium thiosulfate Precious metals such as gold and silver are recovered from difficult-to-treat ores, especially those containing manganese and/or copper, by lixiviating the ores using copper-ammonium thiosulfate in which the pH of the lixiviating solution is maintained at... | 03/31/1987 |
| 4645535 | Method for the recovery of precious metals from ores A process for the recovery of precious metals from ore containing the same is disclosed. The process includes the formation of a lixiviant solution including a thiourea compound, urea and potassium lignin sulfonate. The ore is then exposed to this lixivia... | 02/24/1987 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 4545963 | Process for separately recovering zinc and lead values from zinc and lead containing sulphidic ore A process for separately recovering zinc and lead values from zinc and lead containing sulphidic ore which also contains iron comprises subjecting ground ore to a first flotation step to float an initial lead concentrate containing zinc and produce zinc a... | 10/08/1985 |
| 4511540 | Exploitation of copper, nickel and cobalt by treating manganiferous matrix oxidized ores Process for treating oxidized ores with a manganiferous matrix to recover the small quantities of copper, nickel and cobalt, which consists of attacking the aforementioned ore by means of an aqueous solution of H2 SO4 with the simult... | 04/16/1985 |
| 4431613 | Leaching of sulphidic mattes containing non-ferrous metals and iron A method of treating sulphidic mattes containing from 5% to 60% iron; from 15% to 40% sulphur together with soluble non-ferrous metals such as copper, cobalt, nickel and zinc and also optionally insoluble non-ferrous metals which term includes platinum gr... | 02/14/1984 |
