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| Number | Title | Issue Date |
| 7156894 | Method for recovering metal values from concentrates of sulfide minerals A method of recovering precious metal values from refractory sulfide ores is provided. The method includes the steps of separating clays and fines from a crushed refractory sulfide ore, forming a heap from the refractory sulfide ore, producing a concentrate of refra... | 01/02/2007 |
| 6395242 | Production of zinc oxide from complex sulfide concentrates using chloride processing The present invention relates to an apparatus and a process for producing zinc oxide from a zinc-bearing material. The process according to the present invention comprises the steps of leaching the complex sulfide material with hydrochloric acid and oxyge... | 05/28/2002 |
| 5976218 | Process for the recovery of nickel A process for the recovery of nickel from a nickel containing ore in which the ore, particularly a laterite ore, is initially leached with an aqueous acid solution, after which the nickel is precipitated as nickel hydroxide by adding a hydroxide to the aq... | 11/02/1999 |
| 5954854 | Method for recovering etchant from etching waste liquid containing iron chloride Method for recovering etchant from etching waste liquid 11 containing iron chloride is disclosed, wherein iron powder is mixed with iron chloride waste solution containing metal ions having a lesser ionization tendency than iron ion in an mixing vessel so... | 09/21/1999 |
| 5951954 | Method for manufacturing clear brine fluids from impure zinc feedstock A method for utilization of zinc byproducts in the manufacture of clear brine fluids comprising the step of mixing zinc feedstock containing metal impurities with a halogenic acid to produce an impure zinc halide solution. The metal impurities are removed... | 09/14/1999 |
| 5702500 | Integrated process for the recovery of metals and fused alumina from spent catalysts An integrated process for the treatment of spent catalysts containing mainly molybdenum, vanadium, nickel, cobalt and, alumina to produce ammonium metavanadate, vanadium pentoxide, molybdic trioxide, fused alumina and a high grade nickel/cobalt alloy esse... | 12/30/1997 |
| 5454856 | Recovery of nickel in soluble form from a liquor A process for recovering nickel that is in soluble form and in relatively low concentrations, typically up to 2% by weight in a liquor, comprises: (a) precipitating nickel from solution (preferably as a hydroxide or sulphide); (b) adding an inert particul... | 10/03/1995 |
| 5393320 | Leaching process for nickel cobalt and manganese ores A process for the extraction of nickel, cobalt and manganese from slurries of their ores such as laterite, saprolite or manganese nodules in an aqueous acid solution while irradiating the solution with electromagnetic energy such as microwave energy. The ... | 02/28/1995 |
| 5284505 | Method for recovering metallic nickel from ferric chloride waste liquid Nickel ion contained in a ferric chloride waste liquid is recovered as metallic nickel by the following method. Firstly, the ferric chloride waste liquid is added with metallic iron and then heated and stirred to precipitate the metallic nickel. Thereafte... | 02/08/1994 |
| 5238663 | Nickel recovery process The invention relates to a process for recovering nickel from industrial effluents, characterized in that a) the effluent loaded with nickel is allowed to settle in a corrugated-plate separator (1) for the removal of solid constituents contained therein, ... | 08/24/1993 |
| 5200042 | Process to recover pure copper during purification of zinc sulfate solution A process for recovery of copper from a copper residue obtained during purification of a zinc sulfate solution comprises leaching the copper residue in a concentrated sulfuric acid solution in the presence of an oxidant at a temperature of between 60° an... | 04/06/1993 |
| 5104445 | Process for recovering metals from refractory ores The present invention is a process to recover metals from refractory ores. It involves the chlorination of an ore concentrate in the presence of solid salt at a temperature between 300° and 650° C. Thereafter, an oxidation step can be used to convert ir... | 04/14/1992 |
| 4906293 | Hydrometallurgical process for extracting metals from ocean-mined ferromanganese nodules An improved hydrometallurgical process for extracting metals from ocean-mined ferromanganese nodules. The process includes the steps of contacting the ferromanganese nodules in an extraction zone with an aqueous solution containing effective amounts of ch... | 03/06/1990 |
| 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 conducted in an acidic solution at a redox potential range ... | 05/09/1989 |
| 4657745 | Value recovery from spent alumina-base catalyst A process for the recovery of aluminum and at least one other metal selected from the group consisting of molybdenum, nickel and cobalt from a spent hydrogenation catalyst comprising (1) adding about 1 to 3 parts H2 SO4 to each part ... | 04/14/1987 |
| 4637832 | Process for purifying solutions of zinc sulphate A process for purifying aqueous solutions of zinc sulphate removed from leaching processes and containing metals such as Cu, Cd, Ti, Ni, Co, Ge, As, Sb which consists in cementing said metals with zinc dust and with a couple of activators chosen between C... | 01/20/1987 |
| 4548793 | Electrochemical elimination of nickel from lead containing chloride solutions The invention relates to a process for removing nickel from lead chloride dissolved into chloride brine to obtain lead chloride solution wherein the nickel concentration is under 50 mg/liter. The present invention comprises the following steps: (a) adjust... | 10/22/1985 |
| 4338169 | Process for promoting physical and/or chemical reactions performed in a fluid medium The process comprises subjecting a magnetic material dispersed in the fluid to the action of a variable magnetic field. It is thus possible to provide efficient stirring of this fluid and to facilitate reactions taking place, between a constituent of the ... | 07/06/1982 |
| 4311521 | Membrane separation of catalyst metals from trimellitic acid production and separation of cobalt from manganese Precipitation-free recovery of catalyst metal content of residue from manufacture of trimellitic acid by oxidation with source of molecular oxygen of liquid pseudocumene in presence of cobalt and manganese, cobalt, manganese and cerium, followed by remova... | 01/19/1982 |
| 4309215 | Method for the cementation of metals A method for the cementation of a metal from a solution containing metallic ions by the addition of a finely divided cementation medium, wherein the cementation reaction is carried out in a reaction chamber located in an oscillating reactor which is at le... | 01/05/1982 |
| 4309390 | Separation of cobalt and manganese from trimellitic acid process residue by extraction, pH adjustment, and magnet Recovery of cobalt and manganese metal oxidation catalysts from residue of trimellitic acid manufacture and separation of recovered cobalt from recovered manganese can be accomplished by a novel method involving dissolving the residue in water, displacing... | 01/05/1982 |
| 4304644 | Autoclave oxidation leaching of sulfide materials containing copper, nickel and/or cobalt A process is provided for treating a matte for selective extraction of nonferrous metals using a single stage oxidative pressure leach wherein leaching is carried out in a continuous manner and relatively mild conditions on an aqueous slurry of the matte ... | 12/08/1981 |
| 4298580 | Separation of cobalt and manganese from trimellitic acid process residue by precipitating as carbonates, redissolving as halides and removing cobalt by magnetic means Recovery of cobalt and manganese from residue of trimellitic acid manufacture and recovery as 4-carboxy-phthalic anhydride by extracting the residue with an aqueous alkaline solution containing carbonate ions which leaves a precipitate of metal carbonates... | 11/03/1981 |
| 4274931 | Leaching process for zinc sulphide containing materials A process for treating zinc sulphide materials wherein the sub-divided material is firstly leached, at less than 119° C., with a sulphate leach solution, low in sulphuric acid and having a high iron content together with zinc and impurities in a manner c... | 06/23/1981 |
| 4252622 | Continuous process for the purification of zinc plants electrolytes using copper arsenates Continuous process for the purification of zinc plant electrolyte employing copper arsenate for the removal of cobalt and associated impurities in a four-step treatment comprising: (1) cementation of copper with fine zinc dust, (2) precipitation of the major p... | 02/24/1981 |
| 4240826 | Process for the recovery of arsenic as a zinc arsenate and its _utilization in the purification of zinc plant electrolytes The invention described herein relates to metallurgical processes for the recovery of zinc arsenate from cement copper cake residues, and the use thereof in the purification of impure zinc electrolyte.... | 12/23/1980 |
| 4152143 | Method and apparatus for precipitating metal cement Improved method adapted for the continuous precipitation of metal cement (especially copper cement) from an aqueous solution of a first metal (such as copper) mixed with pieces of second metal (such as iron) which is less noble than such first metal. The ... | 05/01/1979 |
| 4149945 | Hydrometallurgical brass dust reclamation A process for winning copper and zinc from brass mill waste products containing oxidic copper and zinc, iron, nickel, or cobalt. The feed material is leached in sulfuric acid, neutralized to a pH between about 2.5 and 3.0, and treated with zinc metal to p... | 04/17/1979 |
| 4144056 | Process for recovering nickel, cobalt and manganese from their oxide and silicate ores A process for recovering the metals manganese, nickel, and cobalt from their oxides and silicates in which the metal oxide or silicate is heated with ferric chloride in the absence of air and in the presence of a volatility depressant salt which is prefer... | 03/13/1979 |
| 4060410 | Process for removing heavy metals from fluid media A process in which metal foil is introduced into a fluid containing one or more heavy metals, so that one part of the surface of the foil is in contact with the fluid and another part thereof is in contact with air and that an activator in the form of a s... | 11/29/1977 |
| 4030917 | Hydrometallurgical processing of metal sulfides A low pressure, low temperature, hydrometallurgical process for the recovery of metal values from chalcopyrite and other metals and other metal sulfides. The process provides for all sulfur recovery as sulfuric acid and is nonpolluting, uses no neutralizi... | 06/21/1977 |
