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| Number | Title | Issue Date |
| 4341742 | Cuprous chloride production from chalcopyrite A process is disclosed for producing cuprous chloride from chalcopyrite by means of a cupric chloride leach utilizing particular processing conditions in order to obtain relatively high cuprous chloride concentrations. The processing conditions are mainta... | 07/27/1982 |
| 4236918 | Recovery of elemental sulfur and metal values from tailings from copper recovery processes Process for recovery of copper, molybdenum, gold and elemental sulfur in tailings from hydrometallurgical processing of copper sulfide ores, particularly chalcopyrite. The tailings are usually discarded, and thus the recovery of valuable elements therefro... | 12/02/1980 |
| 4192676 | High temperature reduction of copper salts Copper is recovered from copper salts selected from the group consisting of copper chlorides, copper oxides and copper oxychlorides by reducing the finely divided solid copper salts with hydrogen under turbulent conditions at a temperature greater than th... | 03/11/1980 |
| 4138248 | Recovery of elemental sulfur and metal values from tailings from copper recovery processes A process for the recovery of copper, molybdenum, gold and elemental sulfur in tailings from hydrometallurgical processing of copper sulfide ores, the process comprising concentrating the tailings containing elemental sulfur and copper, gold and molybdenu... | 02/06/1979 |
| 4124379 | Recovery of silver from cuprous chloride solutions by amalgamation A process for recovering silver from chloride solutions comprising contacting the solution with amalgams of various metals from Groups 2b, 4a, 5a, or 8b of the periodic table or copper to replace the metal with silver and recovering silver from the formed... | 11/07/1978 |
| 4101315 | Recovery of silver from cuprous chloride solutions by co-crystallization with sodium chloride A process for recovering silver present in cuprous chloride solutions as a soluble silver chloride which comprises saturating the cuprous chloride solution with sodium chloride, subjecting the saturated solution to evaporation to co-crystallize the sodium... | 07/18/1978 |
| 4039324 | Fluidized hydrogen reduction process for the recovery of copper Copper is recovered from copper salts, e.g. cuprous chloride, by means of a process comprising reducing the copper salts with hydrogen in a fluidized bed in the presence of chemically inert, generally spherical, relatively smooth, non-porous particles in ... | 08/02/1977 |
| 4013457 | Process for the recovery of cuprous chloride in the presence of metal impurities A process is disclosed for separating cuprous chloride from a solution comprising cuprous chloride and one or more of a number of metal impurities, the process comprising crystallizing the cuprous chloride from the solution in the presence of copper as cu... | 03/22/1977 |
| 4011146 | Process for separation and recovery of metal values from sulfide ore concentrates An improvement in conventional processes for recovering metal values from sulfide ores containing lead, zinc and silver sulfides in which process the metal sulfides are converted to chlorides by chlorination followed by solubilization of the chlorides wit... | 03/08/1977 |
| 3973949 | Zinc recovery by chlorination leach A pollution-free process for the recovery of high purity zinc from zinc containing material including sulfide ores which provides for maximum conservation and re-use of reagents, the process consisting of chlorinating the materials either with ferric chlo... | 08/10/1976 |
| 3957602 | Recovery of copper from chalcopyrite utilizing copper sulfate leach Copper is recovered from chalcopyrite by means of a pollution-free hydrometallurgical process which entails leaching and converting the chalcopyrite with copper sulfate in order to produce an insoluble copper sulfide, a soluble iron sulfate and sulfuric a... | 05/18/1976 |
| 3939256 | Sulfur recovery process A method for the separation and recovery of elemental sulfur from mixtures of foreign material and sulfur which comprises washing the foreign material and sulfur mixture to remove impurities which are deleterious to coalescence of the sulfur particles fol... | 02/17/1976 |
| 3930969 | Process for oxidizing metal sulfides to elemental sulfur using activated carbon Accelerated reaction rates and improved yields are accomplished when sulfides of metals of groups Ib, IIb, IVa, Va and VIII of the Periodic Table are oxidized in aqueous medium to convert the sulfide sulfur to elemental sulfur by performing the reaction i... | 01/06/1976 |
