| Patents for C22B 30 - Obtaining antimony, arsenic or bismuth (1,043) |
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| 05/19/1992 | US5114592 Procedure for separating arsenic from waste material |
| 05/05/1992 | US5110353 Process for the recovery and separation of arsenic from antimony |
| 09/18/1991 | CN2084938U Dual-purpose arsenic extracting furnace |
| 08/22/1991 | DE4005026A1 Removing gold and silver from antimony ores - by reacting with ammonia under oxygen pressure and high temp. to remove noble metals in soln. |
| 06/19/1991 | CN1052335A Dual-purpose arsenic melting furnace |
| 06/13/1991 | WO1991008318A1 Metal oxide production by leaching and hydrolysis |
| 03/06/1991 | CN1049685A Removal of selenium from antimony |
| 02/12/1991 | CA1279995C Recovery of metals from their alloys with lead |
| 01/23/1991 | EP0276209B1 Process for separating arsenic from acid solutions which contain it |
| 12/05/1990 | CN1010697B Lead-antimony raw alloy centrifugal segregation |
| 11/28/1990 | EP0399035A1 Method of removing arsenic and/or other amphoteric elements from sludge and solid waste materials. |
| 10/03/1990 | EP0389661A1 Process for removing arsenic from waste waters |
| 09/19/1990 | CN1045379A Internal heating process and equipment for obtaining as |
| 08/09/1990 | DE3903590A1 Method of reprocessing used DeNOx catalysts |
| 06/28/1990 | WO1990006820A1 Method of removing arsenic and/or other amphoteric elements from sludge and solid waste materials |
| 02/21/1990 | CN1006882B Wet process for producing sodium pyroantimonate |
| 01/03/1990 | CN1006304B Method of mfg. sb203 with metal antimony |
| 01/02/1990 | US4891061 Process for treating speiss |
| 12/27/1989 | CN1006234B Antimong ore treatment and the equipment |
| 12/19/1989 | US4888207 Recovery of arsenic from ores and concentrates |
| 11/28/1989 | CA1263239A1 Process for separating arsenic from acid solutions which contain it |
| 03/08/1989 | CN1031568A Lead-antimony raw alloy centrifugal segregation |
| 03/08/1989 | CN1031565A Vacuum extraction of silver, bismuth and zinc from bismuth-silver-zinc-containing shell |
| 02/28/1989 | US4808221 Oxidizing and separating products |
| 02/22/1989 | CN1031214A Technology of smelting low grade antimony oxide ore |
| 12/28/1988 | CN87102039A Antimony and gold smelting technology |
| 11/15/1988 | CA1244655A1 Method for recovering the valuable metal content of contaminated copper raw material |
| 10/11/1988 | US4777028 Process for freeing mineral acids from heavy metals |
| 08/03/1988 | EP0276209A1 Process for separating arsenic from acid solutions which contain it. |
| 07/06/1988 | CN85107157B Wet process for extracting white arsenic from smoke dust containing arsenic |
| 06/15/1988 | CN85107329B Chlorination-hydrolyzation process for making antimony white from antimony sulfide ore |
| 06/14/1988 | US4751063 Process for treating spent catalyst including antimony halides from chlorofluorocarbon production |
| 04/20/1988 | CN86106432A Technology and equipment for stibium smelting at low temp. |
| 04/12/1988 | US4737350 Process for separating arsenic from acid solutions which contain it |
| 03/29/1988 | US4734129 Oxidizing lead to form lead oxide slag |
| 02/02/1988 | US4722774 Recovery or arsenic and antimony from spent antimony catalyst |
| 01/13/1988 | CN86107466A Electrical chlorination stibium abstracting from stibiconite |
| 12/16/1987 | CN86104335A Method for direct extracting antimony oxide from low grade antimony sulphide ore |
| 11/03/1987 | CA1228734A1 Process for the separation of arsenic from acid solutions containing it |
| 09/22/1987 | CA1227041A1 Method for recovering metal values from materials containing copper and/or precious metals |
| 08/19/1987 | EP0232766A2 Process for eliminating heavy metals from mineral acids |
| 08/12/1987 | CN86100297A Antimony ore pretreatment with a submerged combustor |
| 06/02/1987 | CA1222380A1 Method for processing copper smelting materials and the like containing high percentages of arsenic and/or antimony |
| 05/13/1987 | EP0221760A2 Method for recovering metal values from mixed-metal aqueous solutions by selective phosphate precipitation |
| 04/23/1987 | DE3539164C1 Process and smelting furnace for producing non-ferrous metals |
| 04/01/1987 | CN85107157A Wet process for extracting white arsenic from smoke dust containing arsenic |
| 02/12/1987 | WO1987000867A1 Process for separating arsenic from acid solutions which contain it |
| 01/24/1987 | CN86104236A Method and installations for smelting crude antimony in ground furnace |
| 01/17/1987 | CN85102490A Wet process for producing sodium pyroantimonate |
| 01/17/1987 | CN85102489A Method of mfg. sb2o3 with metal antimony |
| 01/07/1987 | EP0207656A1 Recovery of metals from their alloys with lead |
| 01/06/1987 | US4634579 Precipitation |
| 12/16/1986 | US4629501 Method for manufacture of antimony of high purity |
| 12/02/1986 | US4626279 Decomposition at low temperatures in the presence of oxygen |
| 10/08/1986 | CN85109691A New energy-saving and nonpolluting process for antimony-smelting |
| 09/16/1986 | US4612171 Method for recovering metal values from materials containing copper and/or precious metals |
| 08/26/1986 | US4608083 Method for recovering the valuable metal content of contaminated copper raw material |
| 07/09/1986 | CN85107329A Chlorination-hydrolyzation process for making antimony white from antimony sulfide ore |
| 07/08/1986 | CA1207152A1 Process for recovering metals of high commercial value contained in a mud |
| 04/09/1986 | EP0177471A1 A method for recovering the valuable metal content of contaminated copper raw material |
| 03/25/1986 | US4578254 Process for the refining of sulfidic concentrates which contain arsenic, antimony and bismuth |
| 03/11/1986 | CA1201593A1 Selective removal of arsenical materials in the alkaline treatment of uranium and/or molybdenum containing ores, with a magnesium compound |
| 10/15/1985 | US4547346 Process for the separation of arsenic from acid solutions containing it |
| 04/24/1985 | EP0138794A1 A method for recovering metal values from materials containing copper and/or precious metals |
| 03/05/1985 | CA1183329A1 Process for reclaimation of high purity selenium, tellurium, and arsenic from scrap alloys |
| 02/26/1985 | US4501666 Contacting with a phosphomethylaminochelate resin |
| 01/02/1985 | CA1180190A Process for the removal of arsenic compounds from tungsten or molybdenum concentrates |
| 12/19/1984 | EP0128887A1 A method for processing copper smelting materials and the like containing high percentages of arsenic and/or antimony |
| 12/18/1984 | US4489046 Arsenic trioxide |
| 12/11/1984 | CA1179147A1 Process for the extraction of arsenic from solutions containing carbonates, sulfates, possibly an alcaline hydroxide and at least one of the metals vanadium, uranium and molybdenum |
| 11/27/1984 | US4485075 Addition of lime |
| 10/16/1984 | CA1176062A1 Recovery of copper from arsenical drosses |
| 07/03/1984 | US4457776 Process for the removal of arsenic compounds from tungsten or molybdenum concentrates |
| 03/20/1984 | US4438079 Method for manufacture of arsenious anhydride |
| 03/14/1984 | EP0102754A1 Process for reclamation of high purity selenium, tellurium, and arsenic from scrap alloys |
| 12/13/1983 | US4420331 Flotation, solvent extraction |
| 10/25/1983 | US4411698 Acidification, reaction with alcohol to form metallic compounds, then reduction |
| 10/11/1983 | CA1154971A1 Method for working-up arsenic-containing waste products |
| 09/13/1983 | CA1153561A1 Separation of antimony |
| 05/24/1983 | CA1146906A1 Treating cement copper cake by acid leach and caustic leach to produce zinc arsenate |
| 03/29/1983 | CA1143572A1 Uranium ore processing |
| 02/17/1983 | WO1983000509A1 Selective purification of arsenical material during an alkaline process for the treatment of a uranium-bearing and/or molybdenum-bearing mineral by means of a magnesium compound |
| 02/15/1983 | US4374096 Uranium ore processing |
| 01/18/1983 | US4369164 Recovery of copper from arsenical drosses by ammonium arsenate leach |
| 01/11/1983 | CA1139466A1 Removal of arsenic from aqueous solutions |
| 12/28/1982 | US4366128 Removal of arsenic from aqueous solutions |
| 11/02/1982 | US4357261 Method for manufacture of a composite copper-arsenic compound mixture |
| 10/28/1982 | WO1982003620A1 Method for extracting arsenic from solutions containing alcaline carbonates, sulphate, optionally hydroxide, as well as at least one of vanadium, uranium and molybdenum metals |
| 09/28/1982 | US4351483 Separation of arsenic from fluorite ore, by means of magnetic separation and flotation of the pyrites to which it is associated |
| 08/03/1982 | US4342591 Process for the recovery of gold and/or silver and possibly bismuth contained in sulfuretted ores and/or sulfoarsenides |
| 06/08/1982 | US4333762 Low temperature, non-SO2 polluting, kettle process for the separation of antimony values from material containing sulfo-antimony compounds of copper |
| 04/06/1982 | CA1121301A1 Selective removal of bismuth and antimony from copper electrolyte by salt addition |
| 12/01/1981 | CA1113253A1 Process for the treatment of raw materials containing arsenic and metal |
| 09/30/1981 | EP0036768A1 Separation of antimony |
| 09/17/1981 | WO1981002568A1 A method for working-up arsenic-containing waste products |
| 09/08/1981 | CA1108376A1 Method of removal of arsenic from a sulfuric acid solution |
| 08/25/1981 | CA1107514A1 Process for extracting arsenic from oxidic materials |
| 05/19/1981 | CA1101224A1 Extraction of antimony from antimony sulfides bearing solids |
| 03/25/1981 | EP0025466A1 A process for the recovery of arsenic as zinc arsenate from cement copper cake and a process for the purification of an impure zinc electrolyte using zinc arsenate so obtained |
| 01/13/1981 | US4244927 Process for recovering arsenic compounds by sodium hydroxide leaching |