| Patents for C22B 19 - Obtaining zinc or zinc oxide (2,969) |
|---|
| 02/16/1999 | US5871561 Treating dusts containing zinc and/or lead in the form of oxides to a retrievable form of their respective pure metals, using reducing agents in a heat treatment furnace |
| 02/03/1999 | CN1207141A Method of processing finely divided material incorporating metal based constituents |
| 01/19/1999 | US5861091 Process for electrochemically dissolving a metal such as zinc or tin |
| 01/13/1999 | EP0776378B1 Hydrometallurgical conversion of zinc sulfide to sulfate from zinc sulfide containing ores and concentrates |
| 01/12/1999 | US5858315 Process for the extraction of zinc from sulphide concentrates |
| 01/07/1999 | EP0889141A1 Zinc oxide-containing waste processing method |
| 01/05/1999 | US5855645 Production of more concentrated iron product from industrial waste materials streams |
| 01/05/1999 | CA2052647C Dry process for refining zinc sulfide concentrates |
| 12/23/1998 | EP0885976A1 Electrowinning of high purity zinc metal from a Mn-containing leach solution preceded by cold electrolytic demanganization |
| 12/23/1998 | EP0885170A1 Method of biotreatment for solid materials in a nonstirred surface bioreactor |
| 12/23/1998 | EP0819183B1 Treatment of fly ash |
| 12/22/1998 | US5851490 Method for utilizing PH control in the recovery of metal and chemical values from industrial waste streams |
| 12/15/1998 | CA2096665C Pyrometallurgical method for recovering volatile metals from sulfidic raw materials |
| 12/08/1998 | US5846290 Method for the recovery of group IA salts during the treatment of industrial process waste streams |
| 12/08/1998 | CA2036058C Hydrometallurgic method for processing raw materials containing zinc sulphide |
| 11/18/1998 | EP0877827A1 Method for processing a powdery material, and apparatus therefor |
| 11/05/1998 | WO1998049105A1 Wastewater treatment process for vacuum degasser effluent |
| 11/04/1998 | CN1040554C Technology and equipment for coproducing zinc sulfate and lead concentrate |
| 10/29/1998 | WO1998048066A1 Method for utilizing ph control in the recovery of metal and chemical values from industrial waste streams |
| 10/29/1998 | WO1998048065A1 Method for recycling brass foundry waste |
| 10/29/1998 | WO1998048063A1 Method for the recovery of group ia salts during treatment of industrial process waste streams |
| 10/29/1998 | CA2293687A1 Method for utilizing ph control in the recovery of metal and chemical values from industrial waste streams |
| 10/14/1998 | EP0870067A1 Method of processing finely divided material incorporating metal based constituents |
| 10/07/1998 | CN1040134C Method for recovering zinc from zinc containing dust |
| 10/07/1998 | CN1040133C Method for extracting zinc from sulphurized concentrates |
| 09/29/1998 | US5814126 Descaling and cleaning metals from sidewalls of kettles that contain molten zinc |
| 09/23/1998 | CN1039921C Method for preparating zinc oxide from zinc containing material |
| 09/08/1998 | US5803949 Fluidized bed roasting process |
| 09/02/1998 | EP0795036A4 Method for producing iron feedstock |
| 08/26/1998 | CN1191521A Method of biotreatment for solid materials in nonstirred surface bioreactor |
| 08/20/1998 | WO1998036102A1 Refining zinc sulphide ores |
| 08/18/1998 | US5795482 Use of hydrocarbon-soluble aminomethylene phosphonic acid derivatives in the solvent extraction of iron ions from aqueous solutions |
| 08/11/1998 | US5792364 Wastewater treatment process for vacuum degasser effluent |
| 07/29/1998 | EP0855448A1 Operation of lead/zinc blast furnaces |
| 07/22/1998 | EP0854199A1 Decontamination of zinc-containing metallurgical residues by continuous electro-hydrometallurgical treatment in alkaline environment |
| 07/22/1998 | EP0853648A1 Method for preparing inorganic pigments, resulting inorganic pigments, and apparatus therefor |
| 07/08/1998 | CN1187220A Chloride assisted hydrometallurgical extraction of metal |
| 07/01/1998 | EP0851034A1 Method for processing zinc silicate-containing zinc crude material |
| 07/01/1998 | CN1186524A Chloride assisted hydrometallurgical extraction of nickel and cobalt from sulfide minerals |
| 07/01/1998 | CN1186523A Chloride assisted hydrometallurgical extraction of metal |
| 07/01/1998 | CN1186522A Process for recovering metals from iron oxide bearing masses |
| 06/16/1998 | US5766307 Separating and collecting zinc dust in a smelting reduction furnace by contacting a zinc oxide-containing substance, e.g.electric furnace dust, with a carbonaceous reducing agent; slurrying the furnace gas with a coolant |
| 06/10/1998 | CN1184163A Iron removing method for liquid zinc |
| 06/02/1998 | US5759503 Method for the further purification of zinc oxide |
| 05/27/1998 | EP0843741A1 Method for upgrading waste material comprising sheet metal with a zinc plating on at least one side thereof |
| 05/26/1998 | US5757843 Induction melting system including gas exhaust |
| 05/13/1998 | CN2281354Y Zinc smelting furnace with improved oxygen supplying to recover lead and cadmium by roasting |
| 05/13/1998 | CN1038348C Prodn. of metal from minerals |
| 05/07/1998 | WO1998018971A1 Method for extraction of metals and metal oxides from minerals, industrial by-products and waste materials |
| 05/07/1998 | CA2269937A1 Method for extraction of metals and metal oxides from minerals, industrial by-products and waste materials |
| 04/16/1998 | WO1998015666A1 Production process to obtain precious metals especially zinc from raw materials containing chlorine or fluorine |
| 04/08/1998 | EP0834583A1 Wet process for the entraction of zinc and other metal values form chlorine and fluorine bearing raw materials such as Waelz oxides |
| 04/01/1998 | EP0832988A1 Method of treating zinc-containing substance and apparatus therefor |
| 04/01/1998 | EP0832306A2 Chloride assisted hydrometallurgical extraction of nickel and cobalt from sulphide ores |
| 04/01/1998 | EP0832303A1 Chloride assisted hydrometallurgical extraction of metal |
| 04/01/1998 | EP0832302A1 Chloride assisted hydrometallurgical extraction of metal |
| 04/01/1998 | EP0815270A4 Atmospheric mineral leaching process |
| 03/25/1998 | CN2276846Y Equipment for producing superfine zinc powder by vacuum process |
| 03/17/1998 | US5728193 Process for recovering metals from iron oxide bearing masses |
| 02/25/1998 | EP0825268A1 Production of elemental volatile metals by thermal reduction of their oxides with the aid of another metal in a solar reactor |
| 02/25/1998 | CN1037531C Method for producing easily volatile metals, such as zinc, lead and cadmium of sulphidic raw materials |
| 02/19/1998 | WO1998006879A1 Method for leaching zinc concentrate in atmospheric conditions |
| 02/05/1998 | WO1998004755A1 'waelz' method for processing of zinc containing materials in pelletized form |
| 02/05/1998 | WO1998004752A1 Hydrometallurgical zinc recovery process and apparatus |
| 01/28/1998 | EP0821071A1 Vacuum treatment of dust exhausted from iron and steel melting furnace for recovery of lead and zinc |
| 01/27/1998 | US5711922 Preferential hydrometallurgical conversion of zinc sulfide to sulfate from zinc sulfide containing ores and concentrates |
| 01/21/1998 | EP0819183A1 Treatment of fly ash |
| 01/21/1998 | CN1170766A Method for producing high grade zinc oxide |
| 01/15/1998 | WO1998001590A1 Process for reusing dusts from metallurgical processes, such as steel converter dusts containing zinc |
| 01/07/1998 | EP0815270A1 Atmospheric mineral leaching process |
| 01/06/1998 | US5704823 Tumbling with metal powder |
| 12/31/1997 | WO1997049835A1 Process and apparatus for production of useful iron product from industrial waste streams |
| 12/31/1997 | WO1997049637A1 Beneficiation of furnace dust for the recovery of chemical and metal values |
| 12/31/1997 | CA2259423A1 Beneficiation of furnace dust for the recovery of chemical and metal values |
| 12/31/1997 | CA2259325A1 Process and apparatus for production of useful iron product from industrial waste streams |
| 12/29/1997 | EP0813614A1 Method for recovering heavy metals from acid and ammonia solutions |
| 12/29/1997 | EP0813500A1 Purification of metal containing solutions |
| 12/16/1997 | US5698759 Treatment of polyvinylchloride |
| 12/11/1997 | WO1997046722A1 Recovery of iron products from waste material streams |
| 12/11/1997 | CA2257910A1 Recovery of iron products from waste material streams |
| 12/04/1997 | WO1997045564A1 Fluidized bed treatment of eaf dust |
| 12/04/1997 | CA2256726A1 Fluidized bed treatment of eaf dust |
| 12/03/1997 | CN1166862A Method for recovering metal and chemical values |
| 11/06/1997 | WO1997041268A1 Fluidized bed roasting process |
| 11/05/1997 | EP0804624A1 Chloride assisted hydrometallurgical copper extraction |
| 11/04/1997 | US5683488 Method for producing an iron feedstock from industrial furnace waste streams |
| 10/29/1997 | EP0802884A1 Recovery of chemical values from industrial wastes |
| 10/22/1997 | CN1162649A Method for enriching noble metals and extracting zinc by vacuum vaporization |
| 10/15/1997 | EP0801136A1 Process for reducing oxidic slags or refuse incinerator ashes on a bath of molten iron alloy |
| 10/08/1997 | EP0698127B1 Recovery of metals from sulphidic material |
| 09/17/1997 | EP0795036A1 Method for producing iron feedstock |
| 09/16/1997 | US5667556 Method of reprocessing zinc- and iron oxide-containing residual material |
| 09/16/1997 | US5667555 Method for the removal of calcium by products during the production of an iron feedstock |
| 09/16/1997 | US5667553 Methods for recycling electric arc furnace dust |
| 09/12/1997 | WO1997033007A1 Process for recovery of zinc from sphalerite containing ores or concentrates |
| 09/04/1997 | WO1997032048A1 Method and apparatus for treating ironmaking dust |
| 08/21/1997 | WO1997030182A1 Zinc oxide-containing waste processing method |
| 08/13/1997 | CN1157009A Hydrometallurgical conversion of zinc sulfide to sulfate from zinc sulfide containing ores and concentrates |
| 08/07/1997 | WO1997028287A1 Method for processing a powdery material, and apparatus therefor |
| 07/29/1997 | US5651947 Recovery of zinc from sulphidic concentrates |