| Patents for C22B 19 - Obtaining zinc or zinc oxide (2,969) |
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| 10/26/2004 | CA2167729C Process for the extraction of zinc from sulphide concentrates |
| 10/20/2004 | EP1468122A1 Method for the separation of zinc and a second metal which does not form an anionic complex in the presence of chloride ions |
| 10/19/2004 | US6805833 Apparatus for enhanced purification of high-purity metals |
| 10/13/2004 | EP1189715B1 Zinc-based metal foamed bodies |
| 09/30/2004 | US20040187643 Method for obtaining cobalt and nickel from ores and ore concentrates |
| 09/30/2004 | DE102004013531A1 Verfahren zur Wiederaufbereitung von Altbatterien Method for recycling of waste batteries |
| 09/23/2004 | WO2004081242A1 Recovery of metals from industrial dusts |
| 09/22/2004 | EP1251940B1 A method for treatment of flue gas cleaning products |
| 09/08/2004 | EP1454376A2 Recycling used electric cells by hydrometallurgical treatment |
| 08/31/2004 | US6783744 For recovery of high purity zinc oxide products and optionally iron carbon feedstocks from industrial waste streams containing zinc oxide and/or iron; waste streams treated by adding carbon and ammonium chloride displacing undesired metal |
| 08/26/2004 | US20040166016 High-purity metal |
| 08/24/2004 | US6780222 Method of sintering and sinter bed composition |
| 08/10/2004 | US6773485 Method for recovering catalytic metals using a porous metal filter |
| 08/10/2004 | CA2256135C Method of producing reduced iron pellets |
| 08/03/2004 | US6770249 Hydrometallurgical process utilizing an atmospheric calcium chloride leach to selectively recover from various metal feed stocks |
| 07/28/2004 | CN2628538Y Efficient zinc white furnace |
| 07/14/2004 | EP1200633A4 $i(THLASPI CAERULESCENS) SUBSPECIES FOR CADMIUM AND ZINC RECOVERY |
| 07/07/2004 | EP1434893A1 Zinc recovery process |
| 07/07/2004 | EP1434892A1 Chloride melt process for the separation and recovery of zinc |
| 06/30/2004 | CN2622196Y Zinc white furnace using direct and continuous method for prodn. of zinc oxide |
| 06/30/2004 | CN1509339A Apparatus and method for recycling iron laden dust and sludge in ingot iron manufacturing process using semi-soft coking coal and fine iron ore |
| 06/22/2004 | CA2306015C A method of purifying acid leaching solution |
| 06/17/2004 | WO2003021708A3 Recycling used electric cells by hydrometallurgical treatment |
| 06/16/2004 | CN1505688A Arrangement and method for reducing build-up on a roasting furnace grate |
| 06/16/2004 | CN1153837C Process for smelting zinc |
| 06/09/2004 | EP1425428A2 Method for obtaining cobalt and nickel from ores and ore concentrates |
| 06/09/2004 | CN1503850A Method for producing large diameter ingots of nickel base alloys |
| 06/09/2004 | CN1502711A Technology and apparatus for producing greater than 99% grade zinc oxide by rotary kiln |
| 05/26/2004 | EP1422303A1 Method of producing metal foam bodies of Zn-alloys |
| 05/26/2004 | CN2617777Y Zinc charger of small zinc rectifying furnace |
| 05/18/2004 | US6736877 Heap bioleaching process for the extraction of zinc |
| 05/13/2004 | US20040091014 Dual use of an induction furnace to produce hot metal or pig iron while processing iron and volatile metal containing materials |
| 05/13/2004 | US20040089986 Apparatus for metal purification |
| 05/13/2004 | US20040089103 Method for the removal of calcium from a zinc process sulfate solution |
| 05/12/2004 | CN1496415A A method for precipitation of silica in connection with zinc ore leaching |
| 05/12/2004 | CN1496414A A method for removal of calcium from zinc frocess sulfate solution |
| 05/06/2004 | US20040086820 To reduce and remove the build-up formed on the fluidized bed grate in the roasting of fine-grained material by increasing the feed of gas using extra gas jets situated above the grate |
| 05/06/2004 | US20040083854 Method and apparatus for enhanced purification of high-purity metals |
| 04/29/2004 | WO2004035846A1 The non-pollution process of extracting arsenic in vacuum and the equipment thereof |
| 04/29/2004 | WO2004035845A1 Process and apparatus for extracting zinc |
| 04/29/2004 | WO2004035844A1 The process for extracting gold in arsenic-containing concerntrate of gold and the equipment thereof |
| 04/29/2004 | US20040081603 Beneficiation process for concentration/calcination of zinc silicate ores minerales |
| 04/28/2004 | CN1492948A Method for electrolytic production of ultra-pure zinc or zinc compounds from zinc primary and secondary raw materials |
| 04/27/2004 | US6726889 Production of zinc oxide from acid soluble ore using precipitation method |
| 04/27/2004 | US6726887 Composition of oxime and hydroxy-ester for the solvent extraction of metals |
| 04/27/2004 | CA2252599C Fluidized bed roasting process |
| 04/22/2004 | US20040074340 Method for the precipation of silica in connection with zinc ore leaching |
| 04/21/2004 | CN1490420A Vacuum arsenic extracting method and system without pollution |
| 04/21/2004 | CN1490418A Method and system for extracting gold from arsenic contained headings |
| 04/15/2004 | US20040071619 Method for the purification of zinc oxide controlling particle size |
| 04/14/2004 | EP1129227B1 Device and method for removing dross from a vessel of molten zinc with enhanced zinc yield |
| 04/13/2004 | US6719858 Large diameter ingots of nickel base alloys |
| 04/08/2004 | US20040065987 Apparatus for leaching zinc concentrates |
| 04/07/2004 | CN1488004A Improved beneficiation process for concentration/calcination of zinc silicate ores and minerals |
| 04/01/2004 | US20040060394 Motor driven agitator shaft having paddles is rotated within the skimmings processing chamber so that the ends of the paddles enter the molten zinc during each shaft revolution and enhance melting and recovery; reduced emissions |
| 04/01/2004 | US20040060393 Concentrate fed into furnace from wall of furnace; oxygen-containing gas fed via gas nozzles under grate in bottom of furnace to fluidize the concentrate and oxidize it during fluidization |
| 03/25/2004 | WO2004024961A1 Method for reduction treatment of metal oxide or ironmaking waste, and method for concentration and/or recovery of zinc and/or lead |
| 03/25/2004 | WO2004024960A1 Method for producing a zinc-containing sinter for use as feedstock for thermal zinc extraction |
| 03/18/2004 | US20040050210 Charging the dusts into a bath of molten metals and liquid oxidic slags, volatile heavy metal compounds such as zinc and/or lead oxides are separated from gas phase and alkalies are introduced into the slags |
| 03/18/2004 | US20040050209 Method for the stabilization of a fluidized bed in a roasting furnace |
| 03/18/2004 | DE10240766A1 Production of a zinc-containing sinter used as feed material for the thermal recovery of zinc comprises sintering a zinc-containing secondary raw material to which a sulfur-containing secondary energy carrier has been added |
| 03/11/2004 | WO2004020678A1 Removal of carbonaceous materials and magnesium from zinc silicate flotation concentrate by treatment in autoclave with zinc-bearing spent solution |
| 03/11/2004 | US20040047780 Extraction of a base metal such as Ni, Co or Zn, from a sulphide ore or concentrate containing copper and the base metal comprises the step of subjecting the ore or concentrate to pressure oxidation in the presence of oxygen and an acidic |
| 03/03/2004 | EP1119646B1 Liquid carton waste material recycling process and apparatus |
| 03/02/2004 | US6699302 High metal or alloy recoveries; producing very clean slags |
| 02/26/2004 | DE10240224A1 Process for the thermal recovery of zinc comprises adding a zinc-containing secondary raw material as feed material in the form of molded bricks to a shaft kiln |
| 02/24/2004 | US6696037 Method of recovering sulfur from minerals and other sulfur-containing compounds |
| 02/24/2004 | US6696029 Method for the purification of zinc oxide controlling particle size |
| 02/19/2004 | US20040031356 Process for electrolytic production of ultra-pure zinc or zinc compounds from zinc primary and secondary raw materials |
| 02/12/2004 | US20040025638 Flushing zinc under protective coating of zinc chloride |
| 02/11/2004 | CN2602853Y Zinc powder preparation device |
| 02/11/2004 | CN1474879A Method for stabilization of fluidized bed in roasting furnace |
| 02/11/2004 | CN1474878A Method for reducing build-up on roasting furnace grate |
| 01/27/2004 | US6682586 Assemblies and methods for processing zinc-bearing materials |
| 01/22/2004 | US20040014589 Method for removing impurities from solvent extraction solutions |
| 01/14/2004 | CN1134548C Zinc oxide producing method from slag of zinc white furnace |
| 01/08/2004 | US20040003681 Method for recovering catalytic metals using a porous metal filter |
| 01/07/2004 | EP1377690A1 Method for producing large diameter ingots of nickel base alloys |
| 01/02/2004 | EP1375686A1 Method of producing stainless steel by re-using waste material of a stainless steel producing process |
| 12/31/2003 | WO2004001077A1 A method of extracting at least zinc oxide from a material and a plant for use therein |
| 12/30/2003 | US6669894 Roaster with stabilized fluidized bed for roasting zinc concentrate |
| 12/25/2003 | US20030233912 Method of producing stainless steel by re-using waste material of stainless steel producing process |
| 12/24/2003 | WO2003089674A3 Acid beneficiation of ore |
| 12/24/2003 | CN2594275Y 石墨坩埚组件 Graphite crucible assembly |
| 12/17/2003 | EP1371739A1 Process for purifying zinc and rectifying column for purifying zinc |
| 12/17/2003 | EP1370699A1 A method for the precipitation of silica in connection with zinc ore leaching |
| 12/10/2003 | CN2591539Y Zinc steam condensing recovery preheating energy-saving system |
| 12/04/2003 | WO2003100105A1 Chloride assisted hydrometallurgical extraction of metals |
| 12/04/2003 | WO2003099916A1 Method for removing heavy metals from a polymer substrate |
| 12/03/2003 | EP1366201A1 A method for the removal of calcium from a zinc process sulfate solution |
| 12/03/2003 | EP1366200A1 Arrangement and method for reducing build-up on a roasting furnace grate |
| 12/02/2003 | US6656415 Process and device for precipitating compounds from zinc metal baths by means of a hollow rotary body that can be driven about an axis and is dipped into the molten zinc |
| 11/26/2003 | CN1458305A ZnO nano crystal whisker material and its preparing method |
| 11/12/2003 | EP1361296A1 Method for electrolytic production of ultra-pure zinc or zinc compounds from zinc primary and secondary raw materials |
| 11/12/2003 | CN1127577C Process and apparatus of directly producing high-grade zinc oxide |
| 11/04/2003 | US6641392 Method for regulating a roasting furnace |
| 10/30/2003 | WO2003089674A2 Acid beneficiation of ore |
| 10/23/2003 | US20030198591 Acid benefication of ore |
| 10/22/2003 | CN2581462Y Double vacuum purifier for hot-galvanizing zinc residue regenerating |
| 10/15/2003 | CN1448523A Process of producing zinc oxide by smelting in rotary kiln |