| Patents for C22B 3 - Extraction of metal compounds from ores or concentrates by wet processes (16,429) |
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| 08/25/1999 | CN1044823C Process for activating and dissolving sulfide ores containing gold |
| 08/24/1999 | US5942198 Mixing flue dust with coal fines forming briquettes and adding to final furnace batch to form zinc containing dust; dissolving zinc containing dust forming intermediate solution; filtering, precipitating and filtering zinc oxide |
| 08/24/1999 | US5942024 Solvent extracting from gold bearing chlorination leach solution with dibutyl carbitol, scrubbing with hydrochloric acid, centrifuging, filtering, reducing gold |
| 08/18/1999 | EP0752013B1 Hydrometallurgical extraction process |
| 08/18/1999 | CN1226286A Method and apparatus for back-extracting metal chelates |
| 08/17/1999 | US5939034 Complexing with the quanidyl or the quaternary amine extractants, stripping with aqueous stripping solution and demetallization |
| 08/11/1999 | EP0935005A1 Process for treating metallic dust, mostly oxididised waste, in particular galvanising dust and/or steelworks smoke |
| 08/11/1999 | CN1044619C Method for extracting gold from coal-oil gold carried aggregate |
| 08/10/1999 | US5935546 Method for removing traces of heavy metals from concentrated alkali metal chloride solutions down into the range of 0.01 ppm |
| 08/10/1999 | US5935409 Fluoboric acid control in a ferric fluoborate hydrometallurgical process for recovering metals |
| 08/04/1999 | EP0836523A4 Process for making shaped copper articles |
| 08/04/1999 | CN1225075A Process for preparing pure alkali and/or ammonium tungstate solutions |
| 07/28/1999 | EP0931168A1 Use of hydrocarbon-soluble aminomethylenephosphonic acid derivatives for the solvent extraction of metal ions from aqueous solutions |
| 07/28/1999 | EP0703993B1 Method for treatment of residues from organochlorosilane and/or chlorosilansynthesis |
| 07/28/1999 | CN1224066A Biochemical oxidation system and process |
| 07/27/1999 | US5928517 Complexing target metal in solid matrix with polymer in aqueous solution, separating leached solid, ultrafiltration to concentrate complex, then decomplexing to recover metal and polymer |
| 07/27/1999 | US5928406 Conversion of metal oxidation states by phytoreduction |
| 07/21/1999 | EP0930373A1 Recovery of nickel and/or cobalt from a hydroxide concentrate with an ammonium leach solution |
| 07/21/1999 | EP0930372A1 Use of alkxoylated alcoholes or amines as modifiers in the seperation of metalions from aqueous solutions by solvent-extraction |
| 07/20/1999 | US5925784 Bis (1,1,3,3-tetramethylbutyl) phosphinic acid compound, a production method thereof and an extracting agent |
| 07/19/1999 | CA2224116A1 Zirconium and hafnium separation in chloride solutions using continuous ion exchange chromatography |
| 07/19/1999 | CA2224090A1 Zirconium and hafnium separation in sulfate solutions using continuous ion exchange chromatography |
| 07/14/1999 | CN1044136C Method for preparing rare-earth from mixed rare-earth mineral |
| 07/08/1999 | DE19858560A1 Caustic soda stripping of rare earth-loaded liquid ion exchanger used in solvent extraction |
| 07/06/1999 | US5919948 Asymmetric ligands useful for transition metal catalyzed bond forming reactions and epoxide reactions therewith |
| 07/06/1999 | US5919674 Copper recovery |
| 07/01/1999 | WO1999032675A1 A process for recovering zinc values as complex zinc cyanide solution and use of the same for stripping copper from loaded anion exchange material |
| 06/30/1999 | EP0483266B1 Method of making zinc stannates |
| 06/30/1999 | CN1221458A Method for lowering oxygen content in valve metal materials |
| 06/29/1999 | US5917117 Inducing hyperaccumulation of metals in plant shoots |
| 06/29/1999 | US5916534 Solubilizing base metal in slurry by adding solubilizing agents |
| 06/29/1999 | CA2150076C Bead for removing dissolved metal contaminants |
| 06/24/1999 | WO1999031285A1 Oxidising elutriation of contaminated sludge containing iron with separation of zinc and lead |
| 06/24/1999 | CA2312037A1 Oxidising elutriation of contaminated sludge containing iron with separation of zinc and lead |
| 06/23/1999 | EP0924307A1 Solvent extraction of cobalt and nickel values from a magnesium containing solution |
| 06/23/1999 | CN1220319A Improved beta-diketones for extraction of copper from aqueous ammoniacal solutions |
| 06/23/1999 | CN1220318A Formula for purifying gold and gold purifying method using fast wet method |
| 06/23/1999 | CN1043788C Method for leaching earthy cobalt |
| 06/23/1999 | CN1043787C Technical process for extracting valuable metal from gold slime |
| 06/22/1999 | US5914441 Aerobic biooxidation to form ferric ion solution in first bioreactor, then anaerobically exposing metal sulfide ore to ferric ions and sulfur-oxidizing bacterium in second bioreactor to release gold |
| 06/19/1999 | CA2225370A1 A process for recovering zinc values |
| 06/17/1999 | WO1999024396A8 Ion binding compounds, radionuclide complexes, methods of making radionuclide complexes, methods of extracting radionucleides, and methods of delivering radionuclides to target locations |
| 06/17/1999 | CA2243925A1 Improved beta-diketones for the extraction of copper from aqueous ammoniacal solutions |
| 06/16/1999 | CN1219980A Recovery method of metal values from solids by digestion in sulfuric acid medium including reductant |
| 06/16/1999 | CN1219979A Method for solubilizing metal values from Ta-Nb-ore materials containing insoluble fluorides |
| 06/16/1999 | CN1219978A Recovery method of metal values |
| 06/16/1999 | CN1043666C Combined transuranic-strontium extraction process |
| 06/15/1999 | US5912402 Leaching dust with water for chloride and filtration, reaction with nitric acid, precipitation of iron and demetallization |
| 06/10/1999 | WO1999028514A1 Bioremediation of waste streams containing dissolved metals such as neptunium by two-stage bio-reduction/extraction |
| 06/10/1999 | WO1999028286A1 Process to separate rhodium from an organic mixture |
| 06/10/1999 | CA2312328A1 Process to separate rhodium from an organic mixture |
| 06/09/1999 | EP0853648B1 Method for preparing inorganic pigments, resulting inorganic pigments, and apparatus therefor |
| 06/02/1999 | EP0919534A1 Process to separate rhodium from an organic mixture |
| 06/02/1999 | CN1218418A Method and apparatus for conducting the two solutions of liquid-liquid extraction, mixed into dispersion, in controlled fashion into separation part |
| 06/02/1999 | CN1218113A Method for treating and recovering emulsion phase in extracting separation of raw rare earth materials |
| 06/01/1999 | US5908605 Extraction of aqueous ammoniacal solutions containing copper values; beta-diketone copper extractant; aqueous acidic stripping solution; hydroxy oxime in a catalytic amount |
| 06/01/1999 | US5908489 Process for removing antimony from hydrofluoric acid solutions which contain Ta/Nb |
| 05/26/1999 | EP0918094A1 Hydrometallurgical process for the recovery of nickel and cobalt by ammoniacal leaching |
| 05/26/1999 | EP0917541A1 Biodegradable complexing agents for heavy metals |
| 05/26/1999 | CN1217387A Antimicelle method of solvent extraction for preparing superfine powder of metal oxide and use thereof |
| 05/25/1999 | US5906749 Method for recovering metals from solutions |
| 05/25/1999 | CA2104437C Method for purifying aqueous phases in hydrometallurigical extractions |
| 05/20/1999 | WO1999024396A1 Ion binding compounds, radionuclide complexes, methods of making radionuclide complexes, methods of extracting radionucleides, and methods of delivering radionuclides to target locations |
| 05/19/1999 | EP0915727A1 Process for the recovery of nickel |
| 05/19/1999 | EP0766749B1 Use of hydrocarbon-soluble aminomethylene phosphonic acid derivatives in the solvent extraction of iron ions from aqueous solutions |
| 05/19/1999 | CN1217004A Integral multi-layered ion-exchange composite membranes |
| 05/19/1999 | CN1216933A Method and apparatus for recirculating a heavier solution from the separation part of two separable solutions into a mixing unit |
| 05/19/1999 | CN1216932A Method and apparatus for adjustion the boundary surface between two conducting both solution out of the separation part |
| 05/14/1999 | WO1999023263A1 Method for removing contaminants from process streams in metal recovery processes |
| 05/14/1999 | WO1999022933A1 System for extracting soluble heavy metals from liquid solutions |
| 05/12/1999 | EP0914482A1 Method and apparatus for back-extracting metal chelates |
| 05/12/1999 | CN1216324A Separation and enrichment process of minute amount of noble metal elements in solution by utilizing carrying fiber column |
| 05/11/1999 | US5902977 Flotation cell and method |
| 05/11/1999 | US5902474 Chloride assisted hydrometallurgical extraction of metal |
| 05/06/1999 | DE19807864C1 Permeative separation of palladium and platinum complex compounds |
| 05/05/1999 | CN1215758A Method for bacteria preoxidation extraction of gold from refractory high-arsenic gold-ore and bacteria oxidation tank used |
| 05/05/1999 | CN1043248C Hydrometallurgical recovery of metals from complex ores |
| 05/05/1999 | CN1043247C Recovery of noble metal |
| 05/04/1999 | US5900042 Treating gaseous emissions with aqueous oxidizing solutions to form soluble mercury compounds, then scrubbing with aqueous solution to remove compounds |
| 05/04/1999 | US5900041 Ion exchanging |
| 04/29/1999 | WO1999020803A1 Polymeric combinations used as copper and precious metal heap leaching agglomeration aids |
| 04/29/1999 | CA2274672A1 Polymeric combinations used as copper and precious metal heap leaching agglomeration aids |
| 04/28/1999 | EP0910616A1 Process for removal of organo-sulfur compounds from liquid hydrocarbons |
| 04/28/1999 | CN1043156C Rare earth electrolytic extracting process and reactor thereof |
| 04/28/1999 | CN1043155C Technological process of lithium hydroxide from lithionite and lime stone by sintering |
| 04/28/1999 | CN1043154C Method for upgrading titaniferous materials |
| 04/27/1999 | US5897685 Recycling of CdTe photovoltaic waste |
| 04/27/1999 | US5896997 Dynamic mining system comprising hydrated multiple recovery sites and related methods |
| 04/22/1999 | WO1999019523A1 A fibrous system including wicking fibers impregnated with extractant for continuously capturing metals from an aqueous stream |
| 04/21/1999 | EP0909447A1 Method for cesium removal from radioactive waste liquids and method for producing hexacyanoferrates |
| 04/21/1999 | EP0909336A1 Process for recovery of zinc from sphalerite containing ores or concentrates |
| 04/21/1999 | EP0909335A1 Treatment of fly ash/apc residues including lead salt recovery |
| 04/21/1999 | CN1043013C Iron-exchange recovery method of cobalt and manganese ions in acetate solution |
| 04/20/1999 | US5895832 Process for the treatment of contaminated material |
| 04/20/1999 | US5895633 Solvent extraction process for recovering copper from copper-containing solutions |
| 04/14/1999 | EP0908525A1 Process for the recovery of metals. |
| 04/14/1999 | EP0879301A4 Improved beta-diketones for the extraction of copper from aqueous ammoniacal solutions |
| 04/14/1999 | CN1042957C Method for extracting silver and gold in difficult infusion independent silver mine by flotating silver concentrate ore |
| 04/07/1999 | EP0906962A1 Interseparation of platinum group metals |
| 04/07/1999 | CN1213007A Method and system for extracting noble metal adsorbed on active carbon |