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Class Information
Number: 423/43
Name: Chemistry of inorganic compounds > Treating mixture to obtain metal containing compound > Group ib metal (cu, ag, or au) > Forming insoluble substance in liquid > Specified ph
Description: Processes in which specific alkalinity or acidity is employed during the process.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8568670 Process for producing basic lead carbonate Oct. 29, 2013
8540950 Method for the removal of chloride from zinc sulphate solution Sep. 24, 2013
8323510 Ultrasound assisted heavy metal recovery Dec. 4, 2012
8070851 Chloride heap leaching Dec. 6, 2011
7892505 Hydrometallurgical process for the treatment of metal-bearing sulfide mineral concentrates Feb. 22, 2011
7862786 Selective precipitation of metal sulfides Jan. 4, 2011
7749470 Method for processing waste copper liquid to produce high copper content sludge Jul. 6, 2010
7615199 Method for the recovery of valuable metals and arsenic from a solution Nov. 10, 2009
7537741 Gold and silver recovery from polymetallic sulfides by treatment with halogens May. 26, 2009
7351343 Copper metal recovery system Apr. 1, 2008
7226573 Fine-grain silver oxide powder Jun. 5, 2007
6649131 Preparation of highly pure copper oxide from waste etchant Nov. 18, 2003
6596246 Process for producing stable cupric hydroxide and basic cupric salts Jul. 22, 2003
6485629 Process for separation of heavy metals from residues by use of ethylene-diamine-disuccinic acid (edds) complexant Nov. 26, 2002
6485696 Recovery/removal of metallic elements from waste water using ozone Nov. 26, 2002
6454828 Method of producing zinc diammine chloride and uses for same Sep. 24, 2002
6440194 Recovery of precious metals from metal alloys produced aluminothermically from base metal smelter slag Aug. 27, 2002
6342189 Method for total precipitation of valuable metals from an acid leaching solution Jan. 29, 2002
5980856 Synthetic chalcoalumite-type compounds and processes for producing the same Nov. 9, 1999
5961939 Process for recovery of silver from hardening photoprocessing solutions Oct. 5, 1999
5741347 Method for producing copper powder Apr. 21, 1998
5524780 Control of regeneration of ammoniacal copper etchant Jun. 11, 1996
5443619 Process for extracting metals from solution Aug. 22, 1995
5320759 Selective recovery of heavy metals using xanthates Jun. 14, 1994
5308501 Treatment system for alkaline or acidic solution containing heavy metals May. 3, 1994
5262063 Multiple-stage precipitation process for heavy metals in aqueous solution Nov. 16, 1993
5248441 Process for the recovery of copper from copper-containing industrial waste waters Sep. 28, 1993
5178842 Method for precipitating and separating metals Jan. 12, 1993
5173276 Method for recovery of copper from copper-containing materials Dec. 22, 1992
5098578 Treatment of geothermal brine Mar. 24, 1992
5059403 Method for producing copper sulfate from waste copper-containing liquid Oct. 22, 1991
5009793 Process for the separation of heavy metals from waste materials Apr. 23, 1991
5002748 Method for the preparation of copper arsenate Mar. 26, 1991
4971775 Process for removal of nickel from effluent containing EDTA Nov. 20, 1990
4959203 Preparation of copper arsenate Sep. 25, 1990
4954265 Method of processing spent electroless bath and bath for use therein Sep. 4, 1990
4943377 Method for removing dissolved heavy metals from waste oils, industrial wastewaters, or any polar solvent Jul. 24, 1990
4913730 Recovery of gold from aqueous solutions Apr. 3, 1990
4904459 Process for working up dusts which are produced in the electrothermal production of phosphorus Feb. 27, 1990
4859293 Process for refining gold and apparatus employed therefor Aug. 22, 1989
4828809 Separation of nickel from copper in autoclave May. 9, 1989
4808406 Preparation of cupric hydroxide compositions Feb. 28, 1989
4778519 Recovery of precious metals from a thiourea leach Oct. 18, 1988
4681628 Gold Recovery processes Jul. 21, 1987
4511540 Exploitation of copper, nickel and cobalt by treating manganiferous matrix oxidized ores Apr. 16, 1985
4509616 Acoustical liners Apr. 9, 1985
4490337 Preparation of cupric hydroxide Dec. 25, 1984
4428773 Process for treating spent fluids to recover copper and copper oxide Jan. 31, 1984
4419246 Removal of heavy metal ions Dec. 6, 1983
4405570 Removal of dissolved cadmium and copper from sulphate solution with hydrogen sulfide Sep. 20, 1983

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