C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/66
C25C 1/00 (2006.01) C25C 1/12 (2006.01)
Patent
CA 1191812
ABSTRACT OF THE DISCLOSURE The invention relates to a process for the recovery of elemental metal values from ores and processing liquids by solvent extraction-eletrowinning. The process involves extracting metal values by means of an aqueous strip solu- tion containing strong acid such as sulphuric or phosphoric acid. The aqueous strip solution containing the metal values is used as electrolyte in an electro- plating process to electrowin the metal values. A problem which has arisen is that oxygen evolved at the anode during electroplating entrains the strong acid electrolyte, to form a fine mist or spray which is corrosive and constitutes a health hazard. In the present invention, the aqueous strip solution contains from 1 to 200 parts by weight of fluoroaliphatic surfactant, per million parts of strip solution, the surfactant having at least one cationogenic group which is the radical of a base having an ionization constant in water at 25°C of at least 10-6, and containing at least 30 weight percent fluorine in the form of carbon-bonded fluorine in a fluoroaliphatic radical, said fluoroaliphatic radi- cal having at least 4 carbon atoms and at least a terminal perfluoromethyl group. The invention inhibits or suppresses acidic mist formation above electrowinning tanks.
378238
Bultman David A.
Olson Maynard H.
Minnesota Mining And Manufacturing Company
Smart & Biggar
LandOfFree
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