C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
204/89
C02F 1/46 (2006.01) C02F 1/461 (2006.01) C22B 3/46 (2006.01) C22B 34/00 (2006.01) C22B 34/22 (2006.01) C22B 60/02 (2006.01) C22B 61/00 (2006.01)
Patent
CA 1108090
ABSTRACT OF THE DISCLOSURE: The invention is concerned with an improved method of removing a variable-valency element from sewage water which contains a compound of such element, with concurrent purification of the water, by an oxidation-reduction reaction whereby the variable-valency element of such compound is reduced to a valency that permits precipitation of the element through alkalization, wherein the improvement comprises causing the sewage water to flow through a shortcircuited electrode system containing a cathode and an anode, one of which is electropositive and the other of which is electronegative, in the presence of an effective amount of a compound of an element other than the cathode element and having a more electropositive character than the anode element. The method of the invention is particularly useful for recovering vanadium from vanadium-containing sewage water originating from gallium-or treatment plants.
269179
Anic S.p.a.
Robic Robic & Associes/associates
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