C - Chemistry – Metallurgy – 01 – G
Patent
C - Chemistry, Metallurgy
01
G
53/314, 204/74,
C01G 9/06 (2006.01)
Patent
CA 1046288
"PURIFICATION OF ZINC SULPHATE SOLUTIONS" ABSTRACT OF THE DISCLOSURE: A method is provided for purifying zinc sulphate solutions containing copper, cadmium and cobalt impurities, which comprises, in a first stage, treating the impure zinc sulphate solution with zinc dust and an antimony or arsenic compound so as to form a cement containing essentially all the copper and cadmium and a portion of the cobalt and separating this cement from the partially purified solution, then, in a second stage, treating the partially purified solution with zinc dust and an antimony or arsenic compound to form a cement containing essentially metallic zinc as well as the remaining cobalt and other incidental impurities and separating this cement from the purified solution and recycling at least the major portion of this cement to the first stage where it is used instead of zinc dust to effect further treatment of a fresh impure zinc sulphate solution. The purified solution from the second stage may also be subjected to a third purifi- cation stage for control purposes. This method provides an improved procedure for the purification of zinc sulphate solutions.
218818
Na
Noranda Mines Limited
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