C - Chemistry – Metallurgy – 25 – C
Patent
C - Chemistry, Metallurgy
25
C
204/152, 204/66.
C25C 1/22 (2006.01) C25C 7/00 (2006.01)
Patent
CA 1136577
ABSTRACT OF THE DISCLOSURE: The invention is concerned with a method and an apparatus for producing a water soluble sulphide as a by-product of the electrowinning of metals from sulphide ores. The method of the invention comprises (a) leaching the sulphide ore in a water soluble sulphide solution; (b) adding alkali to the solution of step (a); and (c) electrolysing the solution of step (b) so as to deposit metal at the cathode and obtain the water soluble sulphide. this method is carried out according to the invention in an ap- paratus which comprises (i) at least one primary leaching tank wherein the sulphide ore is leached in the presence of a water soluble sulphide; (ii) at least one secondary leaching tank and transferring means between the at least one secondary tank and the at least one primary tank for transferring resulting solution from the at least one primary tank for addition of alkali; (iii) at least one electrolytic cell for electrolysis of solution from the at least one secondary tank and means for transferring of solu- tion from the at least one secondary tank to the at least one electrolytic cell; (iv) means for removal of deposited metal from the cathode of the at least one electrolytic cell; (v) at least one crystalliser and means for transferring of solution from the at least one electrolytic cell to the at least one crystalliser; (vi) means for transfer of crystals from the at least one crystal- liser for subsequent collection; (vii) means for removal of mother liquor from the at least one crystalliser and recycling the mother liquor back to the at least one primary leaching tank. The inven- tion is particularly suited for the production of metals referred to in qualitative chemical analysis as the tin group which includes mercury, arsenic, antimony and tin.
322933
Dedenus Bernice I.
Dedenus Robert N.
Robic Robic & Associes/associates
Smith David V.
Smith Jennifer M.
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