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Decomposition of Sulfide Minerals.

Patent Number Unknown Chem Abstr 84:138 944B U S Pat Appl 588 547 6/19/75 12 PP :
Chalcopyrite ores or concentrates containing up to 25 pct of related minerals such as bornite or covellite are decomposed by an aqueous solution containing 25 pct hcl, and crcl2, vcl2, or ticl3. These can be added to the solution in the reduced state, or in the more common higher valence state and reduced with a metal such as al, zn, fe, etc., before reacting with the chalcopyrite. The result of the reaction is solution of practically all of the fe as fecl2, evolution of most of the s as h2s, and the cu largely remaining as cu2s in the solid residue. The lower-valence chlorides of cr, V, or ti are oxidized to higher valence in the reduction of fe and s. If these reactions are combined with reduction by metallic agents such as zn, al, or fe, or with electrolytic reduction of cu in a divided cell, cu2s can be changed to h2s and metal powder in the residue, and the powder can be leached out with an ammoniacal solution for recovery of a cu complex without fe.
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Patent Number Unknown; Chem. Abstr. 84:138,944B; U.S. Pat. Appl. 588,547; 6/19/75; 12 PP.