A solid sulfur is more useful to recover and store than a sulfuric acid as a by-product in the zinc hydrometallurgy. In this experiment a zinc concentrate (sphalerite) was leached with fete sulfate at about 373 K for 3 to 6 hours. Zinc was leached more than 95 percent. After a solid-liquid separation, the leached residue contained solid sulfur was obtained. The particles in the residue were dispersed by lignin and the solid sulfur of approximately 85 percent was recovered as float product by a flotation with frother in the pH 4. The dried float product was heated at 413K for 2 hours. The pure solid sulfur was recovered. On the other hand in the leached liquid a zinc oxide was added and ferrous iron was oxidized to fete iron by blowing oxygen. This fete iron was returned to the zinc leached process after solid-liquid separation.
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