Abstract
Cobalt crusts were leached in an ammoniacal solution using sulfur dioxide gas as a reductant, and the effects of leaching time, leaching temperature and concentration of ammonium carbonate on the leaching of nickel, cobalt, copper, iron and manganese were investigated. The selective leaching of nickel, cobalt and copper from cobalt crusts was attained by using ammonium carbonate solution and sulfur dioxide gas as a reductant. The leaching percentages of metallic elements under the suitable leaching conditions were 90 % for nickel, 97 % for cobalt, 93 % for copper, 1.8 % for iron and 6.0 % for manganese. The separation of nickel, cobalt, copper from ammonium carbonate solution was carried out by solvent extraction. Extraction experiment was done by using LIX84-I as extractant. The extraction percentages of copper and nickel were more than 99 %, while that of cobalt was less than 1.0 %. Extraction of cobalt was masked by sulfite ion. From the organic phase containing nickel and copper, nickel was selectively stripped by dilute sulfuric acid or hydrochloric acid solution at the pH of 1.5. Copper was stripped at the pH of zero.
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