<報文>硫化亜鉛精鉱の元素状硫黄生成型浸出反応に及ぼすNa-lignosulphonate添加の効果

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Effect of the presence of sodium lignosulphonate in direct pressure leaching of zinc sulphide concentrate in dilute H_2SO_4 solution according to the reaction, ZnS+H_2SO_4+1/2O_2=ZnSO_4+H_2SO_4+S at temperatures above the melting point of sulphur was examined. Sodium lignosulphonate was effective not only in raising the initial rate of leaching but also in keeping the rate up to 80% zinc extraction, while in the absence of sodium lignosulphonate the leaching was suppressed at about 50% extraction. However, even when sodium lignosulphonate was added, an extremely oxidizing condition, for instance, oxygen overpressure of 5kg/cm^2 at 150℃, again resulted in suppressed extraction of zinc. It was also noticed that the addition of sodium lignosulphonate slightly retarded the leaching reaction at 110℃, where the produced sulphur was in a solid state.
1981-03-25