含砷硫金精矿二段焙砂中杂质金属去除研究

Impurity Metals Removal from Two-Stage Calcine of Gold Concentrate Bearing Arsenic and Sulfur

基于赤铁矿在稀硫酸中较难溶解的特性,研究了两段金焙砂中其它元素在稀硫酸中的溶解情况,以期减轻后续焙砂酸解液制备铁化工产品过程的除杂负担。结果表明,两段金焙砂在稀硫酸浓度为12%、浸出温度90℃、浸出时间120min、液固比4/1的条件下,锌可以被完全脱除,砷和镁的脱除率分别达到91.06%、96.09%以上,但铝、铜、镍的浸出率较差,分别为45.59%、48.11%、18.11%,同时铁的溶解率也达到14.38%。硫酸浓度对杂质金属浸出率影响较大,硫酸浓度越高,杂质金属进入浸出液量越多。

Based on features that hematite can not dilute into sulfuric acid, dissolution in other elements of two-stage calcine was studied in dilute sulfuric acid to reduce purification burden of process iron chemical products prepared using acid solution. The results show that zinc can be completely removed, removal rate of As and Mg is 91.06% and 96.09% above respectively, and the leaching rate of Al, Cu and Ni is 45.59 %, 48.11% and 18.11% respectively in two-stage calcine under the conditions including sulfuric acid concentration of 12M, leaching temperature of 90 ℃, leaching time of 120 min, and L/S=4/1. Sulfuric acid concentration has a big influence on the leaching rate of impurities, at the same time, iron dissolution rate is 14.38%. The higher the sulfuric acid concentration is, the higher the leaching rate of impurity metals is.