含砷金精矿催化压力氧化—氰化提金试验研究

Experimental research on gold extraction from arsenic gold concentrate by catalytic pressure oxidation-cyanidation process

针对某含砷金精矿,进行了催化压力氧化—氰化提金工艺研究,考察了亚硝酸钠用量、氧化温度、硫酸用量、氧分压等对催化压力氧化效果的影响。结果表明:在亚硝酸钠用量50 kg/t,硫酸用量135 kg/t,氧化温度200℃,氧分压0.6 MPa,氧化时间2.0 h的最佳条件下,金浸出率为97.65%;催化压力氧化过程中金溶解率为24.25%;酸性氧化液采用活性炭吸附,金吸附率达到99.51%。该工艺可有效处理含砷金精矿,指标较好。

In this paper,the research on gold extraction from arsenic gold concentrate by catalytic pressure oxidation-cyanidation process was conducted,and the influence of sodium nitrite dosage,oxidation temperature,sulfuric acid dosage and oxygen partial pressure on catalytic pressure oxidation performance was investigated.The results show that with optimal conditions:sodium nitrite 50 kg/t,sulfuric acid 135 kg/t,oxidation temperature 200℃,oxygen partial pressure 0.6 MPa and oxidation time 2.0 h,the gold leaching rate is 97.65%.However,the dissolution rate of gold in the process of catalytic pressure oxidation is 24.25%.Activated carbon was used to adsorb the acid oxidation solution,and the gold adsorption rate reached 99.51%.This process can effectively treat arsenic gold concentrate,with good indexes.