(中南大学冶金与环境学院，长沙 410083)
摘 要: 以难冶金精矿烟尘为原料，研究了氢氧化钠浸出、硫酸浸出以及硫酸与氢氧化钠联合浸出对烟尘中砷、铁和碳脱除及氰化浸金的影响。结果表明：在氢氧化钠浓度为6mol/L时，砷、碳脱除率分别为99.66%和60.63%，金浸出率为58.90%，较直接氰化浸出仅提高4.60%，砷的有效去除不能有效提高金的浸出率。在硫酸质量分数为15%时，铁、砷和碳脱除率分别为33.65%、80.38%和12.59%，金的浸出率为80.40%，与氢氧化钠浸出相比，硫酸浸出解离铁能有效提高金的浸出率。烟尘分别经过质量分数为15%硫酸浸出后氰化浸金，两次2 mol/L氢氧化钠浸出和氰化浸金后，烟尘中铁、砷和碳的总脱除率分别为33.65%、 95.63%和79.60%，渣率为80.33%。此时，金的总浸出率为91.90%，氰化渣中金的含量为3.31g/t。与烟尘直接氰化浸出相比金的浸出率提高37.60%。
关键字: 金精矿；焙烧；烟尘；浸出除杂；氰化
（School of Metallurgy and Environment, Central South University, Changsha 410083, China）
Abstract:A dust of refractory Au concentrates was used as raw material. The effects of sodium hydroxide leaching, sulfuric acid leaching and sulfuric acid-sodium hydroxide combined leaching on the As, Fe, and C removal and cyanide leaching were studied.The results show that As and C removal rate, at 6 mol/L NaOH concentration, are 99.66% and 60.63%, respectively. And Au leaching is 58.90% and increases by 4.60% compared to direct cyanide of the dust. The effective removal of arsenic can not effectively improve the gold leaching efficiency. Fe, As and C removal rate, at 15% sulfuric acid concentration, increases from 0 to 33.65%, 80.38% and 12.59%, respectively. And Au leaching effieciency increases to 80.40%. Compared with sodium hydroxide aching, Fe removal with sulfuric acid leaching can effectively improve the gold leaching efficiency. Through once cyanide leaching after 15% sulfuric acid leaching and twice 2 mol/L NaOH and cyanide leaching, the total removal rates of iron, arsenic and carbon in the dust are up to 33.65%, 95.63% and 79.60%, respectively, the total leaching efficiency of gold is 91.90%, and the content of gold in cyanide residue is 3.31 g/t with residue rate of 80.33%. Compared with the direct cyanide leaching, the gold leaching efficiency increases by 37.60%.
Key words: gold concentrates; roasting; dust; impurity removal by leaching; cyanidation
