(中南大學(xué)冶金與環(huán)境學(xué)院，長(zhǎng)沙 410083)
摘 要: 以難冶金精礦煙塵為原料，研究了氫氧化鈉浸出、硫酸浸出以及硫酸與氫氧化鈉聯(lián)合浸出對(duì)煙塵中砷、鐵和碳脫除及氰化浸金的影響。結(jié)果表明：在氫氧化鈉濃度為6mol/L時(shí)，砷、碳脫除率分別為99.66%和60.63%，金浸出率為58.90%，較直接氰化浸出僅提高4.60%，砷的有效去除不能有效提高金的浸出率。在硫酸質(zhì)量分?jǐn)?shù)為15%時(shí)，鐵、砷和碳脫除率分別為33.65%、80.38%和12.59%，金的浸出率為80.40%，與氫氧化鈉浸出相比，硫酸浸出解離鐵能有效提高金的浸出率。煙塵分別經(jīng)過質(zhì)量分?jǐn)?shù)為15%硫酸浸出后氰化浸金，兩次2 mol/L氫氧化鈉浸出和氰化浸金后，煙塵中鐵、砷和碳的總脫除率分別為33.65%、 95.63%和79.60%，渣率為80.33%。此時(shí)，金的總浸出率為91.90%，氰化渣中金的含量為3.31g/t。與煙塵直接氰化浸出相比金的浸出率提高37.60%。
關(guān)鍵字: 金精礦；焙燒；煙塵；浸出除雜；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
