(中南大學(xué) 資源加工與生物工程學(xué)院，長沙 410083)
摘 要: 結(jié)合化學(xué)成分、物相分析和氰化浸金實(shí)驗(yàn)，研究酸性浸銻渣的浸金特性以及氧化焙燒預(yù)處理對浸金的影響機(jī)理，并考察酸法浸銻-氧化焙燒脫硫-氰化浸金的工藝流程。結(jié)果表明：黃鐵礦包裹金是造成酸性浸銻渣中金難浸的主要原因，經(jīng)氧化焙燒后，焙砂中單質(zhì)硫和硫化物的含量顯著降低，總硫含量降至0.15%(質(zhì)量分?jǐn)?shù))，硫化物轉(zhuǎn)變?yōu)槌噼F礦，焙砂的氰化浸金率達(dá)95.92%，比酸性浸銻渣直接浸金提高了24%。
關(guān)鍵字: 浸銻渣；氧化焙燒；脫硫；氰化浸金
（School of Mineral Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:Combined with chemical composition, physical phase analysis and gold cyanidation experiment, the characteristics of gold leaching and the affecting mechanism of oxidizing roasting pretreatment were studied on an acidic antimony leaching residue. The process of acid antimony leaching-oxidizing roasting desulfurization-gold cyanidation was also investigated. The results show that being wrapped in pyrite is the primary cause for low leaching rate of gold in the acidic antimony leaching residue. Pretreated by oxidizing roasting, the contents of elemental sulfur and sulfide decrease sharply. As a result, the total sulfur content in the calcine diminishes to only 0.15% (mass fraction) and the ferrous sulfide converts into hematite. The leaching rate of gold cyanidation from the calcine increases up to 95.92%, showing a favorable increment of 24% compared with that of direct leaching from the acidic antimony leaching residue.
Key words: antimony leaching residue; oxidizing roasting; desulfurization; gold cyanidation
