(1. 中南大學(xué) 化學(xué)化工學(xué)院，長沙 410083；2. 吉首大學(xué) 化學(xué)化工學(xué)院，吉首 416000)
摘 要: 以過硫酸銨為氧化劑，研究低品位氧化銅礦在氨−硫酸銨體系氧化浸出工藝。討論氨/銨離子摩爾比、總氨濃度，氨、硫酸銨和過硫酸銨的濃度，反應(yīng)溫度，液固比，反應(yīng)時間和攪拌速度等操作條件對銅浸出的影響。結(jié)果表明：在92.8%的礦樣粒徑小于0.045 mm，氨、硫酸銨和過硫酸銨濃度分別為2.4、1.8和0.100 mol/L，浸出時間為90 min，溫度為30 ℃，液固比(mL/g)為5:1，攪拌速度為500 r/min時的優(yōu)化條件下，低品位銅礦的銅浸出率達(dá)87.7%。
關(guān)鍵字: 低品位氧化銅礦；氧化浸出；氨−硫酸銨；過硫酸銨
（1. School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
2. College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China）
Abstract:The oxidative leaching of low-grade copper ore was investigated in the ammonia-ammonium sulfate solution with ammonium persulfate. The effects of different parameters on the leaching of copper, including ammonia-to- ammonium ion ratio, total ammonia concentration, concentrations of ammonia, ammonium sulfate and ammonium persulfate, temperature, liquid-to-solid ratio and stirring speed, were investigated. The result shows that the optimal conditions for the leaching of low-grade copper ore with a copper extraction 87.7% are the particle sizes of 92.8% of sample finer than 0.045 mm, the concentrations of ammonia, ammonium sulfate and ammonium persulfate are 2.4, 1.8 and 0.100 mol/L, respectively, leaching time 90 min, temperature 30 ℃, liquid-to-solid ratio (mL/g) 5:1, stirring speed 500 r/min.
Key words: low-grade copper ore; oxidative leaching; ammonia-ammonium sulfate; ammonium persulfate
