论文部分内容阅读
研究铜渣浮选尾砂中铜在NH_3·H_2O-NH_4Cl体系中的浸出行为。结果表明,铜的最佳浸出条件为:炉渣粒度为-0.045mm,浸出温度60℃,氨水浓度3.0mol/L,氯化铵浓度2.5mol/L,双氧水添加量0.2mL/g,液固比6∶1,搅拌速度500r/min,浸出时间120min,铜的浸出率为62.22%;浸出过程受内扩散控制,浸出反应的表观活化能Ea=11.56kJ/mol,反应表观级数为0.938 83,温度条件下铜浸出反应动力学方程为lnk=-1.390 42×103/T-2.108 67,氨水浓度条件下铜浸出反应动力学方程为lnk=0.938 83lnc-9.292 29。
The leaching behavior of copper in the NH_3 · H_2O-NH_4Cl system was studied. The results showed that the optimum leaching conditions of copper were: slag size of -0.045mm, leaching temperature of 60 ℃, ammonia concentration of 3.0mol / L, ammonium chloride concentration of 2.5mol / L, hydrogen peroxide dosage of 0.2mL / g, liquid to solid ratio 6: 1, stirring speed 500r / min, leaching time 120min, the leaching rate of copper was 62.22%. The leaching process was controlled by internal diffusion. The apparent activation energy of leaching reaction was Ea = 11.56kJ / mol and the apparent reaction order was 0.938 83, the kinetic equation of copper leaching reaction under temperature is lnk = -1.390 42 × 103 / T-2.108 67, the kinetic equation of copper leaching reaction under the condition of ammonia concentration is lnk = 0.938 83lnc-9.292 29.