摘要
采用常压浸出与加压浸出相结合的方法,研究硫化锌精矿在富氧硫酸体系中的常压直接浸出动力学。结果表明:锌浸出受界面化学反应控制,浸出反应表观活化能为(44.28±4.28)kJ/mol。浸出槽底部锌的浸出速率远高于浸出槽上部锌的浸出速率,且随槽底矿浆压力的增大,锌的浸出速率明显提高。进一步基于收缩核模型,通过二次回归方法,建立浸出槽底部锌的浸出动力学方程。在硫化锌精矿常压富氧直接浸出中,对于位于浸出槽底部的锌浸出,温度的影响明显大于矿浆压力的影响。
The atmospheric direct leaching（ADL） kinetics of zinc sulfide concentrate in oxygen-rich sulfuric acid system was studied by the integration of atmospheric leaching and pressure leaching. The results show that the extraction of zinc is controlled by interface chemical reaction and the apparent activation energy of leaching reaction is calculated as（44.28±4.28） kJ/mol. The leaching rate of zinc at the bottom of ADL tank is much higher than that at the top of ADL tank and it is improved greatly with the increase of the slurry pressure at the bottom of ADL tank. The kinetic equation for zinc leaching at the bottom of ADL tank was further established by quadratic regression on the basis of shrinking core model. The influence of temperature on the extraction of zinc at the bottom of ADL tank is greater than that of slurry pressure.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2013年第12期3440-3447,共8页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(50964004)
江西省第四批青年科学家培养对象资助项目(赣科发计字[2010]209号文)
关键词
硫化锌精矿
硫酸
常压直接浸出
富氧
动力学
zinc sulfide concentrate
sulfuric acid
atmospheric direct leaching
oxygen-rich
kinetics
