NH_4Cl-NH_3-H_2O体系浸出黄铁矿烧渣中铜的动力学  

Kinetics of Copper Leaching From Pyrite Slag in NH_4Cl-NH_3-H_2O System

作　　者：唐朝波[1] 晋帅勇[1] 唐谟堂[1] 卢阶主[1] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083

出　　处：《湿法冶金》2010年第4期245-249,共5页Hydrometallurgy of China

基　　金：国家自然科学基金项目(No.50774099)

摘　　要：采用NH4Cl-NH3-H2O体系研究了从黄铁矿烧渣中回收有价金属,并研究了铜的浸出动力学。在液固体积质量比20mL∶1g、添加10%次氯酸钙作为氧化剂条件下,考察了搅拌速度、氨浓度、黄铁矿烧渣粒度及反应温度对烧渣中铜浸出速率的影响。理论分析结果表明:黄铁矿烧渣中铜的浸出过程符合块矿浸出的反应区域模型,其宏观动力学方程为1-2/3α-(1-α)2/3=4.34×10-5c0.39d0-2exp(-14300/RT),反应的表观活化能为14.3kJ/mol,反应受灰分层内扩散控制。In order to recover valuable metals in pyrite slag,the leaching kinetics of copper in NH4Cl-NH3-H2O system is studied.The effects of stirring speed,ammonium concentration,pyrite slag particle size and reaction temperature on leaching rate of copper were investigated under leaching conditions of liquid to solid ratio of 20 mL∶1 g and calcium hypochlorite concentration of 10%.The results of kinetic analysis for various experimental conditions indicate that leaching process of copper in pyrite slag follows the reaction zone model of lump ore,and the macrokinetics equation is of 1-2/3α-（1-α）2/3=4.34×10-5c0.39d-20exp（-14 300/RT）.The apparent activation energy of reaction is about 14.3 kJ/mol.The reaction is controlled by internal diffusion through the ash layer.

关 键 词：黄铁矿烧渣 NH4Cl-NH3-H2O体系 铜 浸出 动力学 

分 类 号：X753[环境科学与工程—环境工程]