高碱度脉石低品位氧化铜矿氧化氨浸动力学  

Kinetics of Oxidative Ammonia Leaching of High Alkali Gangue and Low Grade Copper Oxidized Ore

作　　者：赵洪冬[1] 顾帼华[2] 褚亦功 刘新刚 朱仁峰 

机构地区：[1]湖南有色金属研究院,湖南长沙410100 [2]中南大学资源加工与生物工程学院,湖南长沙410083 [3]拜城县滴水铜矿开发有限责任公司,新疆阿可苏地区842306

出　　处：《湿法冶金》2014年第6期416-423,共8页Hydrometallurgy of China

摘　　要：研究了高钙镁碱性脉石的低品位氧化铜矿在氨-硫酸铵溶液中的氧化氨浸过程,考察了搅拌速度、温度、液固体积质量比、矿石粒度和氨、硫酸铵、过硫酸铵浓度等因素对浸出的影响,分析了氧化浸出过程动力学。结果表明:该矿石氨浸过程符合界面传质和固体残留膜层(或产物层)扩散的混合控制模型,其表观活化能为12.32kJ/mol,半经验动力学方程为1/3ln(1-x)+(1-x)-1/3-1=1.89×10-2·c0.25(氨水)·r0.355·c0.175(过硫酸铵)·c0.258(硫酸铵)·d0-0.154·e(-1 506.78/T)t;提高浸出剂浓度和温度,可加速铜的浸出速度,提高浸出率。Process of oxidative leaching of high alkali gangue and low grade copper oxidized ore in the＆amp;nbsp;system of ammonia‐ammonium sulfate was reseached .The effects of stirring speed ,leaching temperature ,liquid‐solid ratio ,particle size and concentrations of ammonia ,ammonium sulfate and ammonium persulfate on the leaching behavior of copper were examined .The kinetics of the oxidative leaching process was analyzed .The results show that the leaching process conforms to the model which the reaction is controlled by both interface mass transfer and diffusion of solid residual film （or product layer） .The reaction apparent activation energy（Ea） is 12 .32 kJ/mol ,and the semi‐empirical kineticsequationofoxidativeleachingis 1/3ln（1-x）＋ （1-x）- 1/3 -1=1.89×10^-2·c0.25（NH3·H2O）· r^0 .355 · c^0 .175 （（NH4 ）2S2O8 ） · c^0 .258 （（NH4）2SO4 ） · d^0 -0 .154 e^（-1506 .78/T） · t .T he leaching rate and recovery can be improved by increasing the leaching agent concentration and temperature .

关 键 词：高碱度 低品位 氧化铜矿石 氨水 氧化浸出 动力学 铜 

分 类 号：TF803.21[冶金工程—有色金属冶金] TF811