浮选金精矿和难浸含铜金矿的碘化浸金  

Gold extraction from gold concentrate and copper-bearing refractory gold ore by iodine-iodide solution

作　　者：袁喜振 李绍英[1] 孙春宝[1] 王海霞 赵留成[1] 李根壮[1] 郭林中 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [2]山西中条山工程设计有限公司,运城043700 [3]河南省地矿局第三地质矿产调查院,信阳464000

出　　处：《中国有色金属学报》2014年第12期3123-3128,共6页The Chinese Journal of Nonferrous Metals

基　　金：高等学校博士学科点专项科研基金资助项目(20100006110003)

摘　　要：采用碘化浸出工艺在室温条件下对浮选金精矿和某难浸含铜氧化金矿分别进行浸出实验,考察磨矿细度、碘初始浓度、碘与碘离子质量比(m(I2):m(I-))、浸出液p H值和液固比5种因素对两种矿样浸出效果的影响,并结合碘化浸出机理对实验结果进行分析。结果表明:当搅拌速度为400 r/min、温度为25℃、单质碘初始浓度为8 g/L、碘单质与碘离子质量比为1:6、浸出液p H为7.5和液固比为4:1(mL/g)时,金精矿中粒径小于74μm的含量占99.2%,浸出4 h时,金的浸出率达到88.1%;含铜氧化金矿中其粒径小于74μm的含量占91.6%,浸出2 h时,金的浸出率达到88.2%。The gold concentrate and copper-bearing refractory oxidized gold were subjected to iodide/iodine leaching process, respectively, at room temperature. The influences of five factors on the leaching results of the two ore samples were investigated, which include the grinding fineness, I 2 initial concentration, I 2-I^-mass ratio （m（I 2 ）：m（I^-））, pH value and the liquid-to-solid ratio. And the experimental results were discussed combined with the iodization mechanism analysis. The results indicate that the gold leaching rates of the gold concentrate reaches 88.1%under the conditions of the gold concentrate ground product with size of less than 74 μm accounting for 99.2% and the leaching time of 4 h;whereas the gold leaching rate of the refractory gold ore under conditions of the refractory gold ore with size of less than 74 μm accounting for 91.6% and leaching time of 2 h, reaches 88.2%. Moreover, both of them were tested under the conditions as follows：stirring speed 400 r/min, room temperature 25℃, I 2 initial concentration 8 g/L, I 2-I^-mass ratio 1：6, pH value 7.5, liquid-to-solid ratio 4：1 （mL/g）.

关 键 词：碘化浸金 金精矿 难浸含铜氧化金矿 碘 碘化物 浸出率 

分 类 号：TF111[冶金工程—冶金物理化学]