D311树脂对氰化提金尾液中铜氰络合离子的吸附行为  

Adsorption of D311 Resin on Copper Cyanide Complex Ions in Gold Cyaniding Tail Solution

作　　者：周军[1,2,3] 张华[1] 王丽君[1] 宋永辉[1,2,3] 党晓娥[1,2] 张秋利[1,2,3] 

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055 [2]陕西省黄金与资源重点实验室,陕西西安710055 [3]陕西省冶金工程技术研究中心,陕西西安710055

出　　处：《稀有金属》2016年第4期363-369,共7页Chinese Journal of Rare Metals

基　　金：国家自然科学基金青年科学基金项目(51204130);陕西省自然科学基础研究计划项目(2012JM7013);西安建筑科技大学基础研究基金项目(JC1212)资助

摘　　要：采用D311树脂吸附处理含高铜氰化提金尾液,分别考察了树脂添加量、吸附反应时间、反应温度、溶液p H等对铜氰络合离子吸附率的影响,获得了静态吸附最优工艺条件,并从热力学及动力学角度研究了D311树脂对铜氰络合离子的吸附特征。结果表明:当D311树脂吸附经硫酸铜沉淀预处理后的提金尾液时,在液固比(滤液与树脂体积比)为5∶1、溶液p H<9、室温、吸附反应时间135 min的优化工艺条件下,其对铜氰络合离子的吸附率可达98%以上。该吸附过程符合Freundlich吸附模型,为优惠吸附;吸附过程的速度控制步骤为颗粒扩散和化学反应共同控制。采用准一阶动力学模型和准二阶动力学模型分别对吸附动力学数据进行模拟,发现D311树脂对含高铜氰化提金尾液中铜氰络合离子的吸附符合准二阶动力模型,其理论吸附量为12.6023 mg·ml-1,与实验所测的平衡吸附量吻合,吸附速率常数k=1.236×10-2min-1。High copper bearing gold cyaniding tail solution was absorbed by D311 resin. The effect of adding amount of resin,adsorption time,temperature,and p H on the adsorption rate of the copper cyanide complex ions were investigated,as well as the adsorption characteristics from both thermodynamics and kinetics. The optimal condition of static adsorption was obtained. The results showed that the adsorption rate of copper cyanide complex ions was more than 98% by D311 resin adsorbing the leaching gold tail solution which was pretreated by copper sulfate under the following conditions： liquid-solid ratio（ volume ratio of filtrate to resin） of 5∶ 1,p H 9,room temperature and adsorption reaction time of 135 min. The adsorption process was in accord with Freundlich models and was a favorable adsorption. The controlling step of this adsorption speed was interacted by particle diffusion and chemical reaction. Adopting the pseudo-first-order kinetics model and the pseudo-second-order kinetics model to simulate the experimental data of adsorption kinetics,the results suggested that this process conformed to the pseudo-second-order kinetics model. The theoretical adsorption capacity was 12. 6023 mg·ml^- 1,which was consistent with the equilibrium adsorption capacity measured. The adsorption rate constant was k =1. 236 × 10^- 2min^- 1.

关 键 词：D311树脂 铜氰络合离子 静态吸附 热力学 动力学 

分 类 号：X758[环境科学与工程—环境工程]