摘要
针对硫氰酸盐浸金液金回收效率低且成本高等问题,利用电沉积法从硫氰酸铵浸金液中回收金。采用单因素法研究了阳极材料、阴极材料、极间距、槽电压、溶液pH值和温度对金沉积率的影响,结果表明:以石墨棒作阳极、自制电极作阴极,在极间距为10 mm、槽电压为4 V、溶液pH=12和温度为35℃的条件下,电解2 h,金沉积率达到98.95%。采用响应面法研究了槽电压、溶液pH值与溶液温度之间的交互作用及其对金沉积率的影响,结果表明:各因素对金沉积率的影响程度依次为槽电压>溶液pH值>溶液温度,并建立了电沉积金响应面回归模型。在槽电压为4.10 V、溶液pH=12.40和温度为39.58℃的最佳条件下,模型预测值为99.06%,试验平均值为99.04%,二者结果非常接近,证明该模型能够对金沉积率进行准确的分析预测。本研究进一步完善了硫氰酸盐提金工艺理论体系。
The leaching agent cyanide has been on the verge of elimination due to its great harm to the environment and human health.The non-cyanide agent thiocyanate as an efficient and environmentally friendly gold leaching agent has become the object of research by scholars both domestic and foreign.However,the recovery methods from thiocyanate leachate are less studied,and there are problems with low efficiency and high cost of gold recovery.Therefore,it is urgent to find a highly productive,low-cost,and simple method to recover gold from leaching solution efficiently.On the basis of the above problems,ammonium thiocyanate was used for the leaching test of bio-oxidized slag from a difficult gold concentrate,and recovered gold from the leaching solution by electrodeposition.The single factor method was used to study the influence of various factors on the gold deposition rate.The results show that the self-made electrode with a large surface area,good corrosion resistance,and high metal deposition efficiency is an excellent cathode.The graphite rods with good conductivity,not involved in the reaction process,reused,is a good choice for anode materials.Stainless steel rods are not suitable as electrode materials due to their susceptibility to corrosion.Under the conditions of electrode spacing of 10 mm,cell voltage of 4 V,solution pH value of 12,and solution temperature of 35℃,using a graphite rod as an anode and a self-made electrode as a cathode,the gold deposition rate can reach 98.95%.The interaction between tank voltage,solution pH value,and solution temperature and the effect on gold deposition rate were investigated by response surface methodology,and the electrodeposition gold response surface regression model was established.The P value and mismatch value of the model are within a reasonable range,and the predicted value and actual value of the gold deposition rate basically fell in a straight line,shows that the model fits well and is highly reliable.The correlation between the test factors and the gold deposition rate can be described.The final results show that the degree of each factor on the gold deposition rate is cell voltage>solution pH value>solution temperature,among them,the interaction between cell voltage and solution pH value is the most significant,and the interaction between solution pH value and solution temperature is the least significant.Under the optimal conditions of cell voltage 4.10 volts,solution pH value of 12.40,and solution temperature of 39.58℃,the predicted value of the model is 99.06%,and the experimental average value is 99.04%.The two results are remarkably close,which proves that the model can accurately analyze and predict the gold deposition rate.This study further improves the theoretical system of thiocyanate gold extraction process.
作者
曾超聪
张广盛
吴为荣
黄万抚
李新冬
王泽凯
刘观发
ZENG Chaocong;ZHANG Guangsheng;WU Weirong;HUANG Wanfu;LI Xindong;WANG Zekai;LIU Guanfa(School of Resources and Environmental Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Jiangxi Sanhe Gold Industry Co.,Ltd.,Dexing 334200,Jiangxi,China;Ganzhou Innovation Center for Water Quality Security Technology at Ganjiang River Basin,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China;Ganzhou Key Laboratory of Basin Pollution Simulation and Control,Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)
出处
《黄金科学技术》
CSCD
2023年第2期349-358,共10页
Gold Science and Technology
基金
国家自然科学基金项目“超细粒群在离心流化场内的流膜复合运动规律及松散分选理论研究”(编号:51864017)资助。
关键词
硫氰酸盐浸金液
电沉积法
电极材料
金沉积率
响应曲面法
thiocyanate leaching solution
electrodeposition method
electrode material
gold deposition rate
response surface analysis
