锌粉置换硫代硫酸盐浸金液中金试验研究  

Experimental Study on Recovering Gold from Thiosulfate Leaching Liquid with Zinc Powder

作　　者：王杰[1,2,3] 张覃[1,2,3] 李先海[1,2,3] 沈智慧[1,2,3] 叶军建[1,2,3] 

机构地区：[1]贵州大学矿业学院,贵州贵阳550025 [2]贵州省非金属矿产资源综合利用重点实验室,贵州贵阳550025 [3]贵州省优势矿产资源高效利用工程实验室,贵州贵阳550025

出　　处：《矿冶工程》2016年第3期91-93,101,共4页Mining and Metallurgical Engineering

基　　金：国家"十二五"科技支撑计划课题(2012BAB08B06);贵州大学矿业学院创新基金(院研2015003)

摘　　要：以10μg/L金标准液与硫代硫酸钠、氨水合成浸金液,采用锌粉置换法回收所合成浸金液中的金。结果表明:锌粉用量增加,金置换率提高;选取锌粉用量为0.4 g/L,随反应时间增加,金置换率下降;浸金液中铜离子和单质S、SO_4^(2-)、SO_3^(2-)等多硫化物对置换反应不利;游离硫代硫酸盐对置换影响较小;添加铅盐对置换反应有利。SEM-EDS分析表明,经5%乙酸铅溶液浸泡后的锌粉表面有铅生成,生成的铅与锌形成电偶加速置换反应,同时,锌粉表面变蓬松,增大了锌粉与Au(S_2O_3)_2^(3-)的接触面积,有利于置换反应的进行。Test was conducted on recovering gold by zinc powder replacement from a simulated thiosulfate leaching liquid that was prepared with 10 μg/L of gold standard solution, Na2S2O3 5H2O and NH3 H2O. Results showed that an increment of zinc powder dosage could increase the gold replacement rate. With the dosage of zinc powder at 0.4 g/L, the gold replacement rate was decreased with the reaction time prolonged. It is found that CuE＋, S, SO42- and SO32- in the gold-leaching liquid are unfavorable for replacement process, and the free thiosulfate has little influence on the replacement. However, the addition of lead salts is favorable for the replacement. The following SEM-EDS analysis showed that lead was generated on the surface of zinc powder after being soaked in the 5% lead acetate solution. Those generated lead reacted with zinc to form galvanic couple, which accelerated the replacement process. Meanwhile, the fluffy zinc powder enlarged the contact surface between zinc and AuAu（ S2O3 ）23-, that was beneficial to the replacement too.

关 键 词：金 浸金液 硫代硫酸盐 锌粉 置换 铅盐 电偶 

分 类 号：TF111[冶金工程—冶金物理化学]