摘要
硫代硫酸盐提金是一种绿色环保的非氰提金方法,但高效回收金浸出液中的金尚待进一步研究。以甲基三辛基氯化铵(TOMAC)为萃取剂,考察了萃取条件(萃取剂浓度、相比、萃取时间)及金浸出液性质(pH、硫代硫酸盐浓度、初始Au(Ⅰ)浓度)对TOMAC萃取Au(Ⅰ)性能的影响。结果表明:室温条件下,TOMAC为萃取剂能从硫代硫酸盐金浸出液中高效萃取Au(Ⅰ)。当A O=1、pH=9、硫代硫酸盐浓度0.1 mol L、TOMAC浓度1.8 g L时,对低浓度金(0~25 mg L)几乎能完全萃取;采用1 mol L NaCl能有效反萃出TOMAC有机相中的Au(Ⅰ)。TOMAC萃取Au(Ⅰ)的机制为:TOMAC通过其表面的Cl-与溶液中的Au(Ⅰ)发生离子交换,形成[C_(25)H_(54)N]_(3)[Au(S_(2)O_(3))_(2)]络合物。TOMAC对Au(S_(2)O_(3))_(2)^(3-)具有良好的萃取性能,可实现硫代硫酸盐金浸出液中Au(Ⅰ)的高效回收,具有对硫代硫酸提金技术的潜在应用价值。
Thiosulfate gold extraction is a green and environmentally friendly non-cyanide gold extraction method,but the efficient recovery of gold in gold leaching solution needs further research.Using methyl trioctylammonium chloride(TOMAC)as extractant,the effects of extraction conditions(extractant concentration,phase ratio,extraction time)and the properties of gold leaching solution(pH value,thiosulfate concentration,initial Au(Ⅰ)concentration)on the extraction performance of Au(Ⅰ)by TOMAC were investigated.The results show that at room temperature,TOMAC as extractor can efficiently extract Au(Ⅰ)from gold thiosulfate leaching solution.When A O=1,pH=9,thiosulfate concentration is 0.1 mol L,TOMAC concentration is 1.8 g L,the low concentration of gold(0-25 mg L)can be extracted almost completely.Au(Ⅰ)in TOMAC organic phase can be effectively stripped by 1 mol L NaCl.The extraction mechanism of Au(Ⅰ)by TOMAC is as follow:TOMAC forms[C_(25)H_(54)N]_(3)[Au(S_(2)O_(3))_(2)]complex through ion exchange of Cl-on its surface with Au(Ⅰ)in solution.TOMAC has good extraction performance for Au(S_(2)O_(3))_(2)^(3-),and can realize efficient recovery of Au(Ⅰ)in thiosulfate gold leaching solution,which has potential application value for thiosulfate gold leaching technology.
作者
吴汉娇
王海文
陈云龙
胡显智
字富庭
WU Hanjiao;WANG Haiwen;CHEN Yunlong;HU Xianzhi;ZI Futing(Faculty of Science,Kunming University of Science and Technology,Kunming 610093,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2024年第5期76-82,共7页
Nonferrous Metals（Extractive Metallurgy)
基金
国家自然科学基金资助项目(52264031)。
关键词
硫代硫酸盐
甲基三辛基氯化铵
离子液体
萃取
金
thiosulfate
methyl trioctyl ammonium chloride
ionic liquid
extraction
gold
