文献类型：期刊文献

中文题名：硫脲反萃取季铵盐负载有机相中金、银、铜

英文题名：Stripping of Gold, Silver and Copper from Loaded Quaternary Ammonium Salt by Acidified Thiourea Solution

作者：周展云[1];傅建顺[1];吴志泉[1];杨惠明[1];黄顺德[1]

机构：[1]华东化工学院化学工程研究所

年份：1990

卷号：16

期号：5

起止页码：515

中文期刊名：华东化工学院学报

收录：国家哲学社会科学学术期刊数据库;Scopus;CSCD:【CSCD2011_2012】；

语种：中文

中文关键词：硫脲;反萃取;季铵盐;萃取剂

外文关键词：extraction;thioureas;extractive agent;gold;silver;copper;quaternary ammonium compounds;stripping

摘要：硫脲对金、银、铜的反萃取能力和体系的酸度有关。利用此特点,通过调节体系酸度并采用分段反萃取可达到金与银、铜的基本分离。反萃取过程的适宜工艺条件为:温度60℃;反应时间大于5min;流比1/3;硫脲浓度1.2mol/L;酸度0.5mol/L HCl(反萃液Ⅰ)和1.5mol/L HCl和(反萃液Ⅱ)。负载有机相经两段共五级逆流反萃取后,金、银、铜的反萃率均达99.8%以上。将反萃体系在高流比混合澄清器中进行小规模生产性试验,结果与模拟平衡值相近,级效率达95%。用电沉积法将硫脲液中金和银、铜按不同的槽电压进行分离,所得硫脲贫液经调整后可返回反萃体系,反萃能力不受影响。
Both theoretical analyses and experimental results showed that SC(NH_2)_2 can replace CN- in R_3CH_3NM(CN)_2 forming R_3CH_3N^+ and M(SC(NH_2)_2)_2^+ under acidic condition. The stripping ability of thiourea is related to acidity and Au can be separated from Ag, Cu by controlling acidity and adopting two-step successive stripping. It was found that when the concentration of SC(NH_2)_2 was 1.2 mol/L; that of HCl was 0.5 mol/L(stripping solution Ⅰ) and 1.5 mol/L(stripping solution Ⅱ); t>5 min and flow ratio of V_A/V_O = 1/3, at a temperature of 60 ℃ under moderate agitation, the stripping effeciencies of Au, Ag, Cu were all over 99.8% with five-stage countercurrent stripping. The small-scale test of stripping in a high flow ratio vertical mixer-settler was carried out and it is concluded that the experimental results agree with the simulated equilibrium data, the stage effeciecy would reach 95%. Au, Ag and Cu were finally recovered and completely separated from each other by electrowinning using different bath voltages and the acidified thiourea solution can be used again for recycling.