乳状液膜提取废汞触媒浸出液中的汞及乳状液破乳

采用乳状液膜法分离提取废汞触媒浸出液中的Hg^2+。考察了影响乳状液膜体系分离富集汞的主要因素,并对分离提取后的乳液相进行了破乳研究。分离提取实验结果表明:乳状液膜体系的最佳配方为流动载体磷酸三丁酯体积分数10%、表面活性剂失水山梨糖醇脂肪酸酯体积分数4%、膜溶剂磺化煤油体积分数86%、内水相HCl溶液浓度0.10 mol/L、油相与内水相的体积比1∶1;在乳状液与外水相的体积比为1∶10的条件下Hg^2+提取率达78.50%。破乳实验结果表明:加热破乳、离心破乳、加热离心联合破乳3种方法的破乳率分别为29.0%,54.0%,85.7%;采用加热离心联合法破乳后,Hg^2+富集倍数达8.5。

Extraction of mercury from leaching solution of waste mercury catalyst by emulsion liquid membrane and demulsification of emulsion

Hg²⁺ in leaching solution of waste mercury catalyst was separated by extraction with emulsion liquid membrane. The main factors affecting the separation and enrichment of mercury in the emulsion membrane system were investigated,and demulsification experiments of the emulsion phase were carried out. Based on the extraction experimental results,the optimal formulation of the emulsion liquid membrane system was as follows：10% （φ） tributyl phosphate as flow carrier,4% （φ） sorbitol fatty acid ester as surfactant,86% （φ） sulfonated kerosene as membrane solvent,0.10 mol/L HCl solution as internal aqueous phase and the volume ratio of oil phase to internal aqueous phase 1∶1. The extraction rate of Hg²⁺ reached 78.50% under the condition of volume ratio of emulsion to external aqueous phase 1∶10. The experimental results of demulsification showed that：The demulsification rate by heating,centrifugation and heating-centrifugation were 29.0%,54.0% and 85.7%,respectively;The enrichment factor for Hg²⁺ reached 8.5 by heating-centrifugation combined demulsification.