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针对太平洋中部深海粘土HCl浸出液酸度高、成分复杂等特点,克服现有萃取剂不足,采用新型萃取剂P535从高浓度HCl浸出液中直接萃取回收Y~(3+),考察料液酸度、萃取剂浓度、萃取时间和相比对萃取的影响以及HCl,H2SO4反萃剂对反萃的影响,分别绘制萃取平衡等温线和反萃平衡等温线,确定反萃方案并完成转型。结果表明:以有机相组成为10%P535(质量分数)+磺化煤油作为萃取剂,料液酸度为1.12 mol·L-1HCl,其最佳萃取条件为:萃取时间5 min,相比O/A=1∶2。经过3级逆流萃取,Y~(3+)萃取率达到98%,Fe~(3+)共萃进入有机相,其他金属基本不萃取。负载有机相用2 mol·L-1的H2SO4溶液可选择性反萃Y~(3+),得到Y_2(SO_4)_3溶液,反萃Y~(3+)的有机相再用8 mol·L-1HCl溶液反萃共萃的Fe~(3+),完成转型。
In view of the high acidity and complicated composition of HCl leachate from deep-sea clay in the central Pacific Ocean, the present invention overcomes the deficiencies of the existing extractants by directly extracting and recovering Y 3+ from the high-concentration HCl leachate using a novel extractant P535, Concentration, extraction time and the impact on extraction as well as the influence of HCl, H2SO4 stripping agent on stripping, draw the equilibrium equilibrium isotherm and stripping equilibrium isotherm, respectively, to determine the stripping solution and complete the transformation. The results showed that the optimal extraction conditions were as follows: the extraction time was 5 min and the acidity was 1.12 mol·L-1 HCl with the organic phase of 10% P535 (mass fraction) + sulfonated kerosene as the extractant. Compared with O / A = 1: 2. After three-stage countercurrent extraction, the extraction rate of Y ~ (3+) reached 98%, Fe ~ (3+) was co-extracted into the organic phase, and the other metals were not extracted. Y 2 (SO 4) 3 solution was selectively stripped with 2 mol·L -1 H 2 SO 4 solution and the organic phase of stripping Y 3+ was loaded with 8 mol·L -1HCl solution stripping coexisted Fe ~ (3 +), to complete the transformation.