摘要
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。
Basing on the deficiency of existing extraction agent and the characteristics of hydrochloric acid leachingsolution of pelagic clay from central pacific,such as high acidity and complicated composition,a new extractant P535 was used to extract Y^3＋ from high hydrochloric acid leaching solution. The effects of feed acidity,extractant concentration,extraction time,extraction phase ration and the effects of H2SO4 and HCl stripping agent on the stripping were investigated. The isotherms of the extraction and stripping were plotted,and the stripping solution was determined and transformation was completed. The results showed that with 10% P535（ mass fraction） in sulphonated kerosene as extractant,the extraction rate of Y^3＋ from the solution with 1. 12 mol·L^-1 HCl reached 97. 62% in three-stage counter current extraction with O / A ratio of 1∶ 2 for 5 min,and Fe was coextracted while other metals are not extracted totally. The Y^3＋ in loaded organic could be selectively stripped using 2 mol·L^-1 H2SO4 solution and obtain yttrium sulphate solution. After Y^3＋ stripping,the Fe^3＋ in loaded organic could be stripped using8 mol·L^-1 solution to complete transformation.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2016年第1期62-69,共8页
Journal of the Chinese Society of Rare Earths
基金
广东省科技计划项目(2015B010105010)
中国地质调查局大洋调查与研究项目(GZH201100303-05)资助
关键词
太平洋中部
深海粘土
盐酸浸出液
P535
萃取
钇
central pacific
pelagic clay
hydrochloric acid leaching solution
P535
extraction
yttrium
