TBP对含钛原料酸浸液中盐酸的萃取分离

Solvent extraction and separation of hydrochloric acid by TBP from acid leaching solution of titanium-bearing ores

研究了TBP(磷酸三丁酯)对盐酸的萃取和反萃性能。萃取过程研究和红外光谱分析结果表明:盐酸以TBP·HCl的形式进入有机相,萃取速度很快,一分钟达萃取平衡。盐酸萃取率随萃取剂浓度的增加而增加,而对钙、镁、铝无萃取性能,可实现含钛原料酸浸液中盐酸的萃取分离。以水为反萃剂,可有效反萃萃取液中的盐酸。模拟逆流萃取,绘制了以100%TBP为萃取剂,对6 mol·L^(-1)盐酸进行萃取的萃取-反萃等温线。

The solvent extraction and stripping of hydrochloric acid by TBP（ Tributyl phosphate） has been investigated.The results of solvent extraction and infrared spectroscopy analysis demonstrated that the extracted hydrochloric acid was present as TBP·HCl in extraction solution.The kinetics of the extraction process was very fast,since the equilibrium was reached in 1 min.Extraction of hydrochloric acid increased with increased TBP concentration in the organic phase.On the other hand,calcium（ Ⅱ）,magnesium（ Ⅱ）and aluminum（ Ⅲ） were not extracted under these experimental conditions.And the separation of hydrochloric acid from acid leaching solution of titanium-bearing ores was realized. Hydrochloric acid can be effectively stripped from the loaded organic phase by H2 O.Extraction and stripping isotherms were obtained using TBP as extractant with 6 mol dm-3hydrochloric acid.