TBP-泡塑填料柱萃取回收铁钍渣浸出液中钍的研究

STUDY ON RECOVERY OF TH4+ FROM LEACHATE OF FERROTHORIUM SLAG BY THE TBP\|FOAMED PLASTICS COLUMN EXTRACTION

将ＴＢＰ固定在改性泡塑载体上，用于萃取回收铁钍渣硝酸浸出液中Ｔｈ４＋。试验表明：ＴＢＰ泡塑填料萃取分配比高，萃取容量大，当溶液硝酸浓度为４ｍｏｌ／Ｌ，接触时间１０ｍｉｎ时，萃余液中Ｔｈ４＋浓度小于００１ｍｇ／Ｌ，反萃液中Ｔｈ３＋浓度达８４ｇ／Ｌ，Ｆｅ３＋和Ｃｅ３＋浓度小于０１ｍｇ／Ｌ，萃取容量为ＴＢＰ泡塑填料１ｇ可萃取Ｔｈ４＋０２８ｇ；ＴＢＰ泡塑填料化学性质稳定，分相容易，能有效防止乳化现象。

Tributyl phosphate (TBP) is fixed to foamed plastic carrier and the TBP column filling is used for extraction of Th4+ in nitric acid leachate of ferrothorium slag.The results show that the TBP\|foamed plastic column filling has a high extractive efficiency to the Th4+ ion.When concentration of the nitric acid in the solution is 4mol/L and contact time is 10min,the concentration of Th4+ in the extraction raffinate is lower than 0.01mg/L,and the extraction capacity is about 280mg/g.The ion concentrations in the strip Liquor are:Th4+=84g/L,both Fe3+and Ce3+ less than 0.1mg/L.The chemical properties of the filling are stable.It is available to prevent the water and TBP from emulsifying.