Cesium Extraction from Brine by 4-tert-butyl-2-(a-methylbenzyl)Phenol-di-(2-ethylhexyl)Phosphoric Acid Synergetic System
Cesium is an important strategic resource.Solvent extraction method has been widely applied in the separation and extraction of cesium due to the advantages of high efficiency,low cost,large processing capacity.When 4-(tert-butyl)-2-(α-methylbenzyl)phenol(t-BAMBP)extraction system is used to sepa-rate and extract cesium,strong alkaline extraction raffinate will be produced,which makes the extraction and separation of cesium using this extraction system will face many difficulties,such as ecological damage and cost increase.Especially for the ecology of the salt lake,it is a great challenge.In this paper,the pro-cess of extraction and separation of low-grade cesium from salt lake,by 4-(tert-butyl)-2-(α-methylbenzyl)phenol(t-BAMBP)/Di-(2-ethylhexyl)phosphoric acid(P204)synergistic extraction system,was carried out and the process conditions of extraction and stripping were investigated and optimized.The results show that with the organic phase of 1mol·L-1 t-BAMBP and 0.05mol·L-1 P204,the extraction efficiency of Cs could reach 92.62％through the 3-stage counter-current extraction experiment under the phase ratio of 4/1.At the phase ratio of 15/1,97.27％of cesium was stripped by 0.5 mol·L-1 HCl through 3-stage counter-current stripping experiment and the salt lake brine with cesium content could be enriched to 2.16 g·L-1 in the stripping liquor.This study provides a new process method for the enrichment of low-grade cesium from the salt lake brine,expands the application field of extraction and separation of cesium by solvent extrac-tion,which is of great significance for the exploitation and utilization of low-grade cesium resources and the security of strategic resources in China.
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