Extraction of Cesium and Rubidium with 4-tert-butyl-2- (α-methylbenzyl) phenol from Salt Lake Brine

英文关键词:Salk lake brine  Extraction  t-BAMBP  Separation  Cesium  Rubidium

中文摘要:

      

英文摘要:

      This work shows the extraction of cesium (Cs⁺) and rubidium (Rb⁺) from salt lake brine containing potassium (K⁺) and magnesium (Mg²⁺). The results show that 4-tert-butyl-2-(α-methylbenzyl) phenol (t-BAMBP) diluted in sulfonated kerosene (SK) has an excellent extraction effect. Infrared spectroscopic studies indicate that polymerize to form the dimer in the t-BAMBP when Cs⁺ or Rb⁺ were extracted. The effects of K⁺, Mg²⁺, t-BAMBP concentration, the volume ratio of organic phase to aqueous phase (O/A) and the alkalinity (pH) of aqueous phase were investigated. The K⁺ and Mg²⁺ should be eliminated through precipitating before the extraction and separation of Cs⁺ and Rb⁺.The optimum extraction conditions of the experimental brine were as follows:0.8 mol/L t-BAMBP diluted in SK, pH≥13, a phase ratio of 1:1, and an extraction contact time of 2 min at room temperature. The optimal extraction yields of Cs⁺ and Rb⁺ were as high as 100% and 85.8%, in addition, 8.76% of K⁺ was co-extracted. Further work would increase the extraction yield and selectivity of Rb⁺ and realize the efficient separation of Cs⁺ and Rb⁺ from brine.