Abstract:Potassium removal test was carried out on high-salt concentration waste solution containing rubidium and cesium by t-BAMBP sulfonated kerosene organic system, and then experimental study on extraction separation was carried out. Effects of aluminum sulfate dosage and pH value on potassium removal were explored. Effects of pH value, extractant concentration, extraction time, extraction phase ratio and extraction order on extraction rate of rubidium and cesium during extraction, and effects of washing ratio and washing order on elution rate of rubidium and cesium in washing process were investigated. The results show that extraction rate of cesium can reach 99.95% when pH value of the material solution is 12.5, extraction ratio is O/A=1, and extracted at room temperature for 5 min with 1 mol/L extractant. The 11-stage extraction (6-stage extraction, 3-stage washing, and 2-stage stripping) continuous test was carried out on high-salt concentration waste solution. Extraction rate of cesium in organic phase is 99% above, and 65% of rubidium remains in aqueous phase, which rubidium and cesium can be well separated. Finally, cesium chloride product with 98.3% purity is prepared.