Abstract:Disposal of strong alkaline high silicate and sulfate-containing uranium solutions produced during resin desilication in uranium mines by acid leaching was carried out. A technical solution was proposed to use calcium oxide to solidify SiO32-, SO42-, and CO32- in solution, wash residue with sulfuric acid, and comprehensively utilize desiliconization solution. This scheme can realize the recovery of impurities, uranium and regeneration and utilization of lye. The results show that removal rate of impurity ions in solution is 85% above and precipitation rate of uranium reaches 76.92% under the conditions including reaction temperature of 20 ℃, reaction time of 180 min, and dosage of calcium oxide of 1.05 times of theoretical amount of chemical reaction. The ratio of input of calcium oxide to output of sodium hydroxide is 0.86, and reused solution meets the requirements for preparing silicon removal agent. It can dissolve and recover 96.25% of uranium by using sulfuric acid to dissolve residue and control concentration of sulfuric acid above 10 g/L.