一种强碱性树脂脱硅液的综合利用技术研究

Research on Comprehensive Utilization Technology of a Strong Alkaline Resin Desiliconizing Liquid

针对酸法地浸采铀矿山树脂脱硅作业过程中产生的强碱性高硅酸根、硫酸根的含铀溶液的处置开展了研究。提出利用氧化钙固化溶液中的SiO_(3)^(2-)、SO_(4)^(2-)、CO_(3)^(2-),使用硫酸洗涤残渣进行脱硅液综合利用的技术方法。应用结果表明,该方法可实现杂质的固化、铀的回收和碱液的再生利用。在反应温度为20℃、反应180min、氧化钙投加量达到化学反应理论用量的1.05倍的条件下,溶液中杂质离子的去除率在85%以上,铀沉淀率达到76.92%,氧化钙的投入与氢氧化钠的产出比为0.86,回用的溶液满足配制脱硅剂需要。使用硫酸溶解残渣并控制硫酸浓度在10g/L以上,可溶解并回收其中96.25%的铀。

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 SiO_(3)^(2-),SO_(4)^(2-),and CO_(3)^(2-)in solution,wash residue with sulfuric acid,and comprehensively utilize desiliconization solution.This scheme can realize the solidify of impurities,recovery of 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 1.05times 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 10g/L.