NH_4HCO_3沉淀法制备优质铀浓缩物的研究  

STUDY ON PREPARING HIGH QUALITY URANIUM CONCENTRATE BY NH_4HCO_3 PRECIPITATION

作　　者：刘国宏[1] 林嗣荣[1] 陆诗洁[1] 

机构地区：[1]核工业北京化工冶金研究院,北京101149

出　　处：《铀矿冶》2003年第4期178-182,共5页Uranium Mining and Metallurgy

摘　　要：描述了以碳酸氢铵为沉淀剂从酸性硝酸铵淋洗合格液中沉淀铀的反应机理,探索了温度、pH值、加料速度、搅拌强度、浆体返回次数对沉淀产品的影响。在温度60℃、pH5 6～5 8时,ρ(NH4HCO3)为150g/L。恒pH连续沉淀,在100℃下维持10min驱除CO2,沉淀母液中ρ(U)<10mg/L,产品中w(U)在70%左右,w(SO42-)为0 65%,w(H2O)为25 2%,优于1998年颁布的一级品标准。The reaction mechanism precipitating uranium from the acid eligible solution eluted by NH4NO3 is described using NH4HCO3 as precipitant.The effects of the temperature, pH value, velocity of adding solution, mixing intensity, return times of the serosity on the precipitate are also studied. At 60 ℃, the acid eligible solution is precipitated at the same pH value of 56～58 and the NH4HCO3 precipitants concentration is 150 g/L. Then, maintaining the temperature at 100 ℃ for 10 minutes, CO2 is got rid of from the solution. The obtained mother solution contains uranium less than 10 mg/L. The quality of the product, with the uranium content about 70%, SO42- 065% and water 252%, is better than the first class standard issued in 1998.

关 键 词：铀 碳酸氢铵 沉淀 NH4HCO3 浓缩物 制备方法 

分 类 号：TL212.33[核科学技术—核燃料循环与材料]