期刊论文

Effect of microwave pretreatment on leaching behavior of uranium in heap-leached uranium tailings and its mechanism

Ding, De-Xin(dingdxzzz@163.com)

中文

中国有色金属学报

1004-0609

2016

26

6

1356-1363

10.19476/j.ysxb.1004.0609.2016.06.025

核能开发科研项目 国家自然科学基金重点项目（U1401231） 南华大学校级创新团队计划项目

本校为通讯机构

堆浸铀尾渣中铀含量普遍高于0.02%,为了降低铀尾渣中的铀含量,采用频率为2450 MHz工业微波对铀尾渣进行了预处理,考察微波功率、辐照时间和尾渣质量对铀尾渣浸出行为的影响,探讨微波预处理提高铀尾渣中铀的浸出率的机理。结果表明:微波预处理的最佳条件为2.5 kg铀尾渣在50 kW功率下辐照30 s,此时铀浸出率达到80.12%,相比未经预处理时的铀浸出率75.63%提高了4.49%。一定条件下的微波辐照促使铀尾渣中铀的价态和赋存形态向有利于浸出的方向转化,经30 kW功率微波辐照30 s后,相比对照组尾渣中U(Ⅳ)比例下降了17.78%;经20 kW功率微波辐照30 s后, 相比对照组尾渣中弱酸提取态铀比例提高了15.55%。MLA分...

Heap-leached uranium tailings usually contain uranium more than 0.02%. In order to lower the content of uranium, the uranium tailings were pretreated by 2450 MHz industrial microwave. The factors, including microwave power, irradiation time and tailings mass, which influence on the leaching behavior of uranium tailings, were investigated, and the mechanism of microwave pretreatment on improving extraction of uranium from uranium tailings was discussed. The results show that the optimal pretreatment condition are the microwave power of 50 kW, the irradiation time of 30 s, the tailings mass of 2...