弱碱性阴离子交换树脂对酸性含铀浸出液中铀的吸附机理  

Adsorption mechanism of weakly basic anion exchange resin for uranium in acidic leaching solution containing uranium

作　　者：闻振乾[1,2] 姚益轩[2] 牛玉清[2] 周根茂[2] 胥国龙[2] 钟宏[1] 

机构地区：[1]中南大学化学化工学院,湖南长沙410083 [2]中国核工业集团公司核工业北京化工冶金研究院,北京101149

出　　处：《中南大学学报（自然科学版）》2016年第6期1867-1871,共5页Journal of Central South University:Science and Technology

基　　金：国家高技术研究发展计划(863计划)资助项目(2012AA061802)~~

摘　　要：研究弱碱性阴离子交换树脂D301处理酸性含铀浸出液的吸附机理,分析D301载铀饱和树脂淋洗异常的原因,优化D301载铀树脂的淋洗参数。研究结果表明:某酸法地浸浸出液中含不同比例的UO_2^(2+),UO_2SO_4,UO_2(SO_4)_2^(2-)和UO_2(SO_4)_3^(4-)等配合物,D301树脂对UO_2(SO_4)_2^(2-)和UO_2(SO_4)_3^(4-)的吸附是离子交换机理,对UO_2^(2+)和UO_2SO_4吸附是表面络合机理,铀酰络合物与树脂以2种不同的化学键结合是导致淋洗曲线出现2个峰的原因;提高淋洗剂酸质量浓度为30 g/L或提高淋洗剂NaCl质量浓度为90 g/L都可以优化淋洗曲线,其中提高淋洗剂NaCl质量浓度更具实际意义。The adsorption mechanism of the weakly basic anion exchange D301 resin treating with the acidic leaching solution contained uranium was studied. The cause for unusual desorption phenomenon of D301 uranium bearing resin was analyzed. The desorption parameters of D301 uranium bearing resin were optimized. The results show that the content of complexes UO_2^2＋, UO_2SO_4, UO_2（SO_4）2^2- and UO_2（SO_4）3^4- are different in an in-situ acid leaching solution.And the adsorption mechanism of D301 resin for UO_2（SO_4）2^2-, UO_2（SO_4）3^4- is ion exchange mechanism, while that for UO_2（SO_4）2^2- and UO_2（SO_4）3^4- is ion exchange surface complex formation mechanism. Double peaks on the eluting curve are caused by two different chemical bonds which combine the uranous complex with the resin. For the desorption solvent, the eluting curve can be optimized by increasing the mass concentration of sulfuric acid to 30 g/L or using a Na Cl solution of 90 g/L, and the latter one has more practicality value.

关 键 词：弱碱性阴离子交换树脂 D301树脂 吸附机理 络合 

分 类 号：TF88[冶金工程—有色金属冶金]