中性地浸采铀全流程溶液中颗粒粒径分布及过滤建议  

Particle Size Distribution and Filtration Suggestions in the Whole Process Solution of Neutral In-situ Leaching of Uranium

作　　者：王亚安 原渊[1] 程威[1] 李光辉 张欢 赵利信 邹玉涵 霍建党[1] WANG Yaan;YUAN Yuan;CHENG Wei;LI Guanghui;ZHANG Huan;ZHAO Lixin;ZOU Yuhan;HUO Jiandang(Beijing Research Institute of Chemical Engineering and Metallurgy,Beijing 101149,China;CNNC Inner Mongolia Mineral Co.,Ltd.,Hohhot 014010,China)

机构地区：[1]核工业北京化工冶金研究院,北京101149 [2]中核内蒙古矿业有限公司,内蒙古呼和浩特014010

出　　处：《铀矿冶》2024年第2期39-46,共8页Uranium Mining and Metallurgy

基　　金：中核集团青年英才项目(地浸采铀新型地表固液分离系统研发及应用)。

摘　　要：掌握中性地浸采铀全流程溶液中颗粒大小,对调控浸出过程、优选过滤器、确定除固位置、缓解矿层堵塞、恢复抽注液量和减轻树脂床层板结等具有指导意义。以内蒙古纳岭沟矿床中性地浸采铀全流程溶液为对象,基于激光粒度仪测试数据,获取了全流程溶液中颗粒粒径分布规律。结果表明,浸出液中颗粒粒径频率分布曲线呈非对称性,累计分布曲线呈“S”型,粒径分布范围窄,最大颗粒粒径<100μm;树脂床层对颗粒物有较强的过滤作用,吸附尾液过滤器的滤袋精度应根据树脂粒径大小和系统压力确定;中性体系中加入的O 2或CO 2对颗粒粒径影响微弱;淋洗合格液和沉淀罐中母液的颗粒粒径频率分布曲线均呈“双峰”型,贫液中颗粒粒径频率则呈正态分布;母液槽中颗粒最大粒径约为40μm。建议该矿床原液袋式过滤器的滤袋精度选用10~50μm,同时在母液槽与淋洗剂配制罐之间增加10~20μm精度的过滤器。Mastering the particle size in the solution throughout the neutral in-situ leaching process has guiding significance for regulating the leaching process,optimizing filters,determining the position of solid removal,alleviating ore bed blockage,restoring the flow rate of injection liquid,and reducing resin bed stratification.For this purpose,the whole process solution of neutral in-situ leaching of uranium from the Nalinggou deposit in Inner Mongolia was taken as the object,and based on laser particle size analyzer test data,the particle size distribution in the solution was obtained.The results show that the frequency distribution curve of particle size in the leaching solution is asymmetric,and the cumulative distribution curve is in an“S”pattern.The particle size distribution range is narrow,and the maximum particle size is less than 100μm.The resin bed layer has a strong filtering effect on particulate matter,and the accuracy of the tail liquid filter bag should be determined based on the size of the resin ball and system pressure.The addition of O 2 or CO 2 in neutral systems has a weak effect on particle size.The particle size frequency distribution curves of both the qualified solution and the masterbatch solution in the settling tank exhibit a“double peak”pattern,while the lean solution exhibits a normal distribution.The maximum particle size in the mother liquor is about 40μm.It is recommended to choose a precision of 10~50μm for the leaching solution bag filter,and simultaneously add a 10~20μm precision filter between the mother liquor tank and the eluent preparation tank.This study reveals the particle size distribution pattern in the whole process solution of the Nalinggou deposit,enriching the understanding of the particle size of neutral in-situ leaching of uranium,and providing a basis for optimizing surface filtration technology in mines.

关 键 词：中性地浸采铀 全流程 粒径 频率分布 累计分布 地表过滤 

分 类 号：TD853[矿业工程—金属矿开采] TQ028[矿业工程—矿山开采] TL212[化学工程]