地浸采铀过程中的矿物溶解沉淀特征  

Characterization of Mineral Dissolution Precipitation during Uranium In-situ Leaching

作　　者：丰章哲 刘金辉[1] 阳奕汉 王如意 刑拥国 梁大业 FENG Zhangzhe;LIU Jin-hui;YANG Yi-han;WANG Ru-yi;XING Yong-guo;LIANG Da-ye(School of Water Resources and Environmental Engineering,East China University of Technology,Nanchang 330013,China;Inner Mongolia Mining Co,Ltd,CNNC,Huhhot 010010,China;China Nuclear Mining Technology Co.,Ltd.,Beijing 101149,China)

机构地区：[1]东华理工大学水资源与环境工程学院,南昌330013 [2]中核内蒙古矿业有限公司,呼和浩特010010 [3]中核矿业科技有限公司,北京101149

出　　处：《有色金属（冶炼部分）》2022年第10期72-80,共9页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(U1967209);中国铀业有限公司—东华理工大学核资源与环境国家重点实验室联合创新基金资助项目(NRE-17)。

摘　　要：铀的原位浸出是通过溶浸液与铀矿物相互作用来实现的,地浸采铀过程中溶浸液与含矿层中各种矿物反应,会使溶浸液中各种离子组分大量增高,当离子浓度达到饱和或过饱和时,又会产生化学沉淀,造成含矿层堵塞。以巴彦乌拉铀矿C12采区为研究对象,根据浸出液化学成分数据,通过地球化学模拟计算采区运行过程中矿物饱和指数,研究地浸过程中矿物的溶解-沉淀特征。计算结果表明,酸法地浸过程中石膏、Fe(OH)_(3)、针铁矿和赤铁矿是地浸采铀过程中易产生沉淀的矿物。地浸6.5天后石膏即处于沉淀状态;Fe(OH)_(3)在pH大于6.71~6.89条件下、针铁矿在pH大于4.6~5.0条件下、赤铁矿在pH大于4.62~4.87时处于沉淀状态。pH是影响矿物溶解与沉淀的关键因素。Uranium in-situ leaching is achieved by interaction between leaching solution and uranium minerals.The reaction between leaching solution and various minerals in ore-bearing layer during the process of uranium extraction by in-situ leaching will cause greatly increase of various ionic components in leaching solution, and when the ionic concentration reaches saturation or supersaturation, chemical precipitation will be produced to cause blockage of ore-bearing layer.The dissolution-precipitation characteristics of minerals during in-situ leaching were studied by calculating mineral saturation index during operation of mining area through geochemical simulation based on chemical composition data of leaching solution in the C12 mining area of Bayan-Ula uranium mine.The calculation results show that gypsum, Fe(OH)_(3),goethite, and hematite are easy to precipitate during uranium in-situ leaching.After 6.5 days of in-situ leaching, gypsum is in a state of precipitation.Fe(OH)_(3),goethite and hematite are in the precipitation state when pH value is greater than 6.71—6.89,4.6—5.0 and 4.62—4.87,respectively.The key factor affecting dissolution and precipitation of minerals is pH value.

关 键 词：地浸采铀 巴彦乌拉铀矿 模拟计算 矿物沉淀-溶解特征 PH 

分 类 号：TL212.12[核科学技术—核燃料循环与材料]