大倾角砂岩型铀矿体地浸开采技术探讨  

Discussion on in-situ leaching mining technology of large dip sandstone type uranium ore body

作　　者：张万亮 苏学斌 张勇 原渊 口文杰 董惠琦 ZHANG Wanliang;SU Xuebin;ZHANG Yong;YUAN Yuan;KOU Wenjie;DONG Huiqi(Tongliao Uranium Co.,Ltd.,CNNC,Tongliao 028000,China;China National Uranium Co.,Ltd.,Beijing 100010,China)

机构地区：[1]中核通辽铀业有限责任公司,内蒙古通辽028000 [2]中国铀业有限公司,北京100010

出　　处：《中国矿业》2022年第10期139-144,共6页China Mining Magazine

摘　　要：国内采用原地浸出采铀技术开采的砂岩型矿床矿体产状多数发育较平缓,矿体倾角一般小于10°。如何针对矿体倾角较大(大于15°)的砂岩型矿体进行原地浸出开采是地浸采铀技术一个重要的研究内容。内蒙古钱家店钱Ⅱ块铀矿床主矿体部分区域受地质断层影响,矿体倾角达25°,给地浸开采提出了难题。在开采过程中通过优化井型布置,在矿体走向方向增加注入井,实现了浸采过程中抽注平衡;选择在矿体倾向方向抽注入井井距30 m,可合理控制浸出剂运移时间,实现较高浸出速率。准确选择目标矿段,精准设计钻孔过滤器位置,实现了矿体的精准开采;合理调控生产运行参数,优化浸出剂配制参数,实现了铀矿体资源的有效浸出。受矿体倾角大的影响,准确把握浸出剂在含矿含水层中的运移路径是进一步掌握大倾角矿体原地浸出的必要技术,建议在后续运行过程中采用示踪剂技术对浸出剂在含矿含水层中的运移路径进行跟踪,确定浸出剂的运移范围,为优化井型、井距布置提供依据,同时为此类铀矿体的开采提供借鉴。The occurrence of most sandstone type ore bodies mined by in-situ leaching uranium mining technology in China is relatively gentle, and the dip angle of ore bodies is generally less than 10°.How to carry out in-situ leaching mining for sandstone type ore body with large dip angle(greater than 15°) is an important research content of in-situ leaching uranium mining technology.Some areas of the main ore body of Qianjiadianqian block II uranium deposit in Inner Mongolia are affected by geological faults, and the dip angle of the ore body reaches 25°,which poses a difficult problem for in-situ leaching mining.In the mining process, by optimizing the well layout and adding injection wells in the direction of ore body strike, the balance between pumping and injection in the leaching process is realized.The well spacing of pumping and injection wells in the dip direction of the ore body is 30 m, which can reasonably control the leaching agent migration time and achieve a higher leaching rate.Precise selection of target ore block, precise design of drilling filter position, and accurate mining of ore body.The effective leaching of uranium ore body resources has been realized by reasonably regulating the production and operation parameters and optimizing the preparation parameters of leachant.Affected by the large dip angle of the ore body, accurately grasping the movement path of the leaching agent in the ore bearing aquifer is a necessary technology for further mastering the in-situ leaching of the ore body with large dip angle.It is suggested that the tracer technology be used to track the movement path of the leaching agent in the ore bearing aquifer in the subsequent operation to determine the movement range of the leaching agent, provide a basis for optimizing the well type and spacing layout, and provide a reference for the mining of such uranium ore bodies.

关 键 词：砂岩型铀矿 地浸采铀 大倾角矿床 开采技术 

分 类 号：TD868[矿业工程—金属矿开采]