砂岩铀矿床钻孔水力冲采模拟试验研究

Simulation Experiment of Borehole Hydraulic Mining in Sandstone Uranium Deposit

针对中国北方大量胶结、低渗透砂岩铀矿资源难以采用常规方法和地浸方法开采的技术难题,提出钻孔水力开采的新思路。根据钻孔水力开采工艺技术特点,并结合某砂岩型铀矿床实际地质条件,对水力冲采过程中的高压水射流破岩机制进行探索,通过水力冲采模型试验相似率研究,建立了水力冲采试验模型。为了分析矿岩强度、水射流工作压力、喷头作业形式与水力冲采效率的关系,进行了三因素三水平正交试验,并采用极差分析法及方差分析法进行了分析,确定了较优的水力冲采工作条件,以期为砂岩铀矿床钻孔水力开采现场试验提供依据和试验基础。

In view of the large amount of cementing low permeability sandstone uranium resources in northern China,which is difficult to use the conventional mining method and nor does the in-situ leaching,a new idea of borehole hydraulic mining is proposed.Based on the characteristics of borehole hydraulic mining technology and combined with the actual geologic conditions of one sandstone-type uranium deposit,the mechanism of high pressure water jet in the process of hydraulic mining is explored,and hydraulic mining model is set up by study on the similarity of hydraulic mining simulated test.In order to analyze the relationships among the strength of ore and rock,the working pressure of water jet,the working pattern of nozzle and the efficiency of hydraulic mining,the orthogonal tests of three factors and three levels were carried out and range analysis and variance analysis methods were adopted.The better working condition of hydraulic mining was determined,which can provide foundation and experimental basis for the field test of borehole hydraulic mining for sandstone uranium deposit.