砂岩型铀矿床地浸地质工艺性能综合定量评价指标——地浸指数的设计与应用

Design and application of in-situ leach index——an integrated quantitative index of evaluation for geological-technological feature about in-situ leach uranium mining from sandstone-type uranium deposits

从砂岩型铀矿床地浸开发工艺着手 ,通过对其地质影响因素分析 ,结合各因素对地浸开发的影响程度 ,提出了砂岩型铀矿床地浸的地质工艺性能综合评价指标———地浸指数 (LI) ,并建立了其计算模型。通过计算地浸指数可定量地了解待开发矿床或块段的地浸开发适宜程度。地浸指数LI值越大 ,说明该矿床地浸的地质工艺性能越佳、越有利于地浸开发。通过对伊犁盆地 5 1 2模型铀矿床、 5 1 1铀矿床及吐哈盆地十红滩铀矿床的LI值试算 ,得到的LI值分别为 1 1 9 95、 1 0 2 5 6和 47 81。试算结果表明 ,5 1 1矿床很有利于地浸开发 ,5 1 1矿床地浸开发的有利性逊于 5 1 2矿床 ,十红滩矿床属于不利于地浸的范畴 ,建议放弃酸法地浸方案 ,寻求低酸法地浸、清水地浸或碱法地浸等方案。结合 3个矿床的工业开发实际和前期试验成果 ,初步确定砂岩型铀矿床地浸地质工艺性能的LI值区间 :LI≥ 1 0 0 ,很有利于地浸 ;80≤LI<1 0 0 ,有利于地浸 ;LI<80 ,不利于地浸。

Starting with the in situ leach mining technology and based on the analysis of other geologic effecting factors combined with the impact of various factors to in situ leach mining,authors of this paper propose an integrated quantitative index for geological technological evaluation for in situ leach mining of sandstone type uranium deposits--the in situ leach index (LI),and have developed its calculation model.Knowing the value of LI,the suitability of the deposit(block)to be exploitated to the in situ leach mining can be quantitatively assessed.The bigger the LI value,the more favourable the deposit is for in situ leach mining,and the better the geologic technologic properties of ores are.Then,the LI values for uranium deposits No.512 and 511 in Yili basin,Shihongtan uranium deposit in Turpan Hami basin have been calculated,and they are 118 42(uranium deposit No.512),102 44(uranium deposit No.511)and 47 81(Shihongtan uranium deposit)respectively.The figures indicate that uranium deposit No.512 is the most favourable for in situ leach mining,and the uranium deposit No.511 is the second favourable.Shihongtan uranium deposit is unfavourable ones.Taking into consideration of the practice of commercial mining and test results at those deposits authors propose the following categories of LI value with respect to in situ leach mining:LI≥100,deposit is very favourable for in situ leach mining;80≤LI<100-it is favourable;LI<80 it is not suitable for in situ leach mining.