哈萨克斯坦某古河道砂岩型铀矿钻孔地浸法采铀工艺技术研究

地浸采矿因能较好地回收常规开采方法不能回收的低品位矿石,且开采成本低,对环境污染程度小,显示出了广阔的应用前景。笔者总结了多年来一直在哈萨克斯坦从事古河道砂岩型铀矿床酸法钻孔地浸开采的经验,成井工艺、工艺孔修复、添加氧化剂等钻孔地浸工艺技术,认为:采用行列式形式的开采单元,并将部分注液孔设计为抽液孔,可使浸出率提高。采用浓度60%的双氧水(H2O2)作为氧化剂,可以提高溶浸液Fe3+离子浓度,加快四价铀(U4+)转化六价铀(U6+)的速度,提高浸出率,减少硫酸消耗,总体上降低生产成本。

The Study of Uranium Operation, with In Situ Borehole Leaching Technolgoy, for a Paleochannel Sandstone-type Uranium Deposit in Kazakhstan

For the reason that in-situ leaching mining can furthest recover the low grade ore as well as realize low cost and little contamination to the environment, so it shows a great potential in the future. The author summarized the experiences of long-term working on a paleochannel sandstone-type uranium deposit in Kazakhstan by using in-situ leaching mining technology and its well completion technology, hole repair, adding oxidant etc. It thought that it can increase the leaching rate by using determinate type units and transferring parts of the injection well to pumping well. Meanwhile, it also can increase the ionic concentration ofleaching liquid (Fe3 ) , accelerate the transform of Uranous (U4 ) to Uranic(U6 ) and increase the leaching rate and decrease the consumption of vitriol by using the H2O2 with the concentration of 60%,finally to realize the purpose of cost reduction.