某铀矿井下采空区筑堆浸出试验研究

Test research on heap leaching in the goaf of a uranium mine

本文介绍了井下采空区筑堆浸出试验研究的主要成果,该研究是为了解决某铀矿原采用的留矿淋浸法所存在的矿石块度难以控制、浸出效果差的问题而开展的有针对性的试验研究。根据某铀矿井下高柱浸出条件试验成果,确定采空区筑堆浸出试验矿样粒度为-18 mm。采空区筑堆方式采用多点分次进料自然筑堆方式,确保筑堆粒度均匀,矿堆面平整。布液采用矿堆上部微灌喷淋+上盘布液孔局部滴淋的综合方式,减少了矿堆淋浸死角。试验采场矿堆高度18 m,筑堆品位0.0276%,经过184 d的布液淋浸,液计浸出率达到95.00%,渣计浸出率达到88.77%,取得了较好的浸出效果。该技术可应用于该铀矿床实现井下采场堆浸,并可推广应用于其他赣南花岗岩型低品位铀矿床的矿床开发生产中。

This paper introduces the achievements of heap leaching test in the underground goaf.The research is aimed at solving the problems existing in the leaching process,such as the ore block is difficult to control and the leaching efficiency is very low.According to the conditional test result of high column leaching,we determined that the particle size of leaching test is-18 mm.The method of heaping in the goaf is constructed by using multi-point feed.It can ensure that the heap size is uniform and the mine surface is smooth.The solution is used to reduce the dead angle of leaching by using the mixture of the upper micro-irrigation spray and the local drip of the hanging side.The height of the test heap is 18 m and the ore grade is 0.0276%.After 184 days of leaching,the leaching rate calculated by liquid is 95.00%,the leaching rate calculated by tailings is 88.77%.The test achieves better results.This technology not only can be used for underground heap leaching in this uranium mine,but also promoted to other low grade granite type uranium mine in the south of Jiangxi province.