新疆某含铀多金属矿浸铀工艺研究

采用新疆某含铀多金属矿石,进行了矿石粒度、酸浓度、氧化剂种类及浓度、液固比对铀浸出效果的影响的搅拌浸出试验和柱浸试验,结果表明,该矿石适合酸法浸出,浸出性能好,属易浸矿石;矿石中CaO含量高导致酸耗较高,达到9%以上;酸法浸铀过程中BeO浸出很少,可考虑对浸铀渣进行BeO的提取利用;矿石粒度对浸出效果有较大影响,小粒级矿石浸出率高,浸出周期短,液固比小,但酸耗较高;氧化剂的加入对铀浸出率影响很小;矿层高度对浸出效果有一定影响,矿层高度越大,酸耗较低,液固比越小。为了提高堆浸技术经济指标,生产实际中可考虑增加堆高或串堆浸出,并在浸出中后期采取淋、停交替作业以及翻堆等措施。

Research on uranium leaching of some uraniferous ploymetallic ore in Xinjiang

The ploymetallic uranium ore from Xinjiang was processed and the influences of particle size,sulphuric acid concentration,types and concentration of oxidants,and the ratio of liquid to solid on uranium leaching were investigated and discussed by agitation leaching test and cylinder leaching test.The result shows that the ore,with a good leaching effect,is suitable for acid leaching and belongs to easy-leaching ore;the ore,with high content of CaO,leads to high acid consumption,reaching more than 9%;in the process of acid leaching of uranium,BeO leaches rarely,which may be considered for extracting and using of BeO;the particle size index affects greatly the leaching effect—small grade ore has a high leaching rate and short leaching cycle,but high consumption of acid;the addition of oxidant has little effect on uranium leaching rate;the seam height has effects on uranium leaching,the greater the height,the lower the acid consumption and the smaller ratio of liquid to solid.In order to improve the technological and economic indexes of heap leaching,in the actual production,it may be considered to increase the usage of high stack or heap leaching and during the middle and later process of leaching,showering stopping and other measures may be alternatively used.