低品位硬岩铀矿石高柱浸出试验

HIGH COLUMN LEACHING EXPERIMENT ON LOW-GRADE URANIUM ORE FROM A HARD ROCK DEPOSIT

对某硬岩铀矿石进行了10m高柱浸出条件试验,以便为原地破碎浸出采铀的工业性试验方案和施工设计提供参考和依据。试验结果表明,该矿石属较易浸出的矿石,不同高度、不同粒级的浸出液铀金属质量浓度、浸出率及酸耗规律明显:①高柱下部位置的铀金属质量浓度较高,特别是浸出初期浓度梯度变化显著,随着时间的延长,同一高度浸出液铀浓度变化趋缓。②不同高度的浸出液余酸变化规律说明前期耗酸多,中、后期酸耗较少。③越靠近矿堆上部的矿石浸出率越高,但顶部并非最高。④不同粒级的矿石浸出率不同,细粒级矿石浸出率高,-50mm的矿石的渣计浸出率(总浸出率)为82 1%,其中-15mm的矿石的渣计浸出率为90 2%。作者还建议采用间歇喷淋或滴淋布液方法,以提高矿堆浸出效果。

In order to provide a reference for commercial experiment on stope leaching in a certain hard rock uranium deposit,conditional experiments were done in a column of 10m height.It is indicated that leaching of the uranium in ore is easy and distinct rules of uranium concentration, leaching yield and acid consumption in leaching solution for different column heights and particle sizes are that:①the uranium concentration at the bottom is higher than other parts and changes dramatically in initial leaching days but uranium concentration at same height drops steadily as time goes on;②the acid consumption in early days is more than that in medium and final stages;③the nearer to the top the ore is,the higher the leaching yield,but not the highest at the top;④the leaching yield increases as particle size of ore become fine,with an uranium extraction yield of 82.1% on residue for particle size of -50mm and 90.2% on residue for particle size of -15mm in it.It was suggested that intermittent sprinkling or dripping irrigation should be used to increase the leaching yield.