某高品位铀矿石淋滤浸出研究

对主要以沥青铀矿形式存在的某硅酸盐铀矿石，用二氧化锰作氧化剂，硫酸高铁溶液作浸出剂进行淋滤浸出研究。采用两段逆流淋滤浸出，含铀和铁的浸出液送至预浸段，浸出液中铁沉淀在新矿石堆中。酸加到主浸段，将沉淀铁溶解作为硫酸高铁浸出剂。与搅拌浸出比较，淋滤浸出省酸２１％、省二氧化锰２９％，铀提取率降低１．８６％。

STUDY ON TRICKLE LEACHING OF A HIGH-GRADE URANIUM ORE

The trickle leaching process for a high--grade silicate uranium ore existing mainly as uraninite form has been studied. Two--stage counter--current trickle leaching with manganese dioxide as oxidant and ferric sulphate solution as leaching agent is used in the process. The leached solution which contains dissolved uranium and iron is carried back to the neutralizing stage and the iron is precipitated in this stage. The acid is added to the main stage and the precipitated iron is dissloved into Fe2(SO4)3 serving as lixiviant in the stage. Compared with conventional agitation acid leaching method,this process decreases the acid consumption by 21 % and manganese dioxide by 29%,the extraction rate of uranium reduces by 1. 86%.