低品位低碳酸盐砂岩型铀矿石低酸浸出工艺

Low Acid In-Situ Leaching Process for Low Grade Low Carbonate Sandstone-Type Uranium Ore

针对用常规酸法地浸工艺不能经济开采的某低品位、低碳酸盐砂岩型型铀矿石，通过室内工艺试验，提出降低溶浸液酸浓度，在溶浸液ρ（H2SO4）=2—5g/L条件下浸出，浸出率可达到93％以上，酸耗为2—9kg／t；与高酸浓度溶浸液（ρ（H2SO4）=10g／L以上）浸出相比，浸出率相近，而酸耗降低了4．5kg／t以上，有利于浸出液的后处理和开采结束后的地下水复原。该工艺有较好的经济效益、社会效益和环境效益。

In view that the conventional acid in-situ leaching method can not economically exploit a low grade low carbonate sandstone-type uranium ore, it is proposed, through the laboratory technology research, to use a leaching solution of lowered acid concentration. Under the condition of ρ （ H2SO4 ） = 2 - 5 g/L, the leaching rate can be over 93% with an acid consumption of 2 -9 kg/t. Compared to the leaching with higher acid concentration solution （ ρ （H2SO4 ） = over 10 g/L）, the low acid leaching can reduce the acid consumption by over 4.5 kg/t at a similar leaching rate, which is beneficial to the after-treatment of the leaching solution and the underground water restoration when the mining is completed. This process can be said to have good economic, social and environmental benefits.