酸法地浸采铀浸出剂的减量化控制与应用

针对酸法地浸采铀工艺特点,从采区不同溶浸阶段、满足铀矿石浸出要求、围岩成分及矿层堵塞等方面讨论了浸出剂酸度控制的影响因素及酸耗的主要来源,探讨了浸出剂酸度的控制方法。结果表明:酸法地浸中,酸耗的主要来源为方解石、铁氧化物、硫化物、绿泥石等非铀矿物,应优先考虑低酸浸出,并在不同浸出阶段适当调减浸出剂酸浓度,以满足浸出液中剩余硫酸浓度为0.5～2.0g/L较为合适。511矿床实际应用中,溶浸期浸出剂酸度为5g/L左右、溶浸末期为2～3g/L可满足生产需求。

Reduction Control and Its Application of Leaching Agent for Acid Leaching In-situ Leaching Uranium Mine

In view of the characteristics of acid leaching of uranium mine, the factors affecting the acidity control of the leaching agent and the main source of acid consumption are discussed from the different leaching stages of the mining area, the requirements for the leaching of uranium ore, the composition of the surrounding rock and the blockage of the ore layer. And the control method of the acidity of the leaching agent is discussed. It concludes that the main source of acid consumption in acid leaching is calcite, iron oxide, sulfide, chlorite and other non-uranium minerals. The low acid leaching should be considered first, and it is appropriate to reduce the concentration of the leaching agent in different leaching stages to meet the concentration of the remaining sulfuric acid in the leaching solution of 0.5 to 2. In the practical application of the deposit No.511, the acidity of the leaching agent is about 5 g/L during the leaching period, and the final stage of dissolution is 2~3 g/L, which can meet the production needs.