硝酸盐在地浸采铀中的氧化性能研究

Research on Nitrate's Oxidizing Property in Insitu Leach of Uranium

在铀矿的原地浸出开采中 ,人们普遍采用氧 (O2 )或过氧化氢 (H2 O2 )作为溶浸氧化剂 ,用氯化钠溶液作为饱和树脂淋洗剂 .但用氧作为氧化剂需要加压系统 ,用过氧化氢作为氧化剂则存在过氧化氢易分解的问题 ,它们都使生产成本降不下来 .为了寻找一种既有效又廉价的氧化剂以降低生产成本 ,本文从热力学理论的角度分析了硝酸盐作为溶浸氧化剂的可能性 ,并通过试验研究了硝酸盐作为溶浸氧化剂的条件和动力学性能 .结果表明 ,在酸性条件下 。

Generally, oxygen or hydrogen peroxide, as leaching oxidant, and sodium chloride solution ,as elutriant of saturated resin, have been applied to in-situ leach of uranium so far. But a set of pressor equipment is needed when oxygen is used as oxidant; Meanwhile, hydrogen peroxide is a compound that decomposes easily. Using the two oxidants above will prevent the cost of production from being cut down.To seek an oxidant ,which is not only effective but also low-cost,the paper has discussed in thermodynamic theory the possibility to use nitrate as leaching oxidant, and also researched the oxidizing conditions and dynamic property by experiment. It is indicated that in acid environment nitrate solution is able to satisfy the demand of in-situ leach of uranium completely.