淡化地下水对缓解某矿床地浸化学堵塞的探讨

The effect of diluting groundwater on chemical sedimentation in alkaline in-situ leaching of a uranium deposit of Xinjiang

基于地球化学模式计算结果,分析某矿床采用常规酸法和碱法地浸工艺失败的原因,说明在该矿床地浸前进行淡化的必要性。室内和现场试验结果表明,淡化作用对防止硫酸钙沉淀有良好的效果,同时,只要适当地控制pH,也不会导致碳酸钙沉淀。淡化效果受流体混合作用和盐离子综合体的溶解作用影响,但总体效果影响不大。因此,用淡化地下水方法解决该铀矿床地浸化学堵塞问题,进行有效浸出是可行的。

Abstract. Based on the results computed by a geochemistry model, the unsuccessful reasons in acid and alkaline in-situ leaching of a uranium deposit of Xinjiang are analyzed. The necessity of diluting groundwater during leaching is pointed out. The results of laboratory and field tests indicate that the precipitation of CaSO4 and CaCO3 can be avoided by diluting groundwater. The dilution can be weakened by the mixing process of different liquids and dissolving process of mineral substances, but the effect can be neglected. Consequently, it is feasible to avoid chemical sedimentation during in-situ leaching by diluting groundwater.