Abstract

Dissolution of uranium and rare earth elements from the Abu-Tartur phosphate rocks, Egypt using a mixed EDTA + nitric acid solution was studied. The effect of factors such as particle size, EDTA and nitric acid concentrations, agitation time, solid to liquid ratio, and dissolution temperature was studied, and the dissolution conditions were optimized. The optimized dissolution conditions were applied to a representative sample of the weathered rock assaying 1067 ppm rare earth elements. Before being processed, the representative sample was completely characterized using mineralogical and chemical analyses. From the obtained leach liquor, uranium was recovered by anion exchange with Duolite A 101D resin, and after uranium adsorption the rare elements were recovered by cation exchange with Dowex 50W-X8 resin.

中文翻译：

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用 EDTA 和硝酸溶液从西部沙漠磷酸盐岩中回收铀和稀土元素

摘要

研究了使用混合 EDTA + 硝酸溶液从埃及 Abu-Tartur 磷酸盐岩中溶解铀和稀土元素。研究了粒径、EDTA和硝酸浓度、搅拌时间、固液比、溶解温度等因素的影响，优化了溶解条件。将优化的溶解条件应用于风化岩的代表性样品，测定 1067 ppm 稀土元素。在处理之前，代表性样品使用矿物学和化学分析进行了完整表征。从得到的浸出液中，用Duolite A 101D树脂进行阴离子交换回收铀，吸附铀后用Dowex 50W-X8树脂进行阳离子交换回收稀有元素。