Study on preparation and application of novel saponification agent for organic phase of rare earths extraction

冯宗玉，黄小卫，刘洪吉，王猛，龙志奇，于瀛，王春梅

National Engineering Research Center for Rare Earth Materials, General Research Institute for Nonferrous Metals, and GRIREM Advanced Material Co., Ltd.

摘 要：In view of the problem of ammonia-nitrogen wastewater pollution in rare earths extraction and separation, the novel saponification agent of organic phase, which is magnesium bicarbonate solution, was prepared with the natural rich and cheap dolomite as raw material through carbonation process. The behavior and purification of main impurities ions in the carbonation process as well as the application effect of the novel saponification agent in the extraction and separation was researched. The results showed that the concentration of Fe, Al, Si impurities ions was less than 5 ppm in the saponification agent through the development of effective removal technology, respectively. When the novel saponification agent was used in the extraction and separation, magnesium utilization rate was more than 95%, and rare earths extraction rate above 99.5% has achieved. Therefore, the technology could replace ammonia-water to saponify the organic phase in rare earth extraction and separation process.

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