The nitric acid decomposition of an eudialyte concentrate by sorption conversion is studied. This method is based on the interaction of the concentrate with a low concentrated solution of HNO₃ in the presence of sulfonic cation-exchange resin. During sorption conversion, the target metals are predominantly sorbed by a sorbent, which is easily separated from the solution and silica gel-containing residues. When the solution containing 2% HNO₃ is used, the extraction of rare elements is comparable and the acid consumption is 6–8 times lower than that in the case of the traditional decomposition of an eudialyte concentrate using concentrated nitric acid. The procedure simultaneously produces a nonradioactive silica gel product appropriate for the production of qualitative building materials. The possibility of the further increase in the degree of extraction of rare elements is discussed. A route for the processing of the sorbent saturated with rare metals is proposed to produces salt concentrates of these elements.

中文翻译：

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吸附转化法用硝酸分解富余尿酸盐

研究了通过吸附转化法制得的常绿透析浓缩液的硝酸分解。该方法基于在磺酸阳离子交换树脂存在下浓缩物与低浓度的HNO ₃溶液的相互作用。在吸附转化过程中，目标金属主要被吸附剂吸附，该吸附剂很容易与溶液和含硅胶残留物分离。当溶液中含有2％HNO _3时如果使用这种方法，则稀有元素的提取是可比的，并且酸消耗量是使用浓硝酸进行传统的富余液浓缩物传统分解的情况下的6-8倍。该程序同时生产了适合生产定性建筑材料的非放射性硅胶产品。讨论了进一步增加稀有元素提取程度的可能性。提出了一种处理用稀有金属饱和的吸附剂的方法，以生产这些元素的盐精矿。