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对用铅为载体从铀精矿中提取镭的可能性进行了研究,提出了一套新的提镭工艺流程。 用40％硝酸从铀矿石中浸出铀和镭,在浸出液中加入硝酸铅和硫酸,使镭以硫酸铅-镭形式沉淀,用EDTA溶液将沉淀溶解,调节酸度至pH=4,让硫酸钡-镭选择沉淀。将后者的EDTA溶解液调节酸度后,通过装有SA110×8阳离子交换树脂的柱子进行色层分离。 考察了NH_4~+浓度对离子交换色层分离钡、镭的影响,选定了较好的操作条件。连续进行两次离子交换色层分离,得到含镭210—245毫克/升、钡0.12—0.22毫克/升的硝酸镭溶液。 提出的流程具有工序少、生产周期短、试剂耗量少、回收率高和产品纯度高等优点。
The possibility of using lead as carrier to extract radium from uranium concentrate was studied, and a new set of radium extraction process was proposed. Leaching uranium and radium from uranium ore with 40% nitric acid, adding lead nitrate and sulfuric acid to the leaching solution, precipitating radium with lead sulfate-radium, dissolving the precipitate with EDTA solution, adjusting acidity to pH = 4, letting barium sulfate- Radium choose precipitation. After the latter EDTA solution was adjusted to acidity, chromatography was performed on a column packed with SA110 × 8 cation exchange resin. The effect of NH_4 ~ + concentration on the separation of barium and radium from ion exchange chromatography was investigated. The better operating conditions were selected. The ion exchange chromatography was separated twice in succession to obtain radium nitrate solution containing 210-245 mg / l of radium and 0.12-0.22 mg / l of barium. The proposed process has the advantages of less processes, short production cycle, less reagent consumption, high recovery rate and high product purity.