Nowadays, solving the problem of rational, integrated use of the mined raw materials, the transition to waste-free technologies for its processing is a crucial task. The sulfuric acid technology used for the processing of apatite concentrates on a large industrial scale does not provide the associated extraction of accompanying valuable components—rare earth metals (REM). During apatite concentrate processing, rare-earth metals are affected by the technology-related dispersion, being distributed between the insoluble leaching residue and phosphoric acid solution sent to the production of fertilizers. The necessity of a cost-effective method development for the extraction of rare earth metals is quite obvious already in connection with the indicated significance of the problem. Phosphoric acid solutions that simulate the composition of industrial phosphoric acid solutions of the following composition 4.5 mol/L H₃PO₄, 0.19 mol/L H₂SO₄ and 0.10–0.12% REM were selected as the object of research. The extraction of rare earth metals was carried out using polymers containing a fixed layer of an extractant—di-2-ethylhexylphosphoric acid (D2EHPA). Fixed layer was obtained by impregnation-saturation (solvent-impregnated resin (SIR)) or by the introduction of an extractant at the stage of polymer matrix synthesis (extractant-resin extraction (ERE)). The work determined the thermodynamic and technological characteristics of the solid-phase extraction of rare earth elements from phosphoric acid solutions with polymers impregnated with D2EHPA and containing a rigidly fixed extractant in a styrene-divinylbenzene resin matrix. The possibility of effective multiple use of polymeric resins containing D2EHPA, regenerated with a solution of 1 mol/L sodium citrate, was revealed.

中文翻译：

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固相萃取剂从磷酸溶液中萃取稀土金属

如今，解决开采原料的合理、综合利用问题，向无废料加工技术过渡是一项至关重要的任务。用于大规模工业规模加工磷灰石浓缩物的硫酸技术不提供伴随有价值成分稀土金属 (REM) 的相关提取。在磷灰石精矿加工过程中，稀土金属受技术相关分散的影响，分布在不溶性浸出渣和送往化肥生产的磷酸溶液之间。开发用于提取稀土金属的具有成本效益的方法的必要性已经与所指出的问题的重要性相联系是非常明显的。₃ PO ₄ , 0.19 mol/LH ₂ SO ₄0.10-0.12% REM 被选为研究对象。使用含有固定层萃取剂二-2-乙基己基磷酸 (D2EHPA) 的聚合物进行稀土金属的萃取。通过浸渍-饱和（溶剂浸渍树脂（SIR））或通过在聚合物基质合成阶段引入萃取剂（萃取剂-树脂萃取（ERE））获得固定层。这项工作确定了从磷酸溶液中固相萃取稀土元素的热力学和技术特性，聚合物浸渍了 D2EHPA，并在苯乙烯-二乙烯基苯树脂基质中含有刚性固定的萃取剂。揭示了有效多次使用含有 D2EHPA 的聚合物树脂的可能性，用 1 mol/L 柠檬酸钠溶液再生。