Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China.
Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
Int J Environ Res Public Health. 2022 Jul 30;19(15):9364. doi: 10.3390/ijerph19159364.
A microtubule ultrafiltration reactor (MUFR), with an organophosphorus system containing a sewage section with buffer liquid acetic acid and an enrichment section with aqua fortis liquid and organophosphorus dissolved in fuel oil, has been studied for praseodymium(III) migration. Many factors of praseodymium(III) migration using MUFR need to be explored, including hydrogen ion molarity (or pH), cinit of praseodymium(III), the different ionic strengths of rare-earth mine sewage, the volume ratio of organophosphorus fuel oil and aqua fortis liquid (O/A), aqua fortis' molarity, organophosphorus' molarity, and the effects of different acid liquids in the enrichment section on praseodymium(III) migration with MUFR. The virtues of MUFR compared to conventional migration were explored. The effects of the hydrodynamic properties (stability and flow velocity) and UF system parameters (internal diameter of the microtubule, tubule shell thickness, void ratio), etc., on the mass migration performance of the MUFR process for praseodymium(III) migration were also studied. The experimental results show that the best migration prerequisites of praseodymium(III) were obtained as follows: an aqua fortis molarity of 4.00 mol/L, an organophosphorus molarity of 0.200 mol/L, an O/A of 0.6 in the enrichment section, and a pH value of 4.80 in the sewage section. The ionic strength of rare-earth mine sewage had no obvious effect on praseodymium(III) migration. When the cinit of praseodymium(III) molarity was 1.58 × 10 mol/L, the migration percentage of praseodymium(III) reached 95.2% in 160 min.
微孔过滤反应（MUFR）采用含有含磷体系的方法，体系包括含有缓冲液乙酸的污水段和含有发烟硝酸和溶解在燃料油中的有机磷的浓缩段，用于研究镨（III）的迁移。MUFR 中需要研究镨（III）迁移的许多因素，包括氢离子摩尔浓度（或 pH 值）、镨（III）的初始浓度、稀土矿污水的不同离子强度、有机磷燃料油和发烟硝酸液体的体积比（O/A）、发烟硝酸的摩尔浓度、有机磷的摩尔浓度，以及浓缩段中不同酸液对 MUFR 中镨（III）迁移的影响。还探讨了 MUFR 与传统迁移相比的优点。研究了水动力特性（稳定性和流速）和 UF 系统参数（微管内径、管壳厚度、空隙率）等对 MUFR 过程镨（III）迁移的质量迁移性能的影响。实验结果表明，镨（III）最佳迁移条件如下：浓缩段发烟硝酸摩尔浓度为 4.00mol/L，有机磷摩尔浓度为 0.200mol/L，O/A 为 0.6，污水段 pH 值为 4.80。稀土矿污水的离子强度对镨（III）迁移没有明显影响。当镨（III）初始浓度为 1.58×10 mol/L 时，镨（III）在 160min 内的迁移率达到 95.2%。
