通过化酸盐制备低盐排斥膜,以缩低度化溶液
Zhengyang Wu1,2,3, Zongyu Feng1,2,3, Longsheng Zhao1,2,3
1National Engineering Research Center for Rare Earth, Grirem Advanced Materials Co., Ltd., Beijing 100088, China.
Materials (Basel, Switzerland)
|June 27, 2025
概括
低盐排斥反透 (LSRRO) 有效地将稀释化溶液缩到120g/L. 与机械蒸汽再压缩相比,这种方法显著减少了80%的能源消耗,提供了一个高效的回收途径.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 环境科学 环境科学
背景情况:
- 从稀土沉中稀释的化 (MgCl2) 溶液很难使用传统方法回收.
- 传统的反透 (RO) 具有有限的MgCl2度容量,不足以有效回收.
研究的目的:
- 研究使用低盐排斥反透 (LSRRO) 来缩稀释的MgCl2溶液.
- 通过修改聚胺RO膜与化 (NaClO) 来制备和表征LSRRO膜.
主要方法:
- 聚胺RO膜在不同度,pH值和化时间下被NaClO处理.
- 准备好的LSRRO膜进行了MgCl2盐排斥和水流量测试.
- 采用多阶段的LSRRO,将20g/L的MgCl2溶液缩在5MPa.
主要成果:
- 聚胺膜的化化减少了盐的排斥和增加了水的流量.
- 最佳的LSRRO膜制备需要15g/L的NaClO在pH11下3小时,达到50.7%的MgCl2排斥.
- LSRRO将缩的MgCl2溶液缩到120g/L,明显超过了传统的RO限值.
- 具体能耗 (SEC) 为4.17千瓦时/立方米,与机械蒸汽再压缩 (MVR) 相比减少了80%.
结论:
- 通过化改性聚胺膜有效地作为LSRRO膜起作用.
- LSRRO提供了一种可行和节能的替代方案,用于集中稀释的MgCl2溶液进行回收.
- 这一过程为资源回收和减少稀土加工中的废物提供了一个有希望的途径.
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