Valuable rubidium extraction from potassium reduced seawater brine
Valuable rubidium extraction from potassium reduced seawater brine
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DOI：
10.1016/j.jclepro.2017.11.042
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发表时间：
2018-02
影响因子：
11.1
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中科院分区：
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从海水反渗透（SWRO）盐水中提取作为经济上有价值的金属的铷（Rb）是有益的。然而，SWRO卤水中的钾（K）阻碍Rb的提取。粉末形式的天然斜发沸石能够从SWRO盐水中选择性地去除K（朗缪尔最大吸附，Qmax（cal.） = 57.47 ± 0.09 mg/g）。一个集成的浸没式膜吸附反应器（SMSR）含有沸石粉实现65%的K从SWRO盐水去除。定期更换沸石分子筛，再加上膜反冲洗是有效的，在保持高的K去除效率和稳定的跨膜压力。小于5%的Rb损失发生沿着K吸附，建立了沸石在SWRO盐水中的高K选择性。载钾沸石作为缓释肥料的应用将有利于农业生产。在降低钾含量的反渗透盐水中，聚合物包封的铁氰化钾铜（KCuFC（PAN））吸附剂的Rb吸附效率从18%显著提高到83%。
Extraction of rubidium (Rb) which is an economically valuable metal from seawater reverse osmosis (SWRO) brine is beneficial. However, potassium (K) in SWRO brine hinders Rb extraction. Natural clinoptilolite zeolite in powder form was able to selectively remove K from SWRO brine (Langmuir maximum sorption, Qmax (cal.) = 57.47 ± 0.09 mg/g). An integrated submerged membrane sorption reactor (SMSR) containing zeolite powder achieved 65% K removal from SWRO brine. Periodic replacement of zeolite in SMSR, coupled with membrane backwashing was effective in maintaining a high K removal efficiency and a stable transmembrane pressure. Less than 5% Rb losses occurred along with K sorption, establishing the high K selectivity by zeolite in SWRO brine. Utilization of K loaded zeolite as a slow release fertilizer would be beneficial for agriculture. In SWRO brine with reduced K contents, the Rb sorption efficiency of polymer encapsulated potassium copper hexacyanoferrate (KCuFC(PAN)) sorbent, increased significantly from 18% to 83%.