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--- wiki:pub:j.memsci.2017.05.009_cn [2018/01/11 14:08]
张伟明创建
+++ wiki:pub:j.memsci.2017.05.009_cn [2018/06/02 10:24] (当前版本)
张伟明
@@ 行 3: / 行 3: @@
 //J. Membr. Sci.// **2017**, 537, Pages 111--118 (1 September 2017)\\
 By Hui-Fang Xiao, Qing Chen, Huan Cheng, Xiu-Min Li, Wen-Meng Qin, Bao-Sheng Chen, Dong Xiao, Wei-Ming Zhang*\\
-[[http://www.sciencedirect.com/science/article/pii/S0376738817304696|j.memsci.2017.05.009]], {{ :wiki:pub:2017-j.memsci.2017.05.009-selective_removal_of_halides_from_spent_zinc_sulfate_electrolyte_by_diffusion_dialysis.pdf |fulltext}} {{ :wiki:pub:2017-j.memsci.2017.05.009-mmc1.xlsx |mmc1.xlsx}}
+[[http://www.sciencedirect.com/science/article/pii/S0376738817304696|j.memsci.2017.05.009]], {{ :wiki:pub:2017-j.memsci.2017.05.009-selective_removal_of_halides_from_spent_zinc_sulfate_electrolyte_by_diffusion_dialysis.pdf |fulltext}}, {{ :wiki:pub:2017-j.memsci.2017.05.009-mmc1.xlsx |mmc1.xlsx}}
 {{ :wiki:pub:toc_j.memsci.2017.05.009.png?400 |}}
-Zinc metal is mainly produced by a hydrometallurgical process, in which zinc electrolyte is recirculated, and impurities especially halides are accumulated then, which have dreadful impacts on the process and product. Until now numerous efforts have been made to remove halides from the electrolyte, but none of them are fully satisfying, and it is still a big issue for the industry. As a conventional membrane technology, diffusion dialysis (DD) is originally designed to recover free acid from acid-salt mixture by concentration gradient. In this work, we proposed a novel process to selectively remove these halide impurities from the spent zinc electrolyte by DD directly. Significant Cl- and F- permselectivities over HSO4- are observed in this process. The removal efficiencies are as high as 50–70% and 30–42% for chloride and fluoride, respectively, while the zinc loss is less than 1%. The flow intensity in the current work is much higher than that in conventional DD, which reduces the overall cost immensely. The mechanism of this selective mass transfer is also studied intensively to understand influence of flow intensity, charge number and hydrated radii of ions on the permselectivity. The results here are not confined to provide a superior method to remove halide impurities for the zinc industry, but also extend new applications and deepen understandings for the well-established DD process in selective ion separation. This capability is very likely to become a new growth point and future direction for the DD process besides acid/alkali recovery.
+金属锌主要是基于湿法冶金过程生产得到的。在此过程中硫酸锌电解液一直处于循环之中，因此原料中的各种杂质尤其是有害的卤素杂质逐渐累积，对金属锌的生产造成了严重影响。目前，研发人员已投入巨大努力来开发电解液中去除卤素杂质，特别是Cl-杂质的方法和工艺，然而不幸的是目前仍未找到一种完全令人满意的方法，因此对湿法冶锌过程来说仍然是一个挑战。扩散渗析（DD）技术是一种广泛使用的膜分离工艺，以浓差为驱动力来回收酸-盐混合物中的游离酸（或碱-盐混合物中的游离碱）。在本工作中，我们提出了一种基于DD技术的新工艺，用于从硫酸锌电解贫液中直接选择性去除卤素杂质。在该工艺过程中，我们发现相对于HSO4-离子，卤素离子如Cl- 和 F- 存在明显的跨膜渗透选择性，其Cl-去除率可达50-70%，F-去除率可达30-42%，而其总硫酸根损失率仅为约20%，而Zn2+的损失率更是小于1%。在我们的工艺中DD的操作流量强度远远高于用于酸回收的常规DD操作，大大减小了需要的膜面积，降低了设备成本。我们还仔细研究了该过程中离子的价态，水合半径大小及操作流量强度对膜的渗透选择的影响。本工作的结果不但给湿法冶金工艺提供了一个更好更经济的选择性除氯新方法，同时还拓展了DD的使用范围，从常规的酸/碱回收到选择性离子分离。这方面的新应用很有可能会成为DD工艺的新的增长点。

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