Geometry optimization of an electrochemical reactor for bleaching kaolin

IF 1.1 4区 地球科学 Q4 CHEMISTRY, PHYSICAL Clay Minerals Pub Date : 2022-09-01 DOI:10.1180/clm.2022.36
J. A. Cobos-Murcia, E. Hernández-Aguilar, A. Trujillo-Estrada, Grisell Gallegos-Ortega, V. Reyes-Cruz
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Abstract

Abstract High-whiteness kaolinite mining reserves are scarce. In some locations, it is necessary to remove material to access them (adding to the cost). Therefore, processes have been developed to eliminate contaminants, such as iron, and provide alternatives to the used contaminated materials that, after being treated, meet quality criteria. In our previous research, we developed an electrochemical process for kaolin whitening at the laboratory level and bench scale, demonstrating the reaction mechanisms that occur during the removal of iron from kaolin. However, the geometry used at the laboratory level does not present the most suitable position for the electrodes. Therefore, in the present study, we focused on the geometry and the function of the electrodes. This is necessary during the escalation process to reach the pilot-scale level. The study was carried out using computer-aided engineering in the COMSOL Multiphysics computer program and by analysing the distribution of the electric potential and the electric current of the geometries considered while performing the scaling. The results indicated that the change in the anode position from perpendicular to parallel to the discs improved the distribution of electric current density on the cathode surface and so increased the elimination of iron through electrochemical deposition. Similarly, to reduce the amount of material used in the construction of the reactor, the anode-size effect was analysed, revealing that relatively small anodes improved the distribution of electric current density over the entire surface of the electrode and not only at the edges.
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高岭土漂白电化学反应器的几何优化
摘要高白度高岭石开采储量有限。在某些位置,需要移除材料才能访问它们(增加了成本)。因此,已经开发出消除污染物(如铁)的工艺,并提供经处理后符合质量标准的使用污染材料的替代品。在我们之前的研究中,我们在实验室和实验规模上开发了高岭土增白的电化学过程,展示了高岭土中铁的去除过程中发生的反应机制。然而,在实验室水平上使用的几何结构并没有给出最合适的电极位置。因此,在本研究中,我们主要关注电极的几何形状和功能。在升级过程中,这是达到试点规模水平所必需的。该研究使用COMSOL Multiphysics计算机程序中的计算机辅助工程,并通过分析在执行缩放时所考虑的几何形状的电势和电流分布来进行。结果表明,阳极位置由垂直于电极盘向平行于电极盘的方向变化,改善了阴极表面电流密度的分布,从而提高了电化学沉积对铁的去除率。同样,为了减少反应器结构中所用材料的数量,分析了阳极尺寸效应,揭示了相对较小的阳极改善了电流密度在整个电极表面的分布,而不仅仅是在边缘。
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来源期刊
Clay Minerals
Clay Minerals 地学-矿物学
CiteScore
3.00
自引率
20.00%
发文量
25
审稿时长
6 months
期刊介绍: Clay Minerals is an international journal of mineral sciences, published four times a year, including research papers about clays, clay minerals and related materials, natural or synthetic. The journal includes papers on Earth processes soil science, geology/mineralogy, chemistry/material science, colloid/surface science, applied science and technology and health/ environment topics. The journal has an international editorial board with members from fifteen countries.
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