Processing of coal fly ash magnetic spheres for clay water flocculation

Q1 Earth and Planetary Sciences

International Journal of Mineral Processing Pub Date : 2017-12-10 DOI:10.1016/j.minpro.2017.11.006

Jianjun Li , Jinbo Zhu , Shangyuan Qiao , Zhenwei Yu , Xiaolin Wang , Yin Liu , Xiangrui Meng

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引用次数: 17

Abstract

The application of coal fly ash magnetic spheres (MSs) in water treatment is limited due to their complex mineral compositions, low magnetism, and large diameters. In this study, MSs were carefully ball milled and magnetically separated to improve their related properties. After the processing, the resultant magnetic ball-milled MSs (MBMSs) show a substantial change in composition, magnetism, and surface property in addition to a decrease in diameter. Compared with those of the original MSs, the Fe percentage, magnetism, and specific surface area of MBMSs are increased by 25.87%, 54.60%, and 810%, respectively. Dispersive spectrometer mapping investigation shows segregated high- and low-Fe areas with different structures in MS. These different structures enable purification. Highly turbid clay water flocculation experiments using MSs as flocculants indicate that MBMSs can cause fast flocculation whereas the compared samples exert less or slight flocculation effect. Zeta potential investigation suggests that the different flocculation effects are due to the change in the point of zero charge (pH_PZC). The pH_PZC increases from 3.91 for the original MS to 4.96 for MBMS. The reduction in the diameter, as well as the increase in magnetism, surface area, and pH_PZC, makes MSs applicable to water treatment.

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粉煤灰磁性球对粘土水絮凝的处理

粉煤灰磁性球由于其矿物成分复杂、磁性低、直径大等缺点，限制了其在水处理中的应用。在本研究中，对MSs进行了精心的球磨和磁分离，以改善其相关性能。经过处理后，所得到的磁球磨MBMSs (mbms)除了直径减小外，在成分、磁性和表面性能方面都发生了实质性的变化。与原MBMSs相比，MBMSs的铁含量、磁性和比表面积分别提高了25.87%、54.60%和810%。色散谱仪测图显示ms中不同结构的高铁区和低铁区，这些不同的结构使纯化成为可能。用MBMSs作为絮凝剂对高浑浊粘土水进行絮凝实验表明，MBMSs絮凝速度快，而比较样品的絮凝效果较差或较弱。Zeta电位研究表明，絮凝效果的不同是由于零电荷点(pHPZC)的变化。pHPZC从原始MS的3.91增加到MBMS的4.96。直径的减小以及磁性、表面积和pHPZC的增加使MSs适用于水处理。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Mineral Processing 工程技术-工程：化工

CiteScore

3.02

自引率

0.00%

发文量

审稿时长

11.1 months

期刊介绍： International Journal of Mineral Processing has been discontinued as of the end of 2017, due to the merger with Minerals Engineering. The International Journal of Mineral Processing covers aspects of the processing of mineral resources such as: Metallic and non-metallic ores, coals, and secondary resources. Topics dealt with include: Geometallurgy, comminution, sizing, classification (in air and water), gravity concentration, flotation, electric and magnetic separation, thickening, filtering, drying, and (bio)hydrometallurgy (when applied to low-grade raw materials), control and automation, waste treatment and disposal. In addition to research papers, the journal publishes review articles, technical notes, and letters to the editor..