Abstract： To achieve full utilization of the fly ash residue after extracting aluminium oxide, the particle properties of the residue and its effect and mechanism of treating acidic solution containing Cr³⁺ were studied. The fly ash residue was characterized by chemical composition analysis, XRD, specific surface area, and SEM. The results show that the residue is mainly consisted of Ca(OH)₂ and Ca₂SiO₄ with porous structure of large specific surface area and strong alkalinity. Based on characteristics of the fly ash residue, the acidic solution containing heavy metal ions Cr³⁺ is treated effectively by the fly ash residue. The removal rate of Cr³⁺ in 100 mL acid solution with mass fraction of Cr₂(SO₄)₃ of 1.598×10^-3 can reach 99% by 0.12 g residue. The pH of the solution increases from 2.54 to 6.01. Cr³⁺almost completely precipitates in the form of Cr₂O₃.

Keywords: fly ash residue after extracting aluminium oxide; particle characteristic; treatment of waste liquide

中图分类号：TB44           文献标志码：A

文章编号：1008-5548（2014）06-0070-04

DOI:10.13732/j.issn.1008-5548.2014.06.017

收稿日期：2014-05-29， 修回日期：2014-06-26，在线出版时间：2014-12-22。

第一作者简介：李敏（1992—），女，本科生，研究方向为材料科学与工程。 E-mail：1461060286@qq.com。

通信作者简介：杜高翔（1976—），男，副教授，硕士生导师，研究方向为新型矿物材料、矿业固体废弃物的深度回收与利用以及新型环境材料。电话：010-82322982，E-mail: dgx@cugb.edu.cn。