摘要：为了实现对粉煤灰提取氧化铝残渣的利用,对粉煤灰提铝残渣的颗粒特性及处理含Cr³⁺酸性溶液的效果与机理进行研究,通过对该粉煤灰提铝残渣进行化学成分、物相、比表面积、形貌等分析,对残渣的颗粒特性进行分析研究。结果表明:该残渣化学成分主要为Ca(OH)₂、Ca₂SiO₄,结构疏松多孔,具有较大的比表面积,并且具有强碱性;基于残渣的特点,将其用于处理含重金属Cr³⁺的酸性溶液,用0.12 g的残渣可使100 m L Cr₂(SO₄)₃质量分数为1.598×10^-3的酸性溶液中Cr³⁺去除率达到99%,溶液p H由2.54增大为6.01;处理后的Cr³⁺几乎完全以Cr₂O₃形式沉淀。

关键词：粉煤灰提铝残渣；颗粒特性；废液处理

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