由煤系高岭土制备硫酸铝及其絮凝性能

Preparation of aluminum sulfates from coal-bearing Kaolinite and their flocculation performance

以内蒙古煤系高岭土为原料,通过酸溶法用浓硫酸在200℃反应制备了硫酸铝,进而制备聚合硫酸铝(SPAS),并采用X射线衍射、热重分析和红外光谱进行表征。结果表明,该方法制备的硫酸铝为Al_2(SO_4)_3·18H_2O。S-PAS的絮凝效果优于市售聚合硫酸铝(O-PAS),其浓度10 m L/L时,浊度去除率最高,达90%。

The aluminum sulfate was prepared from Inner Mongolia coal-bearing Kaolinite by the direct extraction of aluminum using concentrated sulfuric acid at the temperature of 200 ℃.Meanwhile polymerized aluminum sulfate was synthesized.The obtained samples were characterized by X-ray diffraction （XRD）,Thermogravimetric analysis （TGA） and Fourier transform infrared spectroscopy （FTIR）.The results showed that as-prepared aluminum sulfate has a formula of Al2（SO4）3·18H2O.The flocculation test showed that the flocculation performance of polymerized aluminum sulfate （S-PAS） is better than commercially available polymerized aluminum sulfate （O-PAS）.And when the concentration of PAS is 10 mL/L,the PAS exhibits the best flocculation performance for the domestic sewage with the highest turbidity removal rate of 90%.