Study on Synthesis of PAFS Based on Red Mud and Its Application inWastewater Treatment
ZHAO Heng, LI Wang*, NIU Zepeng, ZHU Xiaobo, XING Baolin College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China
College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Abstract: Red mud is a valuable and abundant secondary mineral resource. In this study, aluminum and iron are leached by sulfuric acid leaching method from Bayer red mud as raw material, and high-efficiency inorganic polymer flocculation was prepared by adding alkalizing agent. Polymeric aluminum ferric sulfate (PAFS) was polymerized and the effects of reaction conditions on the acid leaching process and PAFS treatment of kaolin wastewater were studied by single factor experiments, and compared with the effect of industrial grade polyaluminum chloride (PAC). The experimental results show that the calcination temperature of red mud is 900 ℃, the volume concentration of sulfuric acid is 45%, the mass ratio of solid solution of sulfuric acid to Bayer red mud is 9 mL/g, the acid solution temperature is 100 ℃, and the reaction time is 1 h. Under the optimized conditions, the dissolution rate of Al2O3 in Bayer red mud is 93.01%, and the dissolution rate of Fe2O3 is 89.54%. In the experiment on the effect of turbidity removal rate of kaolin wastewater, the dosage of PAFS and PAC, the concentration of kaolin wastewater, the pH value of wastewater, and the temperature have obvious effects on the turbidity removal rate of wastewater, and the purified water of PAFS is self-made. The performance of PAFS is superior to that of industrial grade PAC. The highest turbidity rate of PAC is 90%, while the highest turbidity rate of PAFS is over 96%.
赵恒, 李望, 牛泽鹏, 朱晓波, 邢宝林. 赤泥制备聚合硫酸铝铁及其处理废水的研究[J]. 材料导报, 2020, 34(21): 21038-21044.
ZHAO Heng, LI Wang, NIU Zepeng, ZHU Xiaobo, XING Baolin College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China. Study on Synthesis of PAFS Based on Red Mud and Its Application inWastewater Treatment. Materials Reports, 2020, 34(21): 21038-21044.
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2020, Vol. 34 
