Materlals and Sustainable Development:Environment-Friendly Materials and Materials for Environmental Remediation |
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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
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College of Chemistry and Chemical Engineering, Henan Polytechnic University, Jiaozuo 454000, China |
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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%.
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Published: 17 November 2020
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Fund:This work was financially supported by the National Natural Science Foundation of China (51904097, 51804103), the Training Program for Young Backbone Teachers in Colleges and Universities of Henan Province (2019GGJS056), Open Foundation of State Environmental Protection Key Laboratory of Mineral Metallurgical Resources Utilization and Pollution Control (HB201905). |
About author:: Heng Zhao, a graduate student, is currently studying at the College of Chemistry and Chemical Engineering, Henan Polytechnic University. His research focuses on the comprehensive utilization of solid waste. Wang Li is an associate professor and postgraduate tutor at Henan Polytechnic University. She is mainly engaged in the comprehensive utilization of solid waste, the efficient extraction of rare metals, mineral proces-sing, and wastewater resource treatment. In the past five years, she has won one first prize for scientific and technological progress at the provincial and ministerial le-vels, presided over one project of the National Natural Science Foundation, one project of the Henan Provincial Science and Technology Department, and one key project of the Henan Provincial Education Department. She participated in three national-level projects as a major technician, authorized 12 invention patents, and published more than 30 academic papers, including 9 SCI papers. |
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