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• W4308483698 startingPage "122545" @default.
• W4308483698 abstract "• High-efficiency leaching of valuable metals from CFB fly ash could be achieved. • The combined hydrochloric acid-sulfuric acid leaching process was proposed. • PAFCS coagulant was prepared from two-stage acid leaching liquors of fly ash. • The PAFCS exhibited excellent floc performance in comparison to PAC and PAFC. Preparation of inorganic polymer coagulants from circulating fluidized bed (CFB) fly ash is one of the most significant value-added and environment-friendly approaches. Nevertheless, CFB fly ash presents relatively low solubility in acidic systems, which limits its utilization efficiency. In this paper, enhanced metal leaching from CFB fly ash using combined HCl-H 2 SO 4 leaching process for polymeric aluminum ferric chloride sulfate (PAFCS) preparation was proposed. PAFCS with the different molar ratios of Al 3+ /SO 4 2– and Al 3+ /Fe 3+ were prepared from as-obtained leaching liquors and characterized by SEM, XRD, FTIR, and coagulation experiments. The leaching efficiencies of Al and Fe in CFB fly ash were up to 96.75% and 97.64% by combined HCl-H 2 SO 4 leaching process. The optimal molar ratios of Al 3+ /SO 4 2– and Al 3+ /Fe 3+ for the turbidity and UV 254 removal were 10:1 and 10:1, respectively, due to the three-dimensional chain-net structure and the highest [Al+Fe] b content. When applied to biochemical effluent of coking wastewater treatment, PAFCS exhibited excellent removal performance on both humic acid-like and fulvic acid-like matters. The resultant flocs of PAFCS presented the largest recovery factor (R f =0.37) and strength factor (S f =0.79) in contrast with PAC and PAFC. This work provides a novel and high-efficient Al and Fe leaching strategy from CFB fly ash to prepare Al-Fe coagulant." @default.
• W4308483698 created "2022-11-12" @default.
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• W4308483698 date "2023-02-01" @default.
• W4308483698 modified "2023-09-25" @default.
• W4308483698 title "High-efficiency leaching of Al and Fe from fly ash for preparation of polymeric aluminum ferric chloride sulfate coagulant for wastewater treatment" @default.
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• W4308483698 doi "https://doi.org/10.1016/j.seppur.2022.122545" @default.
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