Dissolution of metal elements in the circulating fluidized bed fly ash

doi:10.3969/j.issn.1000-1565.2022.01.006

Abstract

Abstract: In order to achieve the comprehensive utilization of fly ash solid waste in recirculating fluidized bed and explore the alternative resources of bauxite, the dissolution of metal elements including aluminum, iron and titanium in circulating fluidized bed fly ash was studied by microwave digestion, sub-molten salt method and direct acid dissolution. Effects of different digestion conditions on the dissolution rate of various elements in fly ash were investigate and compared. The results showed that fly ash sample was digested by microwave method and the dissolution rate of aluminum element in fly ash was higher than 90% using 20% NaOH solution or HNO₃-HCl-HF mixed acid as digestion solvent. The dissolution rates of titanium and iron were both less than 50% under alkaline conditions. Fly ash is difficult to dissolve by the sub molten salt method and acid method. But aluminum and iron were dissolved by acid leaching using the sub molten salt method. It provides a theoretical reference for the comprehensive utilization of circulating fluidized bed fly ash.

Key words: fly ash, aluminium, titanium, iron, sub-molten salt method

CLC Number:

TF82

LIU Yanling, REN Yingqi. Dissolution of metal elements in the circulating fluidized bed fly ash[J]. Journal of Hebei University(Natural Science Edition), 2022, 42(1): 38-43.

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