Microstructure Characteristics and Possible Phase Evolution of the Coal Gangue-Steel Slag Ceramics Prepared by the Solid-State Reaction Methods

Abstract

Industrial wastes such as steel slag and coal gangue etc. were chosen as raw materials for preparing ceramic via the conventional solid-state reaction method. With steel slag and coal gangue mixed in various mass ratios, from 100% steel slag to 100% coal gangue at 10% intervals, microstructure and possible phase evolution of the coal gangue-steel slag ceramics were investigated using X-ray powder diffraction, scanning electron microscopy, mercury intrusion porosimetry and Archimedes boiling method. The experimental results suggest that the phase compositions of the as-prepared ceramics could be altered with the increased amount of coal gangue in the ceramics. The anorthite-diopside eutectic can be formed in the ceramics with the mass ratios of steel slag to coal gangue arranged from 8:2 to 2:8, which was responsible for the melting of the steel slag-coal gangue ceramics at relatively high temperature. Further investigations on the microstructure suggested that the addition of the proper amount of steel slag in ceramic compositions was conducive to the pore formation and further contributed to an increment in porosity.

Keywords

steel slag-coal gangue ceramics / synthesis / phase evolution / microstructure characteristics

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