Properties Change of All Solid Waste Coal Gasification Slag Glass-Ceramics Prepared by One Step Direct Sintering

Abstract

Abstract: All solid waste coal gasification slag glass-ceramics were prepared by one-step direct sintering with coal gasification coarse slag as the raw material. The effects of sintering temperature and time on crystal phase evolution, mechanical and physical properties and microstructure of all solid waste coal gasification slag glass-ceramics were studied. The results show that the coal gasification slag has strong crystallization tendency, and anorthite is the main crystal phase. As the sintering temperature increases in the range of 800~1 150 ℃, the crystallinity of glass-ceramics increases firstly and then decreases. Flake structure appears in the glass-ceramics and the physical and chemical properties decrease when the sintering temperature is too high. In the range of 1 110~1 120 ℃, the glass-ceramics are fine and densely distributed, and show good physical properties. However, the sintering time has little effect on the properties of samples. When the sintering temperature is 1 120 ℃ and sintering time is 2 h, Vickers hardness of glass-ceramics is 6.92 GPa, flexural strength is 38.29 MPa, compressive strength is 432.72 MPa, bulk density is 2.618 g/cm³, water absorption is 0.21%, and acid and alkali resistance are 3.13% and 0.92%, respectively. Excellent mechanical properties are achieved, however, there is still room for improvement in water absorption and chemical stability.

Key words: coal based solid waste, coal gasification slag, one step direct sintering, glass-ceramics, anorthite phase, sintering temparature

CLC Number:

TD98

LI Yu, ZHANG Xian, LIU Zhiping, WANG Yunfei, ZHANG Tiezhu, ZHANG Yuxuan, OUYANG Shunli. Properties Change of All Solid Waste Coal Gasification Slag Glass-Ceramics Prepared by One Step Direct Sintering[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(3): 978-988.

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