Phase Composition Evolution and Properties of Proto-Enstatite-Base Microcrystalline Ceramics Prepared by Asbestos Tailings

Abstract

Abstract: The proto-enstatite-base microcrystalline ceramics were prepared by one-time method, taking asbestos tailings and quartz sand tailings as main raw materials. The effects of different m(SiO₂)/m(MgO)mass ratios and sintering temperatures on the crystal phase composition, microstructure and physical-chemical properties of microcrystalline ceramic materials were investigated by X-ray diffraction, field emission scanning electron microscopy and other testing methods. The results show that with the increase of m(SiO₂)/m(MgO) mass ratio and sintering temperature, the content of enstatite formed by the reaction of SiO₂ and forsterite in microcrystalline ceramics increases.After sintering at 1 240~1 280 ℃, enstatite is transformed into its high-temperature stable form, proto-enstatite, and the quartz phase that does not participate in the reaction gradually transforms into cristobalite phase. When the m(SiO₂)/m(MgO) mass ratio is 1.43~3.56 and the sintering temperature is 1 280 ℃, the water absorption, bulk density, linear shrinkage and flexural strength are 0.67%~0.15%, 2.74~2.16 g·cm^-3, 10.29%~1.37%, 107.51~40.35 MPa respectively, and the acid and alkali corrosion amount is less than 1.36% and 0.13%, respectively. Each performance index is superior to the standard of Class Ib low water absorption stoneware brick in Ceramic tiles (GB/T 4100—2015).

Key words: asbestos tailing, microcrystalline ceramics, m(SiO₂)/m(MgO) mass ratio, proto-enstatite, forsterite, quartz sand tailing

CLC Number:

X754

LI Xiang, SUN Hongjuan, PENG Tongjiang, CHEN Tao, WANG Can. Phase Composition Evolution and Properties of Proto-Enstatite-Base Microcrystalline Ceramics Prepared by Asbestos Tailings[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(6): 2172-2181.

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