Effects of Sintering Temperature and Mechanically Activated Time on Ceramic Tiles Preparation with Ceramic Solid Waste

Abstract

Abstract: The production, using and disposal process of ceramics will produce a large amount of solid waste. Most of these ceramic solid wastes can only be disposed of open piles or landfills, with a low degree of resource utilization. In this paper, ceramic solid waste was mechanically activated with triethanolamine and millimeter zirconia balls as main raw material. The effects of different mechanical activation times and sintering temperatures on sintering performance of waste ceramic powder were investigated. The experimental results show that the most suitable mechanical activation time is 6 h, which can reduce the medium particle size D₅₀ of waste porcelain powder from 4.329 μm to 0.141 μm. The mechanical activation can break the ordered Si—O tetrahedral structure of waste porcelain powder, deepen its amorphization, and then improve the sintering activity of powder. The increase of sintering temperature not only increases the generation of liquid phase to fill inter-particle pores and improves densities of samples, but also promotes the generation of tremolite, which improves the physical properties of samples. The most suitable sintering system is sintering temperature 950 ℃ and holding time 0.5 h. The sintered sample has a flexural strength of 51.63 MPa, a water absorption rate of 0.386%, and a bulk density of 2.342 g/cm³, which can meet the BIa class standard (average flexural strength ≥35 MPa, water absorption ≤0.5%) in Ceramic Tiles (GB 4100—2016). This paper provides a new method of ‘from waste to resource’, which achieves the effective recycling of waste ceramics.

Key words: ceramic solid waste, mechanical activation, medium particle size, diopside, ceramic tile

CLC Number:

TQ174.76

NING Gaopeng, ZHOU Zhengyuan, XIA Guanghua, WU Wenxing, CAO Tianyi, CHEN Yushan. Effects of Sintering Temperature and Mechanically Activated Time on Ceramic Tiles Preparation with Ceramic Solid Waste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(8): 3026-3033.

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