This study investigated the feasibility of preparing building ceramic tiles using solid waste with high calcium contents,with wollastonite serving as the primary raw material.The effects of various wollastonite tailing contents and firing temperatures on the mechanical properties,phase composition,and microstructures of the green body were investigated through TG-DTA,XRD,SEM and mechanical property testing methods.The result shows ceramic tile samples with a water absorption rate of 0.45％and a flexural strength of 53.9 MPa can be prepared with 35 wt％of wollastonite tailings at 1150 ℃.Further research on the sintering process of the green body reveals that dehydration and decomposition of kaolin and calcite occurred first when the temperature was below 900 ℃,while the wollastonite was transformed from the 1A type to the 2M type and reacted with the silicoaluminate in the green body to form calcium feldspar,ultimately achieveing densification of the green body under the action of a low viscosity liquid phase.
关键词
高钙固废/硅灰石尾矿/瓷质砖/力学性能/烧结过程
Key words
High-calcium solid waste/Wollastonite tailings/Ceramic tiles/Mechanical properties/Sintering process
维普
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