关键词: 废瓷, 牡蛎壳, 钙长石, 青釉, 还原气氛, 黏度

Abstract: Porcelain waste and oyster shell are major solid waste pollutants in China's coastal areas. How to achieve high-value utilization of porcelain waste and oyster shell is an urgent problem to be solved. In this study, the compositional characteristics of different types of porcelain waste and oyster shell were analyzed. Then based on single-component daily-used porcelain waste, the effects of the addition of multi-component porcelain waste and reducing atmosphere on the melting characteristics, optical properties, and hardness of glaze were explored. The phase, morphology, and high-temperature behavior of glaze were analyzed by XRD, SEM, EDS, and thermal analysis techniques. The results show that primary enstatite in magnesia porcelain waste acts as a flux, which is beneficial to reduce the melting temperature of glaze. The sphere temperature, hemisphere temperature, and flow temperature of glazes decrease from 1 248, 1 255 and 1 268 ℃ to 1 213, 1 222 and 1 231 ℃, respectively. Bone china porcelain waste introduces P₂O₅, which exerts a “network-mending” effect within the silicate network, and broadens the temperature range for glaze formation. Moreover, the addition of reducing agent leads to the formation of blue Fe²⁺, so that the glaze color changes from yellow to blue-green. At the same time, as a glass network modifier, Fe²⁺ reduces the viscosity of the glaze melt, promotes the diffusion mass transfer of glaze and the crystallization of anorthite, resulting in a decrease in the gloss and an increase in the hardness of glaze surface.

Key words: porcelain waste, oyster shell, anorthite, celadon glaze, reducing atmosphere, viscosity