Using waste electric porcelain to produce refractory bricks is a viable technology. However, these bricks currently have lower mechanical strength compared to those made from mineral raw materials. This study optimized the proportions and sintering process to develop high-strength refractory bricks from waste electric porcelain. The impact of physical phase, crystallinity, sintering temperature, and fly ash content on the bricks properties was examined. The research found that low crystallinity in waste electric porcelain leads to disorganized growth of mullite nano whiskers at high temperatures, reducing mechanical strength due to insufficient support structures and stress concentration zones. The addition of fly ash promotes the formation of uniformly dispersed mullite columns through non-uniform nucleation, significantly improving mechanical properties by creating a collective tetrahedral structure. Bricks with 20 wt% fly ash sintered at 1440 °C achieved a flexural strength of 77.3 MPa, a compressive strength of 156 MPa, and an apparent porosity of 10.89 %. High-temperature simulations indicate that these bricks exhibit good compressive strength and deformation resistance, with no adhesion observed. These high strength refractory bricks have promising potential for use in various high-temperature applications, including kiln linings, high-temperature flue, high-temperature support components and other industrial processes where durability and thermal stability are critical.
In this study, a low-cost foam ceramic was prepared by a high-temperature reconstruction method using gangue and waste electric porcelain as the main materials. The results showed that the sintering temperature, foaming agent (waste SiC slab) content and modifier Ca(OH) 2 had significant effects on the macrostructure, microstructure, crystalline phases and properties of the foam ceramics. With a sintering temperature of 1190 °C, waste SiC slab dosage of 3 % and the addition of the modifier Ca(OH) 2 , the obtained ceramics showed an earthy-yellow appearance, a compressive strength of 1.20 MPa, an apparent porosity of 64.00 %, a bulk density of 1.08 g/cm 3 , and a vertical expansion of 165 %. The increase of sintering temperature and foaming agent content improved the size of the pores. The SiO 2 protective layer of waste SiC slab was destroyed with the addition of Ca(OH) 2 , resulting in an increase in the porosity of foam ceramics by 24.9 %. Meanwhile, the introduction of calcium ions led to the fracture of Si-O bond and the reduction of liquid phase viscosity, thereby improving the uniformity of the pores. This study provides an innovative strategy and novel ideas for the value-added utilization of solid waste and the preparation of foam ceramics.
危险品化学品经营许可证（带存储）