Utilizing multi-solid waste to prepare and characterize foam glass ceramics

Incorporating multi-solid wastes to prepare foam glass ceramics could effectively improve the utilization rate of solid wastes, beneficial to promoting the crystallization and bloating of samples. In this study, foam glass ceramics were prepared by a one-step sintering method using waste glass (WG), granite tailings (GT), and high titanium blast furnace slag (HTBFS). At the same time, the phase transformation, sintering, and physical properties of the samples were studied. The results showed that the sintering of foam glass ceramics consisted of three stages: sintering densification, bloating, and bubble coalescence. The low-temperature melting of WG created a favorable liquid phase environment to precipitate microcrystalline phases, such as wollastonite, diopside, and titanite. Adding HTBFS helped crystallize the sample, but increased the viscosity of the system, not favorable for bloating. When the HTBFS content was <15%, the physical properties of the samples were as follows: a bloating temperature of 980-1100 degrees C, crystallinity of 0%-38.9%, porosity of 48.5%-60.2%, water absorption of 0.6%-1.2%, compressive strength of 9.3-22.6 MPa, and thermal conductivity of 0.31-0.43 W/(mK). Consequently, the foam glass ceramics prepared in this study can be used in the field of structural insulation of buildings and has significant economic and social benefits.

Automated summary

Using multiple solid wastes to prepare foam glass ceramics can improve the utilization rate of solid wastes. This study used waste glass, granite tailings, and high titanium blast furnace slag to prepare foam glass ceramics, and studied their physical properties and sintering process.