Synthesis of Sialon-Based Eco-Materials from Gold Mineral Tailings

Sialon-based eco-materials were synthesized by using the gold mineral tailings that containing abundant Si and Al elements as the major raw material with minor additives through the carbothermal reduction nitridation route. This study realized the conversion of eco-materials from solid waste, gold mineral tailings. The effects of sintering temperature, holding time and x value during carbothermal reduction nitridation process on the phase composition and microstructure of as-fabricated Sialon-based materials were explored. The XRD results indicated that when sintering temperature is 1550°C, holding time is 6h, and x value is 1.0, Ca-α-Sialon/SiC/Fe3Si composites was successfully synthesized. The relative content Subscript textof each phase in the products is I(α-Sialon): I(SiC): I(Fe3Si)=82:10:8. The SEM images showed the densificated microstructure and uniform grains with the long column shape.