Key Technology of Industrial Silica-Rich Slag Recovery: Green Large-Scale Low-Temperature Production of Mullite Whiskers

Abstract

Catalyzed by MoO3, mullite whiskers were synthesized through a molten salt method. This study comprehensively explored the impact of reaction temperature, MoO3 mass fraction, and calcination temperature on the morphology of mullite whiskers. Employing analytical techniques such as XRD and SEM, the phase composition and morphology of the samples were meticulously scrutinized. The results unveiled that at a MoO3 mass fraction of 7% (molar fraction) and a calcination temperature of 800°C, mullite whiskers demonstrated a heightened level of purity. Building on these observations, the study delved into the mechanistic underpinnings of MoO3 as a catalyst in mullite whisker synthesis. Concurrently, endeavors were made to industrially produce mullite whiskers utilizing discarded silicon-aluminum gel slag, with the intent of accumulating pivotal insights for the large-scale generation of mullite whiskers.

Keywords: Mullite whisker, MoO3, Low temperature growing, Solid waste recycling, Large-scale preparation