Novel process for high value utilization of high-alumina fly ash: valuable metals recovery and mesoporous silica in situ preparation.

ABSTRACT: Extraction of valuable metals besides silica from high-alumina fly ash is one of the most important high-value utilization pathways. However, it is difficult to realize high-efficiency extraction due to the stable structure e.g. of quartz and mullite. In this paper, mineral phase transformation for valuable metal recovery and mesoporous silica in situ preparation from fly ash by a selective acid leaching method was proposed. The mineral phase transformation, dissolution behavior of each metal, and pore structure of fly ash derived mesoporous silica were systematically investigated. The results show that the co-activation of fly ash by Na₂CO₃-K₂CO₃ formed the phases of kalsilite and (Na, K)AlSiO₄. During the acid leaching

SUBMITTER: Gao JM 

PROVIDER: S-EPMC10772861 | biostudies-literature | 2024 Jan

REPOSITORIES: biostudies-literature