Study on the distribution characteristics and solidification mechanism of heavy metal ions in polycrystalline slag glass-ceramics
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This study established a resource utilization technology system for the blast furnace slag resource recovery (BFS). Usingmanganese-bearing blast furnace slag (MBFS) from Baotou Bayan Obo ore as the primary raw material, glass-ceramics weresuccessfully prepared through the introduction of Cr2O3 and Fe2O3 composite nucleating agents. The research systematicallyelucidates the occurrence patterns and immobilization mechanisms of polymetallic elements (Cr, Mn, Pb) in glass-ceramics,providing theoretical support for high-value utilization of metallurgical solid waste. Experimental results demonstrated thatthe glass-ceramics exhibit a characteristic multi-phase composite structure: the augite phase as the primary crystalline phasegrows attached to spinel, while the wollastonite phase interweaves with residual glass matrix. Heavy metal distribution analysisrevealed that Cr and Mn were predominantly distributed within the spinel phase, whereas Pb showed enrichment in augite,wollastonite, and glass phases. Notably, elevated PbO content tends to induce localized lead-ion enrichment zones withinthe glass phase. The glass-ceramics achieved effective immobilization of multiple heavy metals through mechanisms such as“chemical fixation” and “physical encapsulation”, as confirmed by heavy metal leaching tests and corrosion experiments.
Abstract
This study established a resource utilization technology system for the blast furnace slag resource recovery (BFS). Usingmanganese-bearing blast furnace slag (MBFS) from Baotou Bayan Obo ore as the primary raw material, glass-ceramics weresuccessfully prepared through the introduction of Cr2O3 and Fe2O3 composite nucleating agents. The research systematicallyelucidates the occurrence patterns and immobilization mechanisms of polymetallic elements (Cr, Mn, Pb) in glass-ceramics,providing theoretical support for high-value utilization of metallurgical solid waste. Experimental results demonstrated thatthe glass-ceramics exhibit a characteristic multi-phase composite structure: the augite phase as the primary crystalline phasegrows attached to spinel, while the wollastonite phase interweaves with residual glass matrix. Heavy metal distribution analysisrevealed that Cr and Mn were predominantly distributed within the spinel phase, whereas Pb showed enrichment in augite,wollastonite, and glass phases. Notably, elevated PbO content tends to induce localized lead-ion enrichment zones withinthe glass phase. The glass-ceramics achieved effective immobilization of multiple heavy metals through mechanisms such as“chemical fixation” and “physical encapsulation”, as confirmed by heavy metal leaching tests and corrosion experiments.