Study on crystallization kinetics and curing mechanism of the multiple heavy metals in slag glass-ceramics

In this paper, manganese-containing blast furnace slag (MBFS) was used as the main raw material and Cr2O3 was used as the nucleating agent to prepare MBFS glass-ceramic by melting method. The influence of multiple heavy metal ions on the crystallization characteristics, physical and chemical properties of glass-ceramic was studied by adding CuO and ZnO, and the existence of multiple heavy metal ions in glass-ceramic and its curing effect were determined. The results showed that Cr was the key element for crystallization of glass-ceramic, which can enable volume crystallization to occur. The glass-ceramics with diopside as the main crystalline phase had excellent comprehensive physical and chemical properties. The results of TCLP heavy metal leaching experiments also confirmed that spinel crystal wrapped by diopside and glass phase can produce an excellent solidification effect on multiple heavy metals.