Abstract
Currently, phosphogypsum (PG) pollution is a global problem. The reductive decomposition of PG to produce sulfuric acid is a good way to utilize this material. However, the solid–solid reaction between PG and calcium sulfide is an unavoidable step during this reaction. Silicon dioxide (SiO2) was the highest content of impurities during this reaction system, and it varies from 8 to 22 %. PG from different sources may differ with respect to the constituents and their amounts. Hence, the influence of the SiO2 on the melting characteristics of solid–solid reaction system was investigated in this paper. The melting phenomenon was clearly observed using scanning electron microscopy. Meanwhile, the melting temperature was decreased with an increased content of SiO2, which was illustrated using an ash fusion point determination meter and differential scanning calorimetry. Through phase diagram analysis, the reason for the changed melting temperature was discussed. The migration process of solid products was also illustrated. The results of the equilibrium analysis and phase diagram were obtained using FactSage6.1 software.
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