Abstract
The particle size distribution (PSD), composition, morphology, and formation mechanism of particulate matter (PM) released from the combustion of spent pot lining with and without CaSiO3 were investigated. The results showed that NaF and Na3AlF6 were found to be the main compositions of PM, and the particle size distribution of PM shows a bimodal distribution. CaSiO3 substantially inhibited the emission of PM by transforming NaF, Na3AlF6, and CaF2 into stable Ca4Si2O7F2. Moreover, CaSiO3 also limited the formation of high hazardous PM0.2 by providing SiO2, Al2O3, and NaAlSiO4 with high melting points as the core of promoting the growth of PM in particle size.
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