Measurement and control of containing-fluorine particulate matter emission during spent pot lining combustion detoxification process

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 CaSiO 3 were investigated. The results showed that NaF and Na 3 AlF 6 were found to be the main compositions of PM, and the particle size distribution of PM shows a bimodal distribution. CaSiO 3 substantially inhibited the emission of PM by transforming NaF, Na 3 AlF 6 , and CaF 2 into stable Ca 4 Si 2 O 7 F 2 . Moreover, CaSiO 3 also limited the formation of high hazardous PM 0.2 by providing SiO 2 , Al 2 O 3 , and NaAlSiO 4 with high melting points as the core of promoting the growth of PM in particle size.