Emission and formation mechanism of sulfur dioxide in sintering process of coal ash ceramisite
粉煤灰烧制陶粒过程中二氧化硫的释放规律与形成机理

The emission of sulfur dioxide in the sintering process of coal ash ceramisite was investigated in detail, the sulfur content of different forms in coal ash and ceramisite was determinated, and the origin and formation mechanism of flue gas sulfur dioxide were also discussed. The experimental results show that 55% of sulfur dioxide originates from sulfate sulfur, and the rest of sulfur dioxide is mainly from the combustion of organic sulfur and decomposition of sulfite. It is also demonstrated that the discharge amount of sulfur dioxide for production of 1 kg ceramisite is about 7.8 g. The transformation from calcium sulfate to sulfur dioxide at high temperature results from reductive atmosphere formed in the coal ash ceramisite.