Abstract
In the condition of high heating rate, studing on phosphogypsum reductive decomposition by novel reducer. The article study novel reducer high-sulfur coal and coal gangue's reactant ratio, sizes of raw material, reaction temperature effect phosphogypsum decomposition sulfur dioxide's concentration and the main composition calcium sulfate's the rate of decomposition and desulphurization. The results show that the best reaction conditions are C/S molar ratio is 0.7, high-sulfur coal and coal gangue' size of raw material is 100×10^<-9>m^3, the temperature is more than 1000℃. There are the best reaction results in this condition. The concentration of sulfur dioxide is more than 20%. Phosphogypsum's the main composition calcium sulfate's the rate of decomposition is more than 90% and its desulphurization is more than 85%. These provide technology parameters and theory basis for high sulfur coal and coal gangue reduction decompistion phosphogypsum to preparation high concentration sulfur dioxide. These can solve the problems of the current process and system. The first problem was the concentration of sulfur dioxide is low and great fluctuation. The second problem was the cost of making acidic is high. At the same time solid residue can act as the raw of the production of cement.
