Study on the Carbon-Thermal Reaction Mechanism of Potassium feldspar and Phosphogypsum

This paper has proved that best material ratio is n (KAlSi3O8) : n (CaSO4) : n (C) = 2:7:3 in carbon-thermal reduction of potash feldspar and phosphogypsum for preparation potassium sulfate, which is based on thermodynamic calculation and analysis, combined with experimental study. XRD analysis shows that generated solid content is K2SO4, CaSiO3 and Ca2Al2SiO7 at the batching system. Under the above ingredients system, the production ways of potassium sulfate have three possible. It depends on operating temperature of the system. At the same time, the phosphogypsum reduction conditions and decomposition rate is controlling factor that potassium sulfate is generated in the system.