SO2 emissions from cement enterprises are mainly sulfur brought in from raw materials, sulfur in raw materials in the form of organic sulfur, sulfide and sulfate, of which sulfide is mainly pyrite and albite (both FeS2), sulfate mainly includes gypsum (CaSO4-2H2O) and hard gypsum (CaSO4).

It is estimated that SO2 emissions from the cement industry account for 3% to 4% of the national SO2 emissions. The SO2 emission of cement enterprises mainly comes from sulfide in raw materials.