Second is to use high sulphurous coal as internal-combustion coal,i.e.to use S in coal to fix CaO decomposed by CaCO3.These approachs can improve the quality of bricks and rejection rate is lowered.

• 用高硫煤作为内燃煤,即用煤中的硫固定碳酸钙分解形成的氧化钙,从而使砖的质量显著改善。