The invention relates to a method for preparing
cement clinker from high-proportion
carbide slag through
decomposition outside a
kiln of a five-stage preheater. The method is finished by the steps of
drying carbide slag,
grinding raw materials, and
sintering clinker. The step of the
drying carbide slag simultaneously comprises the substeps of
drying and removing impurities; the step of
grinding the raw materials comprises the substeps of
grinding, and discharging
waste gas; and the step of
sintering the clinker comprises the substeps of preheating outside the
kiln, decomposing outside the
kiln, calcining, and storing the clinker. By implementing the method, the problems of waste residue treatment in the conventional domestic industry for preparing industrial chemicals by an
acetylene method are solved, the waste residues such as carbide slag, crushed limestone, limemud and the like can be utilized to the maximum extent, and the problems of environmental
pollution caused by waste residue treatment are solved. The carbide slag with
water content of less than or equal to 10 percent is directly dried by
waste gas of a kiln
tail; an additional heat source is saved;
waste heat is utilized reasonably; through
air separation of the carbide slag in a dryer,
ferrosilicon is removed from the carbide slag, the problem that
ferrosilicon blocks a grid plate in a mill is solved, the operation of a
raw material mill is separated from the operation of a
rotary kiln, the operation rate of the
raw material mill is reduced, the
raw material mill can adapt to various raw materials of carbide slag, and the capacity of the raw material mill is utilized to the maximum extent.