Patent ID: 8048314

Claim:
A method for treating a chlorine-containing waste in which an inorganic component contained in a chlorine-containing waste is used as a cement raw material and also chlorine contained in the chlorine-containing waste is recovered, the method comprising: a washing/filtrating step of adding water to the chlorine-containing waste, followed by mixing to form a first slurry, separating the first slurry into a solid and a filtrate through filtration, and using the resulting solid as a cement raw material; a filtrate treating step of adding a reducing agent, a pH adjustor, and potassium carbonate to the filtrate to form a sediment containing heavy metal and calcium carbonate contained in the filtrate, and separating the sediment through filtration; a crystallization step of concentrating the filtrate, from which the sediment has been removed, through heating and evaporation to form a second slurry in which a chlorine compound contained in the filtrate has been crystallized, separating the second slurry into a solid containing a chlorine compound including potassium chloride and a mother liquor, and recovering the solid; and a separated mother liquor treating step of returning a portion of the mother liquor to a cement manufacturing facility.