Method of and apparatus for treating chlorine-containing waste

Abstract

The invention provides a method for the disposal of chlorine-containing waste which can separate and recover chlorine components from chlorine-containing waste and which attains high chlorine removal efficiency, formation of high-purity chlorine compounds, and reduction in the water consumption for the recovery of chlorine; and equipment for the disposal thereof. The method is characterized by comprising the water-washing and filtration step of separating a slurry containing chlorine-containing waste and water into a solid matter and a filtrate and recycling the solid matter as raw material for cement, the filtration step of adding a reducing agent and a pH regulator to the filtrate to form a precipitate containing heavy metals and calcium and separating the precipitate by filtration, the crystallization step of concentrating the obtained filtrate under heating through evaporation to form a slurry containing crystals of chlorine compounds, separating this slurry into a solid matter containing chlorine compounds and a mother liquor, and recovering the solid matter, and the mother liquor disposal step of recycling part of the mother liquor to a cement production plant.

Description

technical field [0001] The invention relates to a treatment method and device for chlorine-containing wastes. More specifically, chlorine-containing wastes such as incineration ash or cement kiln exhaust or exhaust powder are treated in a closed system as harmless A chlorine-containing waste treatment method and treatment device that can be recycled as cement raw materials, and at the same time, the removed components can be recovered with a quality that can be reused as industrial raw materials. Background technique [0002] In recent years, in cement manufacturing facilities, with the increase in the amount of industrial waste to be processed, volatile components such as chlorine contained in industrial waste have increased in the kiln, and there is concern that it may adversely affect the quality of cement or the operation of the cement kiln system. . Therefore, as a countermeasure against this, a chlorine bypass device that removes chlorine from cement manufacturing fac...

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Problems solved by technology

[0010] However, in the conventional chlorine bypass powder treatment method, since the wastewater contains heavy metals, it is necessary to separately remove the heavy metals, and there is a problem that waste treatment costs increase.

[0011] In addition, the chlorides obtained in the process of separating and recovering chlorides by precipitation are not necessarily high-purity products, so there are cases where high-purity chlorides that can be effectively used cannot be obtained.

[0012] In addition, there is a problem that a large amount of energy is required to precipitate calcium carbonate or chloride

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