Combined resource utilization method for washing fly ash high-salinity wastewater and bypass ash

Abstract

The invention relates to a combined resource utilization method for washing fly ash high-salinity wastewater and bypass ash. The method is capable of using fly ash washing liquid, water, and acid to dissolve and extract soluble components in incineration fly ash and the bypass ash, and through a series of treatment, acquiring multiple chemical products with higher purity. The method is convenientin raw material source, rational in process route, and capable of effectively expanding an utilization mode of the incineration fly ash and the bypass ash, realizing product diversification and improving an additional value of the product, effectively remedying a problem that only a crystalloid salt product is produced in a cement kiln co-processing fly ash process, and effectively using a carbondioxide resource.

Description

technical field

[0001] The invention relates to a method for jointly preparing potassium perchlorate, sodium bicarbonate, ammonium chloride and sodium chloride by using washed fly ash high-salt wastewater and bypass ash, and belongs to the field of environmental protection and resource utilization. Background technique

[0002] The waste incineration process will produce a large amount of fly ash, which cannot be directly landfilled because it contains a large amount of soluble heavy metals and dioxins. It is classified as hazardous waste (HW18), and it must be disposed of safely.

[0003] The first domestic cement kiln co-processing waste incineration fly ash technology mainly includes three parts: washing and drying, water treatment, and cement kiln calcination. During the washing process of fly ash, about 30% of soluble salts (mainly chlorine salts, containing a large amount of harmful components such as potassium and sodium to the calcining of cement) and a small amount ...

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