Fly ash resource utilization treatment system and method

Abstract

The invention relates to a fly ash resource utilization treatment system and method. The fly ash resource utilization treatment system comprises a fly ash pretreatment unit, a first evaporative crystallization unit and a second evaporative crystallization unit; the first evaporative crystallization unit comprises an evaporator, a first thickener, a first centrifugal machine and a buffer tank; the second evaporative crystallization unit comprises an evaporator, a second thickener, a second centrifugal machine and a mother liquor tank; and the evaporator in the second evaporative crystallization unit and the evaporator in the first evaporative crystallization unit jointly form a multi-effect evaporator. The treatment system disclosed by the invention is simple in structure and low in equipment cost, and not only can improve the utilization rate of steam, but also can improve the purity of obtained potassium chloride and sodium chloride products.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a fly ash resource utilization treatment system and method. Background technique [0002] At present, in the field of waste disposal, the proportion of waste incineration is increasing year by year. Waste incineration will produce fly ash, a secondary pollutant, which contains dioxins, heavy metals and other pollutants as well as soluble salts. The soluble salts in fly ash are mainly NaCl, KCl, ZnCl 2 , FeCl 2 Form exists, and the mass fraction of soluble salt is about 15%-30%. Pollutants such as dioxins and heavy metals in fly ash need to be removed, while soluble salts need to be utilized as resources. [0003] Among the soluble salts, potassium chloride and sodium chloride have the most content. The prior art usually utilizes the difference in solubility curves of potassium chloride and sodium chloride to separate these two salts, thereby realizing potassi...

AI Technical Summary

Problems solved by technology

In the prior art, two sets of evaporator equipment are usually used to evaporatively crystallize sodium chloride and potassium chloride respectively, resulting in large steam consumption in the evaporative crystallization system of potassium chloride and sodium chloride, and the steam cannot be fully utilized

Others use a set of evaporators and a set of crystallizers to crystallize sodium chloride and potassium chloride respectively, which has a complex structure and high processing costs.

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