Resourceful treatment device and process for mother liquor of reaction between waste incineration fly ash and hydrochloric acid

Abstract

The invention provides a resourceful treatment process for mother liquor of reaction between waste incineration fly ash and hydrochloric acid. The process comprises the following steps: removing impurities from the mother liquor, carrying out evaporative crystallization to separate out salt, removing superfluous calcium hydroxide and calcium sulfate, and carrying out evaporative crystallization toseparate out mixed salt mainly containing sodium chloride and potassium chloride. The mother liquor can be prepared into two products: path 1, continuring concentrating, and performing cooling and crystallizing to obtain calcium chloride dihydrate flakes; and path 2, concentrating or diluting the mother liquor until the content of calcium chloride is about 45%, and performing granulating and drying in a fluidized bed. The invention further provides a resourceful treatment device for mother liquor of reaction between waste incineration fly ash and hydrochloric acid. The device comprises a flyash storage tank, a hydrochloric acid storage tank, a neutralization reaction kettle, a first filtering device, a pH adjusting device, a second filtering device, an evaporation crystallization device,a first evaporation concentration device, a flaking device, a drying device, a dilution device, a boiling granulation device and a second evaporation concentration device, According to the invention,complete recycling of the mother liquor of the reaction between the waste incineration fly ash and hydrochloric acid is realized, and zero discharge of wastewater is also realized.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a resource treatment device and process for mother liquor obtained by reacting waste incineration fly ash and hydrochloric acid. Background technique [0002] With the rapid development of my country's urban economy, the output of urban waste is increasing day by day, with an average annual growth rate of 8-10%. The basic treatment methods of municipal solid waste at home and abroad are landfill, incineration and composting. The incineration method has a small footprint, short treatment time, and significant reduction (mass reduction can generally reach 70%, and volume reduction can reach 90%) , more thorough harmless treatment, and the waste heat of recyclable waste incineration have gradually become the trend of urban waste treatment. [0003] Waste incineration fly ash refers to the incineration residue collected in the flue gas purification system of waste i...

AI Technical Summary

Problems solved by technology

However, this solution has the disadvantages of unstable calcium chloride hexahydrate crystals, easy reverse dissolution, and difficult solid-liquid separation, which lead to difficulties in the production process control of anhydrous calcium chloride and difficult continuous and stable production.

[0006] In addition, the patent application number: 202010049471.7 in the patent of cooling and crystallization to obtain calcium chloride hexahydrate crystallization solution, because the calcium chloride hexahydrate is dried to prepare dihydrate or anhydrous calcium chloride, the energy consumption is relatively high

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