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

A high-salt wastewater and bypass ash technology, applied in chemical instruments and methods, perchlorate, ammonium chloride, etc.

Active Publication Date: 2019-04-23
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the above-mentioned technical problems, the present invention utilizes the salty waste water in the washing process and the bypass ash to make full use of existing resources (such as ammonia water and carbon dioxide in cement enterprises) to obtain a variety of high-purity chemical products, It improves the added value of the product and effectively makes up for the defect that the existing cement kiln co-processing fly ash technology only has a single type of product (crystalline salt)

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] This embodiment provides a joint resource utilization method of washing fly ash high-salt wastewater and bypass ash, such as figure 1 shown, including:

[0052] Step S1, stirring and mixing the bypass hot raw meal, water, washing and incineration fly ash salty waste water and 15% concentration of hydrochloric acid solution according to a certain ratio to form a mixed solution containing solids. The pH of the mixed solution containing solids is 5.5. After mixing, the water The mass ratio of the mass to the bypass hot raw material is 4, and the solid-liquid separation is carried out to the mixed solution containing the solid, and the first solution (containing a small amount of solid) and the first solid are separated.

[0053] Step S2, performing solid-liquid separation on the first solution in step S1 to obtain a first filtrate and a first filter residue, the first filtrate enters the next step process, and a small amount of solid exists in the first filtrate.

[0054]...

Embodiment 2

[0064] This embodiment provides a joint resource utilization method of washing fly ash high-salt wastewater and bypass ash, including:

[0065] Step S1, stirring and mixing the bypass kiln dust, tap water, washed and incinerated fly ash high-salt wastewater and 20% sulfuric acid solution according to a certain ratio to form a mixed solution containing solids, the pH of the mixed solution containing solids is 5, and the water after mixing The mass ratio of the mass to the bypass kiln dust is 3, and the mixed solution containing the solid is subjected to solid-liquid separation to separate the first solution (containing a small amount of solid) and the first solid.

[0066] Step S2, performing solid-liquid separation on the first solution in step S1 to obtain a first filtrate and a first filter residue, the first filtrate enters the next step process, and a small amount of solid exists in the first filtrate.

[0067] In step S3, the first solid in step S1 and the first filter re...

Embodiment 3

[0077] This embodiment provides a joint resource utilization method of washing fly ash high-salt wastewater and bypass ash, including:

[0078] Step S1, mix the bypass air ash, seawater, washed and incinerated fly ash high-salt wastewater and 20% hydrochloric acid solution according to a certain ratio to form a mixed solution containing solids, the pH of the mixed solution containing solids is 5.5, the mass of water after mixing The mass ratio to the bypass ash is 2.5, and the mixed solution containing solids is subjected to solid-liquid separation to separate the first solution (containing a small amount of solids) and the first solid.

[0079] Step S2, performing solid-liquid separation on the first solution in step S1 to obtain a first filtrate and a first filter residue, the first filtrate enters the next step process, and a small amount of solid exists in the first filtrate.

[0080] In step S3, the first solid in step S1 and the first filter residue in step S2 are combin...

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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 ...

Claims

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Application Information

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IPC IPC(8): C01B11/18C01D3/06C01D7/00C01C1/16C01F11/46
CPCC01B11/18C01C1/164C01D3/06C01D7/00C01F11/462
Inventor 李寅明黄天勇
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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