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Carbon dioxide high-pressure extraction and decalcification process for fly ash

A carbon dioxide extraction technology, applied in the chemical industry, calcium carbonate/strontium/barium, chemical instruments and methods, etc., can solve the problems of impossibility, saving energy consumption and operating costs, increasing costs, etc., to achieve low cost, The effect of improving the washing efficiency

Active Publication Date: 2022-01-21
JIANGXI GAIA ENVIRONMENTAL SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a carbon dioxide high-pressure extraction and decalcification process for fly ash. Disposal will increase additional costs. Although it is harmless to hazardous waste, it cannot save energy and operating costs.

Method used

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  • Carbon dioxide high-pressure extraction and decalcification process for fly ash
  • Carbon dioxide high-pressure extraction and decalcification process for fly ash

Examples

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Effect test

Embodiment 1

[0021] Example 1, such as figure 1 As shown, it includes the following steps:

[0022] Step 1, prepare a slurry by washing the fly ash with water, pass carbon dioxide gas into the slurry to adjust the pH value to 6-8, and then use a suction filter to filter the prepared slurry to obtain a washing solution and solid residue; the washing The liquid is harmless and resource-based, firstly remove the heavy metal elements in the washing liquid, and then remove the calcium and magnesium ions in the washing liquid to reduce the hardness of the washing liquid, and finally remove the remaining washing liquid Perform evaporation and crystallization to obtain potassium salt and sodium salt, specifically: add a chelating agent to the washing liquid to remove the heavy metals contained therein, obtain heavy metal slag and primary purification liquid; add NaOH to the obtained primary purification liquid Adjust the pH to 12, then pass CO 2 , to obtain the mixed slag of calcium carbonate an...

Embodiment 2

[0026] Embodiment 2, it comprises the steps:

[0027] Step 1. Using multi-stage reverse pulping fly ash washing method,

[0028] 1) Mix fly ash and water according to the solid-to-liquid ratio of 1:3-5 to prepare slurry, and at the same time, pass carbon dioxide gas into the slurry to adjust the pH value to 6-8;

[0029] 2) Use a suction filter to filter the slurry prepared in 1) to obtain high-concentration washing liquid and solid residue;

[0030] 3) Mix the solid slag obtained in 2) with water at a solid-to-liquid ratio of 1:3-5 to prepare a slurry;

[0031] 4) Use a suction filter to filter the slurry prepared in 3) to obtain high-concentration washing liquid and solid residue;

[0032] 5) Mix the solid slag obtained in 4) with water at a solid-to-liquid ratio of 1:3-5 to prepare a slurry;

[0033] 6) Use a suction filter to filter the slurry prepared in 5) to obtain high-concentration washing liquid and solid residue;

[0034] 7) Mix the solid slag obtained in 6) wit...

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Abstract

The invention relates to a carbon dioxide high-pressure extraction decalcification process for fly ash, which comprises the following steps: 1, washing fly ash with water to prepare slurry, and carrying out suction filtration on the prepared slurry to obtain water washing liquid and solid slag; 2, washing the solid residues with water to prepare slurry, converting calcium contained in the solid residues into calcium bicarbonate by adopting carbon dioxide high-pressure extraction, and dissolving the calcium bicarbonate in water; 3, performing suction filtration on the slurry subjected to carbon dioxide high-pressure extraction to obtain residual solid residues and water washing liquid, and decomposing calcium bicarbonate in the water washing liquid at normal temperature and normal pressure to generate calcium carbonate; and 4, calcining the calcium carbonate obtained in the step 3 to obtain quick lime and carbon dioxide gas, wherein the carbon dioxide gas is reused in the carbon dioxide high-pressure extraction stage in the step 2. According to the method, calcium carbonate is separated from solid residues obtained after fly ash washing in a carbon dioxide high-pressure extraction mode, the method is more convenient than a cement kiln synergistic process, and carbon dioxide can be recycled for fly ash washing and carbon dioxide high-pressure extraction stages through calcium carbonate calcination.

Description

technical field [0001] The invention belongs to the technical field of harmless treatment of fly ash produced by garbage incineration, and in particular relates to a carbon dioxide high-pressure leaching decalcification process of fly ash. Background technique [0002] The output of waste incineration fly ash in my country is huge. Fly ash is the residue collected in the flue gas purification system (APC) and heat recovery system (such as economizers, boilers, etc.), accounting for about 30% of the total waste incineration ash. About 20%, it is the material collected by the flue gas dust collector after the domestic waste is incinerated. With the increase of the amount of domestic waste removed and the proportion of incineration treatment, the waste incineration industry will grow explosively. By the end of 2020, the total amount of waste incineration will reach 591,400 tons per day. During the process of waste incineration, many harmful substances will be produced, such as d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/02C01F11/18B01D11/02
CPCC04B2/02C01F11/18B01D11/02B01D11/0219B01D11/0207B01D2011/005Y02P20/10Y02P20/50Y02W30/20
Inventor 柴喜林徐光前徐丽琴
Owner JIANGXI GAIA ENVIRONMENTAL SCI & TECH CO LTD
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