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Fly ash washing process for multistage reverse pulping

A technology for pulping and fly ash, which is applied in the field of fly ash water washing process of multi-stage reverse pulping, can solve the problem that the soluble salt of washing liquid cannot be effectively used, and achieve the effects of low cost, saving water consumption and improving washing efficiency.

Active Publication Date: 2022-01-18
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 shortcomings of the above-mentioned prior art, the present invention provides a multi-stage reverse pulping fly ash washing process. The main technical problem to be solved is that the traditional washing process can only achieve the purpose of dechlorination, and there are still a large amount of The soluble salts in the water cannot be fully and effectively utilized

Method used

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  • Fly ash washing process for multistage reverse pulping

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1, such as figure 2 As shown, it includes the following steps:

[0028] Step 1. Mix and stir the fly ash and water according to the solid-to-liquid ratio of 1:3 to make slurry;

[0029] Step 2, using a suction filter to suction filter the pulping product in step 1 to achieve solid-liquid separation to obtain washing liquid and solid residue;

[0030] Step 3, mixing and stirring the solid slag obtained in the previous step 2 and water according to a solid-to-liquid ratio of 1:3;

[0031] Step 4, using a suction filter to filter the pulping product in step 3 to achieve solid-liquid separation, to obtain washing liquid and solid residue, and mixing the washing liquid with the washing liquid obtained in step 2;

[0032] Step 5, mixing and stirring the solid slag obtained in the previous step 4 and water according to the solid-to-liquid ratio of 1:3;

[0033] Step 6, use a suction filter to filter the pulping product in step 5 to achieve solid-liquid separation, ...

Embodiment 2

[0036] Example 2, such as figure 2 As shown, it includes the following steps:

[0037]Step 1. Mix and stir the fly ash and water according to the solid-to-liquid ratio of 1:4 to make slurry;

[0038] Step 2, using a suction filter to suction filter the pulping product in step 1 to achieve solid-liquid separation to obtain washing liquid and solid residue;

[0039] Step 3, mixing and stirring the solid slag obtained in the previous step 2 and water according to the solid-to-liquid ratio of 1:4;

[0040] Step 4, using a suction filter to filter the pulping product in step 3 to achieve solid-liquid separation, to obtain washing liquid and solid residue, and mixing the washing liquid with the washing liquid obtained in step 2;

[0041] Step 5, mixing and stirring the solid slag obtained in the previous step 4 and water according to the solid-to-liquid ratio of 1:4;

[0042] Step 6, use a suction filter to filter the pulping product in step 5 to achieve solid-liquid separation,...

Embodiment 3

[0045] Embodiment 3, it comprises the steps:

[0046] Step 1. Mix and stir the fly ash and water according to the solid-to-liquid ratio of 1:5 to make slurry;

[0047] Step 2, using a suction filter to suction filter the pulping product in step 1 to achieve solid-liquid separation to obtain washing liquid and solid residue;

[0048] Step 3, mixing and stirring the solid slag obtained in the previous step 2 and water according to the solid-to-liquid ratio of 1:5;

[0049] Step 4, using a suction filter to filter the pulping product in step 3 to achieve solid-liquid separation, to obtain washing liquid and solid residue, and mixing the washing liquid with the washing liquid obtained in step 2;

[0050] Step 5, mixing and stirring the solid slag obtained in the previous step 4 and water according to the solid-to-liquid ratio of 1:5;

[0051] Step 6, use a suction filter to filter the pulping product in step 5 to achieve solid-liquid separation, obtain washing liquid and solid r...

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Abstract

The invention discloses a fly ash washing process for multistage reverse pulping. The fly ash washing process comprises the following steps: 1, mixing fly ash and water according to a solid-to-liquid ratio of 1: (3-5), and pulping; 2, performing suction filtration on the pulping product in the step 1 to obtain water washing liquid and solid residues; 3, mixing the solid residues obtained in the previous step with water according to a solid-to-liquid ratio of 1: (3-5) to prepare slurry; 4, performing suction filtration on the pulping product in the step 3 to obtain water washing liquid and solid residues, and mixing the water washing liquid with the water washing liquid obtained in the step 2; 5,sequentially repeating the step 3 and the step 4 for multiple times, and obtaining mixed washing liquid and solid residues after repeating is completed; 6, mixing the solid residues obtained in the step 5 with water according to a solid-to-liquid ratio of 1: (5-8) to prepare slurry; and 7, performing suction filtration on the pulping product in the step 6 to obtain water washing liquid and solid residues, concentrating the water washing liquid by using a DTRO membrane to obtain concentrated water and fresh water, recycling the concentrated water in the step 1 to be mixed with the fly ash for pulping, and recycling the fresh water in the step 6 to be mixed with the solid residues for pulping.

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 multi-stage reverse pulping fly ash washing process. Background technique [0002] The output of fly ash from waste incineration in my country is huge. With the increase in the volume of domestic waste removal and the increase in the proportion of incineration, 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 dioxins, acid gases (such as hydrogen chloride, sulfur dioxide), nitrogen oxides, heavy metal dust, etc. Most of these pollutants will be trapped by the dust removal system to form fly ash during flue gas purification, and the annual production of fly ash is about 10 million tons. Large and medium-sized cities generate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B3/30B09B3/38B09B3/80B09B101/30
CPCB09B3/00Y02P10/20
Inventor 江娜罗成张俊
Owner JIANGXI GAIA ENVIRONMENTAL SCI & TECH CO LTD
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