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Cement kiln co-processing fly ash solidification method

A co-processing and cement kiln technology, applied in cement production and other fields, can solve secondary pollution control and other problems

Active Publication Date: 2020-09-15
浙江红狮环保股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above inventions and prior art solidified fly ash all use water washing to wash away the soluble chlorides in the fly ash, but the soluble heavy metal salts in the fly ash will also be in the washing liquid, and there are secondary pollution and governance problems.

Method used

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  • Cement kiln co-processing fly ash solidification method
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  • Cement kiln co-processing fly ash solidification method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A method for co-processing solidified fly ash in a cement kiln, the main scheme of which is:

[0030] A, mixing, 150kg fly ash, 5kg heavy metal chelating agent, 5kg glass slag powder, 5kg scrap iron slag and 10kg water are added in the pre-mixer, stirred and mixed for 10 minutes;

[0031] B. Pulping, continue to add 60kg of water to the material, and transport the material to the pulping machine for mixing and stirring for 20 minutes, then feed the cement kiln flue gas into the slurry, and mix for 5 minutes;

[0032] C, dehydration, the obtained material slurry is dehydrated, and in obtaining the dry slurry, add 0.5kg flux;

[0033] D. Calcination. The obtained dry slurry is mixed with cement raw meal at a ratio of 10%, and then entered into a rotary kiln as a raw material for the production of cement clinker, and calcined at 1200°C.

[0034] Described heavy metal chelating agent, its preparation method is as follows:

[0035] Add 60kg of tetramethyl (hydrogen) disilo...

Embodiment 2

[0043] A method for co-processing solidified fly ash in a cement kiln, the main scheme of which is:

[0044] A, mixing materials, 180kg fly ash, 7kg heavy metal chelating agent, 12kg glass slag powder, 8kg scrap iron slag and 20kg water are added in the pre-mixer, stirred and mixed for 20min;

[0045] B. Pulping, continue to add 65kg of water to the material, and transport the material to the pulper for mixing and stirring for 25 minutes, then feed the cement kiln flue gas into the slurry, and mix for 8 minutes;

[0046] C, dehydration, the obtained material slurry is dehydrated, and in obtaining the dry slurry, add 0.8kg flux;

[0047] D. Calcination. The obtained dry slurry is mixed with cement raw meal according to the ratio of 12%, and it is used as a raw material for the production of cement clinker into a rotary kiln, and calcined at 1300°C.

[0048] Described heavy metal chelating agent, its preparation method is as follows:

[0049] 80kg of tetramethyl (hydrogen) disil...

Embodiment 3

[0057] A method for co-processing solidified fly ash in a cement kiln, the main scheme of which is:

[0058] A, mixing materials, 200kg fly ash, 10kg heavy metal chelating agent, 23kg glass slag powder, 12kg scrap iron slag and 30kg water are added in the pre-mixer, stirred and mixed for 30min;

[0059] B. Pulping, continue to add 70kg of water to the material, and transport the material to the pulping machine for mixing and stirring for 30 minutes, then feed the cement kiln flue gas into the slurry, and mix for 10 minutes;

[0060] C, dehydration, the obtained material slurry is dehydrated, and in obtaining the dry slurry, add 1kg flux;

[0061] D. Calcination. The obtained dry slurry is mixed with cement raw meal at a ratio of 15%, and then entered into a rotary kiln as a raw material for the production of cement clinker, and calcined at 1400°C.

[0062] Described heavy metal chelating agent, its preparation method is as follows:

[0063] 100kg of tetramethyl (hydrogen) di...

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Abstract

The invention relates to the field of environmental protection, in particular to a cement kiln co-processing fly ash solidification method. The cement kiln co-processing fly ash solidification methodcomprises the steps of material mixing, pulping, dehydration, calcination and the like. The invention provides a method for co-processing solidified fly ash by using a cement kiln. According to the method, soluble chloride in the fly ash is washed away in a pulping manner; meanwhile, under the action of the heavy metal chelating agent, soluble heavy metal salt is chelated and precipitated and is fixed in dry slurry, and meanwhile, the heavy metal salt dissolved in the slurry is further cured by utilizing carbon dioxide gas contained in cement kiln flue tail gas so that the obtained waste liquid does not need to be subjected to secondary treatment; according to the method, the flue tail gas of the cement kiln and the high temperature of the rotary kiln are comprehensively utilized, and thepurpose of volume reduction and weight reduction comprehensive utilization in waste treatment is achieved.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for co-processing solidified fly ash in a cement kiln. Background technique [0002] Domestic waste incineration has a good effect on the removal of combustible substances, but for the heavy metals contained in it, the total amount of heavy metals usually does not change after incineration, and most of the heavy metals will be distributed in 0.5% of the total amount of incinerated waste. -3.0% in the incineration fly ash; the analysis results of the incineration fly ash show that the incineration fly ash is not a chemically inert substance, which contains a relatively high concentration of harmful heavy metals and salts that can be leached by water. If it is not handled properly, it will be It pollutes groundwater and the surrounding environment, so it is a harmful substance. How to dispose and utilize incineration fly ash safely and effectively has become an envi...

Claims

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Application Information

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IPC IPC(8): C04B7/42C04B7/26C04B7/24C04B7/147C04B7/38C04B7/44
CPCC04B7/147C04B7/243C04B7/38C04B7/421C04B7/425C04B7/428C04B7/47Y02P40/10
Inventor 童亮唐柯李春萍黄敏锐黄学慧郭小露陈慧斌
Owner 浙江红狮环保股份有限公司
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