Method for stabilizing CaSO3 in desulfurized fly ash

A desulfurized ash and semi-dry technology, which is applied in the field of solid waste resource utilization, can solve the problems of poor application effect and high processing cost, and achieve the effects of scientific and reasonable technical effect, simple operation and strong practicability.

Active Publication Date: 2016-11-02
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention provides a kind of CaSO in desulfurization ash 3 Stabilization method to solve the problem of CaSO in desulfurization ash in the prior art 3 When exploiting, the technical problems that either deal with high costs or have poor application effects

Method used

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  • Method for stabilizing CaSO3 in desulfurized fly ash

Examples

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Comparison scheme
Effect test

Embodiment 1

[0048] (1) Mix the desulfurization ash and the rock-stripping tailings particles evenly, wherein the total mass of the desulfurization ash is 10% of the total mass of the rock-stripping tailings particles, take a certain amount of samples, place them in an oven at 105°C and heat them to constant weight, And the CaSO in the mixture was determined by iodometric method 3 The content accounts for 2.8% of the total mass of the mixture;

[0049] (2) Spray water accounting for about 10% of the total mass of the mixture in the mixture;

[0050] (3) Use cotton cloth to cover the mixture, and sprinkle about 5% water of the total mass of the mixture to the mixture every 7 days for maintenance, and continue to maintain for 8 weeks;

[0051] (4) After 7 days from the last replenishment of water, remove the cotton cloth, let the mixture dry naturally for 3 days, take a certain amount of samples, place them in an oven at 105°C and heat them to constant weight, and measure the CaSO in the mi...

Embodiment 2

[0053] (1) Mix the desulfurization ash and the rock-stripping tailings particles evenly, wherein the total mass of the desulfurization ash is 15% of the total mass of the rock-stripping tailings particles, take a certain amount of samples, place them in an oven at 105°C and heat them to constant weight, And the CaSO in the mixture was determined by iodometric method 3 The content accounts for 4.8% of the total mass of the mixture;

[0054] (2) Spray water accounting for about 10% of the total mass of the mixture in the mixture;

[0055](3) Use cotton cloth to cover the mixture, and sprinkle water of about 7% of the total mass of the mixture to the mixture every 7 days for maintenance, and maintain for 9 weeks;

[0056] (4) After 7 days from the last replenishment of water, remove the cotton cloth, let the mixture dry naturally for 3 days, take a certain amount of samples, place them in an oven at 105°C and heat them to constant weight, and measure the CaSO in the mixture by i...

Embodiment 3

[0058] (1) Mix the desulfurization ash and the rock-stripping tailings particles evenly, wherein the total mass of the desulfurization ash is 15% of the total mass of the rock-stripping tailings particles, take a certain amount of samples, place them in an oven at 105°C and heat them to constant weight, And the CaSO in the mixture was determined by iodometric method 3 The content accounts for 4.1% of the total mass of the mixture;

[0059] (2) Spray water accounting for about 12% of the total mass of the mixture in the mixture;

[0060] (3) Use cotton cloth to cover the mixture, and sprinkle water accounting for about 7% of the total mass of the mixture to the mixture every 7 days for maintenance, and continue to maintain for 6 weeks;

[0061] (4) After 7 days from the last replenishment of water, remove the cotton cloth, let the mixture dry naturally for 3 days, take a certain amount of samples, place them in an oven at 105°C and heat them to constant weight, and measure the...

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Abstract

The invention relates to the field of solid waste resource utilization, discloses a method for stabilizing CaSO3 in desulfurized fly ash, and aims at solving the technical problem that the utilization of the CaSO3 in the desulfurized fly ash is relatively high in treatment cost and bad in application effect in the prior art. The method comprises the following steps: firstly obtaining a mixture of the sulfurized fly ash and stripping rock tailings particles, wherein the total mass of the desulfurized fly ash is 5-20% of the total mass of the stripping rock tailings particles; spraying a preset amount of water in the mixture of the sulfurized fly ash and the stripping rock tailings particles, wherein the water yield is 10-15% of the total mass of the mixture; and finally covering the mixture through a screen, and maintaining the mixture through spraying water which is 5-10% of the total mass of the mixture to the mixture every 5-7 days, wherein the maintenance time length is 6-13 weeks so that the CaSO3 in the desulfurized fly ash generates ettringite. According to the method disclosed in the invention, the technical effect of reducing the treatment cost while the desulfurized fly ash is effectively utilized is achieved.

Description

technical field [0001] The invention relates to the field of resource utilization of solid waste, in particular to a CaSO 3 stabilization method. Background technique [0002] The semi-dry sintering flue gas desulfurization process is a common flue gas purification technology. Typical processes include CFB method, SDA method, MEROS method, NID method, etc. In these processes, quicklime is often used as a desulfurizer, and the quicklime is first transformed through a digestion process. In order to digest the lime, it enters the desulfurization tower and the SO in the flue gas 2 The reaction produces CaSO 3 . CaSO 3 In the semi-dry flue gas desulfurization process, only a small amount is oxidized to CaSO 4 , a large amount of CaSO 3 Enter the end by-product desulfurization ash. Practice shows that the chemical composition of semi-dry sintering flue gas desulfurization ash is mainly about CaSO 3 1 / 2H 2 O accounts for 25-40%, CaSO 4 2H 2 O accounts for 5-15%, Ca(OH) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B3/25
Inventor 康凌晨胡轶李富智汤静芳陈云卢丽君薛改凤熊家剑李丽坤
Owner 武汉钢铁有限公司
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