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A kind of sintering flue gas semi-dry desulfurization ash autoclaved brick and its production method

A technology of semi-dry desulfurization and sintering flue gas, applied in the field of sintering flue gas semi-dry desulfurization ash autoclaved bricks, to achieve the effect of increasing availability and usage, stable raw material properties and good stability

Active Publication Date: 2015-11-18
MAGANG (GROUP) HOLDING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a semi-dry sintered flue gas desulfurization ash autoclaved brick and its production method to solve the above-mentioned problem of resource utilization of sintered flue gas semi-dry desulfurization ash, and the obtained product has high yield, good performance and stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: (1) Formula: 47% water slag + 20% fly ash + 20% petite (belonging to quarry gravel) + 10% sintering flue gas (semi) dry desulfurization ash + 3% cement; (2) The production method is: catalytic oxidation of sintering flue gas (semi) dry desulfurization ash under low temperature conditions, so that the unstable calcium sulfite in it is oxidized into stable calcium sulfate; the treated desulfurization ash, Mix stone salt, fly ash and cement in a mixer for 10 minutes, add water to make the moisture content of the wet basis about 14%, and after mixing evenly, press it on the molding equipment under 20MPa pressure, and then send it to the autoclave for steam curing 24h, set the steam pressure to 0.8MPa, steam curing temperature to 180°C, and finally after 60 days of natural curing, the finished product will be obtained, and the performance of the finished product will meet the requirements of qualified products in the relevant national standards.

Embodiment 2

[0031] Example 2: (1) Formula: 45% water slag + 25% fly ash + 20% calciner + 5% sintering flue gas (semi) dry desulfurization ash; (2) The production method is: under low temperature conditions The sintered flue gas (semi) dry desulfurization ash after catalytic oxidation is mixed with petal, fly ash and cement and stirred in a mixer for 10 minutes, and water is added to make the moisture content of the wet basis about 13%. It is molded under 40MPa pressure, and then put into an autoclave for 10 hours, set the steam pressure to 0.8MPa, and the steam curing temperature to 180°C, and finally the finished product is obtained after natural curing for 14 days.

Embodiment 3

[0032] Example 3: (1) Formula: 35% water slag + 25% fly ash + 20% calciner + 15% sintering flue gas (semi) dry desulfurization ash + 5% cement; (2) The production method is: The sintered flue gas (semi) dry desulfurization ash after catalytic oxidation under low temperature conditions is mixed with salt, fly ash and cement and stirred in a mixer for 10 minutes, and water is added to make the moisture content of the wet basis about 15%, and the mixture is evenly mixed Afterwards, it is pressed on the molding equipment under a pressure of 40 MPa, and then sent to an autoclave for 24 hours of steam curing. The steam pressure is set at 0.8 MPa, and the steam curing temperature is 180 ° C. Finally, after 60 days of natural curing, the finished product is obtained.

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PUM

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Abstract

The invention relates to a sintering flue gas semi-dry desulfurization ash autoclaved brick and a production method therefor. The method comprises the following steps: sintering flue gas semi-dry desulfurization ash is subjected to catalytic oxidation at a low temperature; the treated desulfurization ash, stone chips, fly ash and / or cement are stirred in a stirrer; water is added; after the mixture is stirred uniformly, compression molding is carried out in a molding device; the above products are sent to an autoclave and steam curing is performed; curing is carried out. The problem of reutilization of sintering flue gas semi-dry desulfurization ash is solved, the finished product rate of the obtained products is high, and performances are good and stable.

Description

technical field [0001] The invention relates to resource utilization of industrial solid waste residues, in particular to a semi-dry sintering flue gas desulfurization ash autoclaved brick and a production method thereof. Background technique [0002] The iron and steel industry is a highly resource-intensive industry, a major consumer of materials, and one of the major air polluting industries. If the iron and steel industry wants to maintain sustainable development, it must reduce environmental pollution, and reduce SO 2 Emissions are one of the key links. In the current steel industry, SO 2 Emissions mainly come from the sintering process. At present, there are many flue gas desulfurization methods used in industrial production at home and abroad, which can be generally divided into three categories: wet desulfurization using absorbent aqueous solution to wash flue gas, absorbent slurry spray sulfur absorption and dry semi-dry desulfurization and direct injection Dry ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00
Inventor 周晨辉周新平饶磊丁陈来
Owner MAGANG (GROUP) HOLDING CO LTD