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Non-fired brick and preparation method thereof

A non-burning brick, semi-dry technology, applied in the field of environmental protection and comprehensive utilization of resources, can solve the problems of easy generation of dust, high cost of landfill, and no treatment plan.

Active Publication Date: 2012-12-05
MAANSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, domestic major steel mills are all launching sintering flue gas desulfurization projects in response to the requirements of the national environmental protection policy. Many manufacturers are interested in it, but the composition of by-products of semi-dry sintering flue gas desulfurization is complex, mainly containing CaSO 3 , CaSO 4 , unreacted Ca(OH) 2 and CaO and other impurities
Due to its complex composition and extremely fine particle size, it is easy to generate dust when stacked in the open air; the alkalinity is very strong, and the pH value of the solution reaches 12.81. If it needs to be disposed of in accordance with the standard of hazardous solid waste, the landfill cost is high; as a low Grade gypsum is used in construction materials due to CaSO 3 High content, prone to expansion and bursting
Therefore, how to dispose of the by-products of semi-dry sintering flue gas has become a major problem at home and abroad, and there is no better treatment plan at present

Method used

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  • Non-fired brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Mix the semi-dry sintering flue gas desulfurization by-products and quicklime in a ratio of 4:1, configure it into a 10% emulsion, react with the waste sulfuric acid solution, and use a fan to aerate the reaction at the same time. The concentrate is air-dried, mixed with sand, fly ash and cement in a ratio of 15:41:36:8, stirred by a wheel roller, and molded under a pressure of 20MPa to produce unburned bricks of 240×120×53. The 7-day compressive strength is 11.6MPa, and the 28-day compressive strength is 35.6MPa. The pressure steaming stability test is carried out under the pressure of 2MPa, and it is qualified.

Embodiment 2

[0014] Mix the semi-dry sintering flue gas desulfurization by-products and quicklime in a ratio of 4:1, configure it into an 11% emulsion, react with the waste sulfuric acid solution, and use a fan to aerate the reaction at the same time. The concentrate is air-dried, mixed with sand, fly ash and cement in a ratio of 15:43:34:8, stirred by a wheel roller, and molded under a pressure of 20MPa to produce unburned bricks of 240×120×53. The 7-day compressive strength is 10.6MPa, and the 28-day compressive strength is 30.6MPa. The pressure steaming stability test is carried out under the pressure of 2MPa, and it is qualified.

Embodiment 3

[0016] Mix the semi-dry sintering flue gas desulfurization by-products and quicklime in a ratio of 4:1, configure it into a 10% emulsion, react with the waste sulfuric acid solution, and use a fan to aerate the reaction at the same time. The concentrate is air-dried, mixed with sand, fly ash and cement in a ratio of 15:45:32:8, stirred by a wheel roller, and molded under a pressure of 20MPa to produce unburned bricks of 240×120×53. The 7-day compressive strength is 11.9MPa, and the 28-day compressive strength is 31.3MPa. The pressure steaming stability test is carried out under the pressure of 2MPa, and it is qualified.

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Abstract

The invention discloses a non-fired brick which consists of gypsum which is prepared from the desulphurisation by-product of sintering flue gas through the semi-dry method, sand, fly ash and cement in a ratio of 15:41-45:32-36:8. The preparation method of the non-fired brick comprises the following steps: mixing the obtained gypsum, sand, fly ash and cement in a ratio of 15:41-45:32-36:8, rollingand stirring, and forming at 20MPa. The preparation method of the gypsum comprises the following steps: mixing the desulphurisation by-product and quick lime in a ratio of 4:1, preparing 10%-12% emulsion in an emulsion-making device, then sending the obtained emulsion in a reaction tank to react with waste sulfuric acid solution and ensure that the pH value of the mixed solution is 6.5-7.5, pumping the mixed solution in a concentration basin to concentrate, discharging wastewater after concentration, pumping the obtained concentrate in a dehydration device for dehydration, and drying after dehydration to obtain gypsum.

Description

technical field [0001] The invention belongs to the field of environmental protection and comprehensive utilization of resources, and in particular relates to an unfired brick prepared by semi-dry sintering flue gas desulfurization by-products and a preparation method thereof Background technique [0002] At present, domestic major steel mills are all launching sintering flue gas desulfurization projects in response to the requirements of the national environmental protection policy. Many manufacturers are interested in it, but the composition of by-products of semi-dry sintering flue gas desulfurization is complex, mainly containing CaSO 3 , CaSO 4 , unreacted Ca(OH) 2 And CaO and other impurities. Due to its complex composition and extremely fine particle size, it is easy to generate dust when stacked in the open air; the alkalinity is very strong, and the pH value of the solution reaches 12.81. If it needs to be disposed of in accordance with the standard of hazardous ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B11/26
Inventor 饶磊陈广言周晨辉刁军吴朝刚汪保平叶平丁陈来张耀辉马孟臣戴玉芬
Owner MAANSHAN IRON & STEEL CO LTD
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