Method for utilizing semidry desulfurization waste residues to prepare masonry cement

A semi-dry method of desulfurization and masonry cement technology, which is applied in the direction of cement production, etc., can solve the problems of low dosage, unfavorable treatment and utilization of desulfurization ash in large quantities, low early strength, etc., and achieve large dosage, rapid and effective treatment and utilization , low cost effect

Inactive Publication Date: 2012-06-27
HUNAN UNIV OF SCI & TECH
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Problems solved by technology

However, this kind of mortar also has the following problems: ①Its early strength is low, which limits its application; ②The amount of desulfurization ash in the mortar is too low, which makes the cost of this kind of dry-mixed mortar relatively high. And it is not conducive to a large amount of processing and utilization of desulfurization ash; ③The long-term durability of this kind of construction mortar has not been verified. Experiments show that due to the influence of delayed formation of ettringite, its long-term strength may be seriously reduced or even cracked due to expansion. The risk of its application cannot be ignored

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  • Method for utilizing semidry desulfurization waste residues to prepare masonry cement

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Embodiment Construction

[0017] The present invention will be further described in detail below in conjunction with specific experimental examples.

[0018] (1) Dry the blast furnace slag at first, and the water content of the dried blast furnace slag is 0.8%. Grind the dried blast furnace slag finely, its particle size is 80μm square hole sieve is 5% of the total mass, Blaine specific surface area is 490m 2 / kg. Thereby obtaining blast furnace slag powder meeting the requirements.

[0019] (2) The water content of the semi-dry desulfurization slag is detected, and the content of adsorbed water is 0.7%; the desulfurization slag is off-white to light gray-yellow fine powder, with good dispersibility and fluidity, and an average particle size of 4-10um. BET specific surface area is 2-10m 2 / g, its composition is: the mass percent content is the CaO of 40-50%, the SO of 8-16% 3 , 10-18% SO 2 , 1-3% MgO, 1-2% TFe, 0.2-1.0% SiO 2 , 0.4-0.6% Al 2 o 3 , 1-5% K 2 O, 0.1-0.5% Na 2 O, 1-5% chloride, 1...

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Abstract

The invention discloses a method for utilizing semidry desulfurization waste residues to prepare masonry cement and belongs to the technical field of environmental protection engineering and building material preparation. According to the method provided by the invention, the semidry desulfurization waste residues, few sulphoaluminate cement clinkers, blast furnace slag and limes are dried and milled and then are mixed uniformly in a mixing machine, thereby obtaining the masonry cement. According to the method provided by the invention, the problem that the semidry desulfurization gypsum is difficult to comprehensively utilize due to the complex components is solved; the solid wastes are efficiently utilized; the production cost is low; the main performances, such as strength reach or exceed the national standard of masonry cement; and the method has significance in saving energy, reducing emission and protecting environment.

Description

technical field [0001] The invention belongs to the technical field of environmental protection engineering and building material preparation, and in particular relates to a method for preparing masonry cement by using semi-dry desulfurization waste residue. Background technique [0002] Desulfurization and purification of coal-fired flue gas before discharge into the atmosphere is a rapidly developing environmental protection technology at home and abroad. It has been widely used in various major industrial fields. When lime or slaked lime is used as the desulfurization medium, a large amount of desulfurization gypsum will be produced. Early desulfurization technologies were mainly wet and dry. Wet desulfurization produced a large amount of sludge-like desulfurization gypsum, while dry desulfurization products were generally discharged together with fly ash or slag, and desulfurization gypsum would not be discharged separately . Wet desulfurization gypsum is currently wide...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/153
CPCY02P40/10
Inventor 彭美勋蒋建宏
Owner HUNAN UNIV OF SCI & TECH
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