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Method for preparing aerated building block from desulphurized gypsum

A technology of desulfurized gypsum and aerated blocks, which is applied in the field of building materials, can solve the problems of high production energy consumption, large investment, and long time consumption, and achieve the effects of low production energy consumption, simple preparation process, and fine pore structure

Inactive Publication Date: 2014-02-05
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But its biggest defect is that the production process requires high temperature and pressure (temperature around 180°C, pressure around 1.5MPa), time-consuming (8-12 hours), high energy consumption and large investment

Method used

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  • Method for preparing aerated building block from desulphurized gypsum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 56% of desulfurized gypsum, 12% of ordinary Portland cement, 18% of fly ash, 12% of lime, and 2% of aluminate cement by mass. Mix these materials and put them into a mixing container for 2 minutes to obtain a powder. Materials; Take the following materials in proportion to the mass of the powdered materials: 1.0% FJ-PCE II polycarboxylate superplasticizer, 0.04% citric acid, 0.1% aluminum powder; add these materials to a hot water at a temperature of 35°C In water, the ratio of water to material is 0.5; stir to make it fully mixed to obtain liquid material. Put the powdered material into the liquid material and stir for 3 minutes at a stirring speed of 280 rpm to make the slurry evenly mixed.

[0022] Cast the stirred slurry into the mold, and put it at a constant temperature of 35°C to stop for curing for 2 hours; remove the test piece and put it into a curing room with a temperature of 75°C and a humidity of 90°C Carry out 12 hours of damp heat curing; cut the c...

Embodiment 2

[0024] Take 72% of desulfurized gypsum, 8% of ordinary Portland cement, 10% of fly ash, 8% of lime, and 2% of aluminate cement by mass. Mix these materials and put them into a stirring container for 2 minutes to obtain powder. The following materials are taken according to the ratio of the mass of the powdered material: 1.5% FJ-PCE II polycarboxylate superplasticizer, 0.06% citric acid, 0.2% aluminum powder, and these materials are added to the temperature of 40 ℃ In hot water, the ratio of water to material is 0.5; stir to make it fully mixed to obtain a liquid material; put the powder material into the liquid material, and stir at a stirring speed of 280 rpm for 3 minutes to make the slurry evenly mixed.

[0025] Cast the stirred slurry into the mold, and put it in a constant temperature of 50°C to stop for curing for 2 hours; remove the test piece and put it in a curing room with a temperature of 75°C and a humidity of 90°C Carry out 12 hours of humid heat curing; cut the c...

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Abstract

The invention discloses a method for preparing an aerated building block from desulphurized gypsum. The method comprises the following steps: 1), mixing 50-80% of desulphurized building gypsum, 5-15% of ordinary portland cement, 1-5% of high-alumina cement, 5-15% of lime and 8-20% of pulverized coal ash by mass to obtain a mixture and preparing a powder material; 2) taking the mass of the powder material as a reference value 1, getting the following components in percentages by mass: 0.5-1.5% of a high-efficiency water reducing agent, 0.02-0.06% of a retarder, 0.06-0.3% of aluminum powder and 45-55% of water; preparing the high-efficiency water reducing agent, the retarder and the aluminum powder into a liquid material in water at the temperature of 35-50 DEG C; 3) mixing and stirring the powder material and the liquid material for 2-3 minutes to obtain a homogenized slurry, and pouring the slurry into a mold with the temperature of 35-50 DEG C; 4) curing the poured slurry along with the mold for 2-4 hours at the temperature 35-50 DEG C to obtain a test block; and 5) demolding the cured test block and cutting the test block to obtain the aerated building block.

Description

technical field [0001] The invention relates to a method for producing desulfurized gypsum aerated blocks, belonging to the field of building materials. Background technique [0002] According to current statistics, my country's flue gas desulfurization gypsum emissions have reached more than 40 million tons in 2010, but only about 30% of them have been comprehensively utilized, and the rest will continue to be stockpiled. Such a large amount of desulfurized gypsum stockpiling not only occupies a large amount of land, but also brings new environmental problems, such as acidification of soil, pollution of groundwater sources, and dust, which threaten people's health. Therefore, it is a topic of great significance to make better use of desulfurized gypsum, and even to use it as a resource. [0003] Aerated concrete block is a wall material with very superior performance. Compared with concrete products and clay bricks, it has good properties such as light weight, heat preserv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B38/02
Inventor 张磊杨久俊周飞王雪平杨沛森劳有盛关盼盼
Owner TIANJIN CHENGJIAN UNIV
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