Method for preparing aerated building block from desulphurized gypsum

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...

Images