Step temperature autoclave curing method for fly ash unburned bricks

Abstract

The invention provides a coal ash baking-free brick stepped temperature autoclaved curing method which solves the problems that an existing coal ash baking-free brick autoclaved curing method is overhigh in curing temperature, overlong in curing period and large in energy consumption, a baking-free brick is ripe outside and raw inside, low in strength and poor in freezing resistance, and the baking-free brick cracks and corners of the brick fall off. The method comprises four stages, the heat preservation temperatures of the four stages are 110-120 DEG C, 130-140 DEG C, 150-160 DEG C and 180-200 DEG C respectively, the time of the first three stages for heat preservation is 0.5-2 hours, and the time of the fourth stage is 2-6 hours. By means of the method, the internal temperature and the outside temperature of the coal ash baking-free brick are small, size changing is even, the cracking and corner-falling phenomena can not happen, the strength of the coal ash baking-free brick is improved, high-temperature autoclaved curing time is shortened, and energy consumption is lowered. The method can also be used for processing baking-free bricks, aerated concrete and the like made of other waste residues, the economic benefits and the social benefits are obvious, and the method has good application prospects.

Description

technical field [0001] The invention relates to a high-efficiency autoclave curing method for fly ash free-burning bricks, in particular to a stepped temperature autoclave curing method which is composed of different autoclave heat preservation temperatures and curing times, and is also suitable for processing other waste slag-free bricks. Bricks and aerated concrete. It belongs to the field of building materials. Background technique [0002] Fly ash is an industrial waste slag discharged from coal-fired boilers in thermal power plants, which occupies a large amount of land and seriously pollutes the environment. [0003] The strength of autoclaved fly ash free-burning bricks depends on the type and quantity of hydration products produced in the production process. Under the conditions of the same ratio, autoclave curing temperature and curing time are the keys to affecting the type and quantity of hydration products. factors, among which the autoclave curing temperature ...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of excessive autoclave curing temperature, too long autoclave curing time, high energy consumption, overcooked and internal growth of unburned bricks, cracking and falling corners in the existing fly ash unburned brick autoclaved curing method. Low strength, poor frost resistance, etc., and provide a step temperature autoclaved curing method for fly ash unburned bricks

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