Terracotta brick and preparation method thereof

Abstract

The invention relates to a terracotta brick and a preparation method thereof. The terracotta brick is composed of 70 to 90 wt.% of tailing and 10 to 30 wt.% of clay. The tailing is directly obtained by resorting coal slurry by a sorting facility. The tailing comprises following components in percentage by weight: 62 to 76% of SiO2, 15 to 17% of Al2O3, 2 to 5% of Fe2O3, 0.5 to 2% of CaO, 0.5 to 2%of MgO, and the balance being other elements; the plasticity index of tailing is 12 to 18; the calorific value is 1.8 to 2.5 MJ/kg, and the loss on ignition is 3 to 10%. The provided terracotta brickmeets or even exceeds the national standards. The coal slurry tailing is reutilized, and the clay resource is saved. The preparation method is simple and the time is greatly saved.

Description

technical field [0001] The invention belongs to the field of wall material production, and in particular relates to a clay brick and a preparation method thereof. Background technique [0002] The annual amount of raw coal selected in my country is about 2.4 billion tons, and the total amount of slime produced is 200-300 million tons. Coal slime is composed of kaolin, argillaceous shale, clay, coal and other minerals, and after repeated flotation, soaking, stirring, and pressure filtration, the coal and mud are mutually adsorbed and completely muddy and difficult to use. At present, part of the coal slime is used for power generation in power plants, and part of the coal slime is recycled by using existing equipment and processes exhaustively, but the calorific value of the tailings is still 7-8MJ / kg. These tailings are used for power generation in power plants, and the calorific value is too low to be directly used; open-air stacking pollutes the environment, and landfills...

AI Technical Summary

Problems solved by technology

These tailings are used for power generation in power plants, and the calorific value is too low to be directly used; open-air stacking pollutes the environment, and landfills waste resources. If the brick factory prepares fired bricks, it still contains a large amount of calorific value that exceeds the brick-making requirements by many times. Sintered at 1150°C, the shrinkage rate is large, which can lead to the deformation of the stacking height during sintering, and the collapse of the brick body, and it is impossible to obtain clay bricks that meet the performance of the national standard.

If it is used as an additive to prepare clay bricks, its amount is limited, accounting for no more than 30%, and there is still a large amount of coal slime that cannot be used

[0003] Clay bricks are mainly used in city squares, municipal engineering, garden streets, high-end buildings, etc. Traditional clay bricks usually use high-quality clay or even purple sand clay for firing, which requires The mining of clay resources will cause the destruction of cultivated land, farmland and vegetation. Moreover, the clay resources are becoming increasingly exhausted, and the sintering of clay bricks is subject to the corresponding constraints of resources.

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