Clay brick and preparation method thereof

Abstract

The invention belongs to the field of wall material production, and particularly relates to a clay brick and a preparation method thereof. The clay brick is composed of the following raw materials, inpercentages by mass: 70-90% of tailings and 10-30% of fly ash; the tailings is directly obtained by performing sorting on sorted coal slime by sorting equipment, and the tailings comprises the following components, in percentages by mass: 62-76% of SiO2, 15-17% of Al2O3, 2-5% of Fe2O3, 0.5-2% of CaO, 0.5%-2% of MgO, and rest is other elements; and the tailings has a plasticity index of 12-18 anda calorific value of 1.8-2.1 MJ / kg. According to the method provided by the invention, full internal thermal sintering is used to prepare the clay brick, the energy sources are saved, the performancemeets or even exceeds national standards in China, and reuse of the coal slime tailings and the fly ash is realized; and the preparation method of the clay brick has a simple process, and the time costs are 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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