Pottery clay brick and preparation method thereof

Abstract

The invention belongs to the field of wall material production, and particularly relates to a pottery clay brick and a preparation method thereof, wherein the pottery clay brick raw material is tailings obtained after coal slime is sorted again through sorting equipment, and the tailings contain 60-72% of SiO2, 15-17% of Al2O3, 4-6% of Fe2O3, 0.5-2% of CaO, 0.5-2% of MgO and the balance of other elements, have the heat value of 1.8-2.1 MJ / kg, the plasticity index of 12-18 and the ignition loss of 4-10%, and have the granularity of smaller than 2 mm. According to the invention, the pottery claybrick is not added with any other auxiliary materials excluding the tailings, so that the performance of the pottery clay brick meets or even exceeds the national standard, the reutilization of the coal slime tailings is realized, and the limitation of pottery clay resources is overcome. The preparation process of the pottery clay brick is simple, energy-saving and environment-friendly.

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 usage 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 mining of clay resources, which will cause damage to cultivated land, farmland, and vegetation. Moreover, clay resources are depleting day by day, and the sintering of clay bricks is restricted by resources. Since the chemical composition of coal slime tailings is similar to that of clay, it is urgent to provide a clay brick that is not restricted by resources, saves energy, and has a simple preparation process. The problem

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