Sintered brick and preparation method thereof

Abstract

The invention belongs to the field of wall material production, and particularly relates to a sintered brick and a preparation method thereof, wherein the sintered brick raw material is composed of tailings and a preset substance, the preset substance is any one selected from clay, shale powder and fly ash, the mass percent of the tailings is 70-90%, the mass percent of the preset substance is 10-30%, the tailings are directly obtained after coal slime is sorted again through sorting equipment, and the tailings comprise, by mass, 45-65% of SiO2, 18-25% of Al2O3, 3-5% of Fe2O3, 3-5% of CaO, 1-3% of MgO and the balance of other elements, and have the plasticity index of 11-15 and the calorific value of 1.8-2.5 MJ / kg. According to the total internal heat sintered standard brick, energy is saved, the performance of the total internal heat sintered standard brick meets or even exceeds the national standard, and reutilization of coal slime tailings and shale is achieved. The preparation method of the sintered brick is simple in process, and the time cost is greatly saved.

Description

technical field [0001] The invention belongs to the field of wall material production, and in particular relates to a fired brick and a preparation method thereof. Background technique [0002] Coal slime is one of the solid wastes with the largest discharge in my country at present. The reuse of coal slime resources is an inevitable choice for my country's coal-based energy structure, and it is also one of the important measures to implement sustainable development strategies. The amount of raw coal selected in my country is about 2.4 billion tons every year, and the amount of coal slime produced is 200-300 million tons. Coal slime is composed of minerals such as kaolin, argillaceous shale, clay, coal, etc. 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 or coal gangue power plants, and part ...

AI Technical Summary

Problems solved by technology

The coal slime ash content of the sintered hollow bricks mentioned in the literature is 59.48%. Even if the gangue is mixed with the calorific value of the gangue itself, the calorific value should be between 7.8-8.3MJ / kg (1800-2000 kcal). The calorific value suitable for sintered bricks is below 2.5MJ / kg, and the calorific value of its coal slime exceeds 4 times the brick-making requirements, resulting in a large amount of shrinkage during the calcination process, resulting in deformation of the stacking height, and brick body deformation and collapse

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