Red mud lightweight thermal-insulation ceramic bricks as well as application and preparation method thereof

Abstract

The invention provides red mud lightweight thermal-insulation ceramic bricks as well as application and a preparation method thereof. The ceramic bricks are prepared from the following raw materials: red mud, quartz, feldspar, kaolin, gypsum, a foaming agent and water; the red mud accounts for 70 percent of the total weight of the red mud, the quartz, the feldspar, the kaolin and the gypsum according to weight percent; the foaming agent is prepared from aluminum powder and solid sodium hydroxide; the red mud is Bayer-process red mud. The volume density of the ceramic bricks is less than or equal to 400kg / m<3>, the compressive strength is 0.5MPa or higher, the water absorption rate is 21 percent or lower, the porosity is 75 percent to 80.4 percent and the heat conductivity is less than 0.073W / m.DEG C; the non-combustion property belongs to a grade A1 building sheet material. The ceramic bricks provided by the invention are used for external thermal insulation of external walls of high-rise buildings, have good working performance and are convenient to cut and drill; a lot of the red mud can be utilized so that the problems that the stacking amount of the red mud is great and the environment is polluted are solved; secondary utilization of wastes is realized, so that the ceramic bricks have remarkable economical efficiency and environmental performance.

Description

Technical field [0001] The invention relates to a new type of red mud-based building thermal insulation material, in particular to a large-volume Bayer process red mud lightweight thermal insulation ceramic brick for external thermal insulation of high-rise buildings and a preparation method thereof. Background technique [0002] Red mud is the solid waste remaining after alumina is produced from bauxite through a series of physical and chemical reaction processes. It is the main solid waste residue in the alumina industry. Due to differences in ore quality, production methods and technical levels, about 1.0 to 1.8 tons of red mud are discharged for every lt alumina produced. It is estimated that the world’s alumina industry produces more than 6×10 red mud every year 7 t. In 2009, the annual discharge of red mud in my country reached 30 million tons, and the cumulative accumulation of red mud reached more than 300 million tons; in 2015, the cumulative red mud stockpiled reached 3...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problems of serious red mud stacking pollution, difficulty in large-scale treatment, and serious gaps in thermal insulation materials in the building materials industry in the above-mentioned prior art; to propose a large-volume Bayer process red mud for external insulation of high-rise building exterior walls Lightweight thermal insulation ceramic brick and preparation method thereof,

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