Preparation process of thermal insulation exterior wall brick

Abstract

The invention provides a preparation process for thermal insulation exterior wall bricks, which belongs to the technical field of thermal insulation exterior wall bricks, comprising: mixing dry sludge, coal gangue, fly ash, perlite, borax, sodium hydroxide, and potassium hydroxide to 100 ‑200 mesh to obtain a mixture; add water to the mixture and stir evenly, age, press and shape to obtain bricks; dry and roast the bricks to obtain thermal insulation exterior wall bricks. The dried sludge is obtained by the following method: mixing and dehydrating municipal sludge with modified basalt fiber and polyacrylamide to obtain a dehydrated cake; crushing and drying the dehydrated cake to obtain dried sludge; Basalt fibers are modified with dopamine and diaminophosphoric acid. Due to the use of the above dried sludge, the thermal insulation exterior wall bricks produced by the preparation process of the present invention have more closed holes, lower thermal conductivity, better thermal insulation, higher compressive strength and frost resistance .

Description

technical field [0001] The invention belongs to the technical field of thermal insulation exterior wall bricks, and in particular relates to a preparation process of thermal insulation exterior wall bricks. Background technique [0002] With the continuous advancement of urbanization and the increase of urban population, my country's urban domestic sewage sludge continues to increase. The sludge contains pathogens and bacteria, and when it is piled up, it will ferment and emit unpleasant and harmful odors that will endanger the health of workers and destroy the living environment. Inorganic salts in sludge enter the soil with water and soil loss, which will enhance soil electrical conductivity, damage plant nutrient absorption and even damage plant roots. Nutrients such as nitrogen and phosphorus may also cause eutrophication of water bodies. Heavy metals in sludge, such as Cd, Cr, Mg, Zn, are easily absorbed by plants and animals and accumulate in human and animal bodies th...

AI Technical Summary

Problems solved by technology

At present, there are two main ways to prepare building materials from sludge. One is to use the sludge after incineration, and the other is to crush the dried sludge and directly add it to the mixture to prepare building materials. It is difficult to disperse wet sludge and use it in the manufacture of building materials. less

At present, the construction industry urgently needs new thermal insulation wall materials to replace clay bricks. The plasticity of sludge incineration ash is poor, and the effect of improving the thermal insulation performance of sintered wall materials is not obvious, so it is not suitable for the preparation of sintered thermal insulation bricks.

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