Process method for reducing shrinkage rate of coal gangue-based insulating bricks in roasting process

Abstract

The invention discloses a technological method for reducing the shrinkage rate of coal gangue-based insulating bricks in a roasting process, and relates to the technical field of building materials. The technological method specifically comprises the following steps of: 1) preparing a nano chitin dispersion liquid from shrimp shells; 2) adding multiwalled carbon nanotubes into a nanocellulose suspension, and adding alumina fibers and mullite fibers to obtain a fiber dispersion liquid; 3) uniformly mixing aluminum oxide sol and silicon dioxide sol to obtain composite sol; and 4) uniformly mixing the products obtained in the steps 1) and 2), drying an obtained mixture to obtain composite fibers, drying and screening coal gangue, fly ash and engineering spoil, adding water, adding the composite fibers and the composite sol, performing aging, adding expanded perlite, and carrying out compression molding, drying, and roasting. According to the production process provided by the invention, the volume shrinkage rate of the insulating bricks can be effectively reduced, and the deformation of the insulating bricks is reduced, so that the insulating bricks are not easy to crack in a high-temperature roasting process, and the performance of the insulating bricks is improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a process for reducing the shrinkage rate of coal gangue-based thermal insulation bricks during the roasting process. Background technique [0002] With the continuous development and progress of society, people have higher and higher requirements for the use and function of buildings, and building energy consumption has received great attention. Studies have shown that in the total heat loss of a building, the heat lost through the outer wall accounts for 35-49%, so new thermal insulation materials with good thermal insulation performance are the development trend of the construction industry. Coal gangue is a kind of solid waste produced in the process of coal mining and coal washing. According to incomplete statistics, the cumulative stacking volume of coal gangue has reached more than 5 billion tons, and the annual discharge is increasing by 100 million...

AI Technical Summary

Problems solved by technology

During the firing process of insulation bricks, various chemical components on the surface and inside of insulation bricks liquefy under the action of high temperature to form a liquid phase, which moves inside the insulation bricks under its own gravity, liquid phase surface tension and capillary action, and begins to Encapsulate solid powder particles and expanded perlite and generate new crystal phases. With the increasing liquid phase formation, the crystal phase grows completely, and the expanded perlite is completely encapsulated by the newly generated crystal phase, forming closed pores, which reduces the thermal conductivity. The thermal insulation of the insulation brick is improved, and the formation of more liquid phases increases the degree of reaction, so that the compressive strength of the insulation brick is improved, and the volume shrinkage rate increases, but with the increase of the volume shrinkage rate, the product's The volume also changes accordingly, which makes the product prone to cracking