Lightweight high-strength ceramsite and preparation method thereof

Abstract

The invention provides a lightweight high-strength ceramsite and a preparation method thereof. The lightweight high-strength ceramsite comprises a mixed material and a pore forming agent at a mass ratio of 100:1.5-3; the mixed material comprises, by weight, 5 to 15 parts of kaolin tailing, 55 to 65 parts of coal gangue, and 20 to 40 parts of fly ash. The preparation method comprises following steps: kaolin tailing, coal gangue, and fly ash are mixed, and an obtained mixture is subjected to grinding, and sieving using a sieve of 0.16mm; the pore forming agent is added, an obtained product is mixed uniformly, water is added, and an obtained material is stirred and is subjected to moulding until desired size is achieved so as to obtain a ceramsite raw batch; the ceramsite raw batch is delivered into a high temperature furnace for 10 to 20min of thermal insulation at 1050 DEG C so as to finish sintering. According to the preparation method, the raw materials are all wastes; waste utilization rate is as high as 100%; and the lightweight high-strength ceramsite can be obtained via sintering at low temperature.

Description

technical field [0001] The invention relates to a light-weight high-strength ceramsite and a preparation process of the light-weight high-strength ceramsite. Background technique [0002] Ceramsite is a kind of artificial lightweight coarse aggregate, which is usually processed at a certain temperature (generally high temperature), so that the raw materials undergo a chemical reaction to release gas, produce pores and expand, and form a light porous, spherical shape with a certain strength after cooling. or oval silicate spheres. The internal structure of ceramsite is characterized by fine and dense honeycomb micropores. Ceramsite has excellent properties, such as low density, high cylinder compressive strength, high porosity, high softening coefficient, good frost resistance, and excellent alkali-aggregate reactivity. Especially because of its low density, internal porosity, uniform shape and composition, and certain strength and firmness, ceramsite has multifunctional ch...

AI Technical Summary

Problems solved by technology

[0003] Kaolin tailings, coal gangue and fly ash are three kinds of wastes with large emissions in my country at present. For a long time, the reutilization rate of kaolin tailings and coal gangue is low, and the process is complicated, the cost is high, and the application range is narrow. Solid waste is still piled up for a long time, which not only occupies a large amount of land, but also has an extremely bad impact on the atmospheric environment and groundwater resources. Fly ash is mainly used as an admixture in concrete with simple and low added value

[0004] Existing ceramsites mostly use single raw materials such as clay, silt, coal gangue, fly ash or shale as the main raw materials to fire ceramsites. Some of these ceramsites emphasize light weight, but their strength is extremely low, usually lower than 2.0MPa ; Some ceramsite products have extremely high strength (strength above 10MPa), but the bulk density is too high (above 1000g / cm3); some ceramsite products are mixed with chemical pure substances, and the waste rate is not high, resulting in high cost; The sintering temperature of the product is relatively high, usually above 1200°C

Images