Coal ash thermal insulating material and preparation method thereof

Abstract

The invention discloses a coal ash thermal insulating material and a preparation method of the coal ash thermal insulating material, belongs to the field of building material, and relates to a thermal insulating material and a preparation method of the thermal insulating material. The coal ash thermal insulating material is prepared by expanding and sintering coal ash and soda ash serving as raw material. The preparation method comprises the following steps of: mixing and stirring the coal ash and the soda ash in proportion; preheating the mixture to 600-1000 DEG C in a rotary kiln, and introducing the preheated mixture into a temperature resistant distributor; uniformly distributing a layer of material from the upper part of a tunnel kiln to a kiln car located inside the high-temperature area of the tunnel kiln by using the distributor, sintering and expanding the material at 1200-1250 DEG C so that the material is bonded together; when the material inside the tunnel kiln is sintered and formed to the prescribed thickness, sending the material and the kiln car out of the tunnel kiln, distributing, sintering, expanding and forming the material inside next kiln car, and repeatedly carrying out the operations; and introducing the material sent out of the kiln car into an insulating kiln, carrying out thermal insulation for 24 hours, then reducing the temperature to be below 300 DEG C, and cooling, cutting and forming. The preparation method disclosed by the invention has the advantages of controllable kiln temperature, low production cost, and good thermal insulation effect; moreover, place and equipment are saved.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a thermal insulation material and a preparation method thereof. Background technique [0002] Fly ash blocks are made of fly ash into balls, dried and puffed into ceramsite at high temperature in a rotary kiln, then added to cement and stirred, mechanically formed, and artificially maintained. In the process of producing fly ash puffing in the rotary kiln, it is difficult to control the kiln temperature due to different materials. Low kiln temperature is easy to produce raw materials, and high kiln temperature is easy to stick to the kiln and affect production. And adding cement to produce blocks, the production cost is high, the labor intensity of workers is high, the maintenance period of cement products is long, the site is large, and it is limited by the temperature season. Contents of the invention [0003] The object of the present invention is to provide a fly ash therma...

AI Technical Summary

Problems solved by technology

In the process of producing fly ash puffing in the rotary kiln, it is difficult to control the kiln temperature due to different materials. Low kiln temperature is easy to produce raw materials, and high kiln temperature is easy to stick to the kiln and affect production.

Moreover, adding cement to produce blocks requires high production costs, high labor intensity, long maintenance period for cement products, large site, and limited by temperature and seasons.

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