Preparation method, production system and application of foamed ceramic and foamed ceramic

Abstract

The invention relates to the field of foamed ceramics, and particularly provides a preparation method, production system and application of a foamed ceramic and the foamed ceramic. The preparation method of the foamed ceramic comprises the steps that firstly, foamed ceramic powder is subjected to biscuit firing and then fired to obtain the foamed ceramic. The method is scientific and reasonable inprocess, structural water, combined water, organic matter, carbonate, sulfate and other substances in the powder can be decomposed in the biscuit firing stage, gas which is not conducive to the production of the foamed ceramic is fully discharged, the firing process of the material can be quickly completed, the method is beneficial to increasing the firing speed, increasing the yield and ensuringthe product quality, and moreover, the thicker product can be produced.

Description

technical field [0001] The invention relates to the field of foamed ceramics, in particular to a method for preparing foamed ceramics and a production system thereof, foamed ceramics and applications thereof. Background technique [0002] The firing of lightweight foamed ceramic partition wall panels in roller kilns has become an important way for the production process of foamed ceramics. The traditional manufacturing of foamed ceramic wall panels involves filling granular powder into the kiln with sagger setters and firing them. This manufacturing method has the following characteristics: [0003] First, the raw materials used are mostly mine tailings, river silt, industrial tailings and domestic waste treatment materials, etc., and the ignition loss of such raw materials is relatively large (namely structural water, bound water, organic matter, carbonate, sulfuric acid Decomposition of salt, etc.), generally more than 10% (such as red mud, coal gangue, fly ash, etc.), th...

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Problems solved by technology

[0003] First, the raw materials used are mostly mine tailings, river silt, industrial tailings and domestic waste treatment materials, etc., and the ignition loss of such raw materials is relatively large (namely structural water, bound water, organic matter, carbonate, sulfuric acid Decomposition of salt, etc.), generally more than 10% (such as red mud, coal gangue, fly ash, etc.), the exhaust volume in the firing process is relatively large; second, the heat transfer of loose powder mainly depends on convection and radiation Complete, compared with the ceramic tile body, the thickness of the foamed ceramic powder is higher (the thickness of the stack is 30-60mm), and the exhaust speed is slower, so a longer exhaust time is required; third, foaming The ceramic powder needs to be fully exhausted in the preheating section. If the upper surface powder is melted and sealed at this stage, incomplete exhaust will cause harmful gases (gases not required for foaming) to be exhausted, which will lead to air bubbles produced, resulting in stress concentration and fracture at the air bubbles after the product leaves the kiln

[0004] Therefore, in the traditional firing process, enough time must be provided to decompose the exhaust gas in the preheating section of the roller kiln, but this is not conducive to speeding up the kiln speed, increasing output and firing thicker products (such as 120mm, 100mm, etc.)

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