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Method for preparing foamed ceramic plate by taking pulverized fuel ash as raw material via microwave sintering

A foamed ceramic plate and microwave sintering technology, which is applied to ceramic products, other household utensils, household utensils, etc., can solve the problems of long sintering period, high sintering temperature, and uneven sintering, so as to save ceramic raw materials and sinter Short cycle, satisfying the effect of heat preservation

Active Publication Date: 2014-12-17
MONALISA GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent application 201210077995.2 discloses a method for preparing a closed-cell foamed ceramic insulation board using waste fly ash as the main raw material. The sintering cycle is more than 10 hours, the firing cycle is long, and the sintering is easy to be uneven locally
Due to the low thermal conductivity of the porous ceramic material itself, sintering by conventional methods will easily lead to uneven sintering of the material locally, and the sintering time is too long, resulting in a great waste of energy.

Method used

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  • Method for preparing foamed ceramic plate by taking pulverized fuel ash as raw material via microwave sintering

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preparation example Construction

[0021] The preparation method of foamed ceramic plate of the present invention comprises the steps:

[0022] (1) The above-mentioned ceramic raw materials are put into balls according to the formula ingredients and mixed evenly by wet ball milling. The ball milling medium can be medium aluminum ceramic balls or corundum ceramic balls. The ball milling speed can be 11-14 rpm, and the ball milling time can be 8-15 hours. ;

[0023] (2) Spray-drying to make powder, after stale for 24 hours, enter the mold and lay flat to make powder green body;

[0024] (3) The powder green body is directly microwave-heated to 1080-1150°C for microwave sintering, or preheated to 300-800°C, and then microwave-heated to 1080-1150°C for microwave sintering to form a lightweight foam with uniform distribution of closed pores ceramic plate;

[0025] (4) After cold processing such as cutting, the finished product of the required specification is made.

[0026] fly ash

[0027] The main source of th...

Embodiment 1

[0044] Foamed ceramic board formula (percentage by weight): fly ash 70%, low-temperature waste frit 10%, waste glass 4.5%, talc 8%, clay 7%, 2000 mesh silicon carbide micropowder 0.3%, debonding agent 0.2%;

[0045] The preparation method comprises the following steps:

[0046] (1) above-mentioned raw material carries out wet ball milling, and ball milling medium is corundum ceramic ball, and ball milling speed is 13 revs / min, and ball milling time is 9. hours;

[0047] (2) The slurry obtained by ball milling is made into powder by spray drying (the particle size is 20-80 mesh), and it is placed into a mold after being stale for 24 hours;

[0048] (3) Microwave heating to 1080-1150°C for sintering (microwave power: 30kW), firing cycle: 120min, high temperature zone holding time: 10min;

[0049] (4) Finished products of required specifications are made by cold processing such as cutting;

[0050] The foamed ceramic plate prepared in this embodiment has a bulk density of 0.28g...

Embodiment 2～4

[0052] The preparation method of embodiment 2~4 is the same as embodiment 1, but the formula (weight percentage) used in each embodiment sees the following table 1:

[0053] Table 1

[0054]

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Abstract

The invention relates to a method for preparing a foamed ceramic plate by taking pulverized fuel ash as a raw material via microwave sintering. The method comprises the following steps: carrying out burdening on the following raw materials by weight percent: 70% to 90% of pulverized fuel ash, 0% to 20% of low-temperature waste frits, 0% to 20% of waste glass, 0% to 8% of soapstone, 0% to 8% of clay, 0% to 1% of microwave absorbing material and 0.2% to 0.6% of dispergator, wherein the sum of the weight percent of all the components is 100%; carrying out ball grinding and spray granulation and putting the mixture into a mould to form a green body; and carrying out the microwave sintering on the green body within a firing period of 100 to 160 minutes at a temperature of 1080 DEG C to 1150 DEG C and under the microwave power of 20kW to 50kW and then carrying out heat preservation for 6 to 12 minutes so as to obtain the foamed ceramic plate.

Description

technical field [0001] The invention belongs to the field of resource utilization of inorganic non-metallic material solid waste, and in particular relates to a method for preparing a foamed ceramic plate by microwave sintering of power plant fly ash. Background technique [0002] In recent years, the fire accidents caused by thermal insulation materials in large buildings in China have received strong social reactions. The state has clearly stipulated that "the external thermal insulation materials of civil buildings shall adopt Class A materials with combustion performance". At present, most of the thermal insulation materials used in China for building exterior walls are organic materials such as polyurethane, polystyrene, phenolic resin, etc., and the best combustion performance can only reach Class B, which cannot meet the requirements of Class A for fire resistance. [0003] Foamed ceramics is a kind of ceramic material that uses refractory raw materials as aggregates,...

Claims

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Application Information

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IPC IPC(8): C04B38/02
Inventor 刘一军潘利敏汪庆刚闫振华谢志军赵勇杨晓峰董军乐
Owner MONALISA GRP CO LTD
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