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Method for preparing foamed ceramic insulation board by coal ash

A technology of foam ceramics and fly ash, which is applied in the field of waste materials to prepare building insulation materials, can solve the problems of difficulty in continuously manufacturing large-sized porous foam ceramics, complicated process, and limited use, and achieves environmental protection, simple preparation process, The effect of adjustable porosity

Inactive Publication Date: 2009-12-09
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods are complicated in process and high in cost, and it is not easy to continuously produce large-sized porous ceramic foams, which limits their use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] 1) First, put fly ash and potassium feldspar into a ball mill for dry grinding respectively, use alumina ball stone as grinding medium, control the mass ratio of grinding ball and raw material to be 2: 1, grind 1h respectively and then pass 100 meshes respectively. The sieved fly ash is iron removed by permanent magnet, and then electromagnetic iron removal is used to remove Fe in the fly ash. 2 O 3 content of less than 0.5%;

[0021] 2) secondly, select cerium oxide as foaming agent, get fly ash after iron removal, dry grinding and sieve potassium feldspar, kaolin and cerium oxide by fly ash: potassium feldspar: kaolin: cerium oxide=30% : 35%: 10%: 25% by mass percentage to make a mixture and put the mixture into a ball mill for wet grinding and mixing, using alumina balls as grinding media to control the mass ratio of grinding balls, mixture and water 2:1:0.8, grinding for 1.5h to form a mixed slurry;

[0022] 3) Then, the mixed slurry is dried by a pressure type s...

Embodiment 2

[0025] 1) First, put fly ash and potassium feldspar into a ball mill for dry grinding respectively, utilize alumina ball stone as grinding medium, control the mass ratio of grinding ball and raw material to be 3:1, grind 3h respectively and then pass 100 meshes respectively. The sieved fly ash is iron removed by permanent magnet, and then electromagnetic iron removal is used to remove Fe in the fly ash. 2 O 3 content of less than 0.5%;

[0026] 2) secondly, select cerium oxide as foaming agent, get fly ash after iron removal, dry grinding and sieve potassium feldspar, kaolin and cerium oxide by fly ash: potassium feldspar: kaolin: cerium oxide=40% : 30%: 10%: 20% by mass percentage to make a mixture and put the mixture into a ball mill for wet grinding and mixing, using alumina balls as grinding media to control the mass ratio of grinding balls, mixture and water 2.3:1:0.8, grind for 3h to form mixed slurry;

[0027] 3) Then, the mixed slurry is dried by a pressure type spr...

Embodiment 3

[0030] 1) First, put fly ash and potassium feldspar into a ball mill respectively for dry grinding, use alumina balls as grinding medium, control the mass ratio of grinding balls to raw materials to be 2.5:1, grind 2h respectively and then pass 100 meshes respectively. The sieved fly ash is iron removed by permanent magnet, and then electromagnetic iron removal is used to remove Fe in the fly ash. 2 O 3 content of less than 0.5%;

[0031] 2) secondly, select cerium oxide as foaming agent, get fly ash after iron removal, dry grinding and sieve potassium feldspar, kaolin and cerium oxide by fly ash: potassium feldspar: kaolin: cerium oxide=30% : 40%: 10%: 20% by mass percentage to make a mixture and put the mixture into a ball mill for wet grinding and mixing, using alumina balls as grinding media to control the mass ratio of grinding balls, mixture and water 2.1:1:0.8, grinding for 0.5h to form a mixed slurry;

[0032] 3) Then, the mixed slurry is dried by a pressure type sp...

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Abstract

The invention relates to a method for preparing a foamed ceramic insulation board by coal ash. The coal ash and potash feldspar are respectively put into a ball mill for dry grinding and then sieved by a 1000-mesh sieve, iron in the sieved coal ash is removed, the coal ash after iron removal, potash feldspar after dry grinding and sieving, kaolin and cerium oxide are put into the ball mill for wet grinding to be even, so as to form mixed slurry; the mixed slurry is dried by a pressure GLZ, the dried powder material is put into a steel mould to be pressed into a flat green body; and the pressed green body is put into an aluminum oxide sagger which is evenly spread with aluminium oxide powder at the bottom, sintered in a silicon carbon rod resistance furnace and cooled naturally, thus obtaining the foamed ceramic insulation board for building. The coal ash is used for preparing the foamed ceramic insulation board, which is not only beneficial for saving natural resources and reducing production cost but also beneficial for environmental protection. The coal ash contains a great amount of hollow cenospheres and melikaria and has low heat conductivity and thermostability characteristic. The cerium oxide is used as foaming agent, which can lower sintering temperature of the foamed ceramic and reduce energy consumption.

Description

technical field [0001] The invention relates to the technical field of using waste materials to prepare building thermal insulation materials, in particular to a method for preparing foam ceramic thermal insulation boards by using waste fly ash. Background technique [0002] With the progress of society and the development of industry, people's demand for energy continues to increase, but energy resources are extremely limited, and the gap is constantly increasing. The development of new clean energy and energy conservation are necessary steps to achieve sustainable economic development. my country's building energy consumption accounts for about 28% of the total social energy consumption, and, with the continuous warming of real estate, the proportion is also rising year by year (Yin Zhonghai. The application of thermal insulation materials in construction projects [J]. Hubei Institute of Education Journal , 2005, 22(2):72-73). Therefore, we must pay attention to the produc...

Claims

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Application Information

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IPC IPC(8): C04B38/02B09B3/00B28B3/00B28B7/00
Inventor 黄剑锋曹丽云李颖华吴建鹏
Owner SHAANXI UNIV OF SCI & TECH
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