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Method for preparing foamed glass insulation board by coal ash

A technology of foam glass and fly ash, which is applied in the field of preparing foam glass insulation boards by using waste fly ash, can solve the problems of high temperature control accuracy, complicated preparation process, and low mechanical strength, and achieve adjustable porosity and simplified Process, the effect of reducing production costs

Inactive Publication Date: 2010-12-29
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of this method is complicated, the cost is high, the temperature control accuracy is high, and the mechanical strength of the product is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) First, put the fly ash and glass powder into the ball mill for dry grinding, use alumina ball stone as the grinding medium, control the mass ratio of the ball and the raw material to 2:1, the grinding time is 1h, and then pass 100 Mesh sieve, use permanent magnet to remove iron from the sieved fly ash, and then use electromagnetic to remove iron, so that Fe in fly ash 2 o 3 content of less than 0.5%;

[0019] 2) Next, select cerium oxide as foaming agent, get fly ash after removing iron, dry mill and sieve glass powder and cerium oxide with fly ash: glass powder: cerium oxide=30%: 60%: 10 The mass percent of % is put into a ball mill for dry grinding, using alumina ball stone as a grinding medium, controlling the mass ratio of balls and raw materials to be 2:1, and grinding for 1 hour to form a mixture;

[0020] 3) Then, the mixed material is packed into a steel mold of 200 mm * 150 mm * 20 mm, and pressed into a flat body at a pressure of 5 MPa by a manual press; ...

Embodiment 2

[0023] 1) First, put the fly ash and glass powder into the ball mill for dry grinding, use alumina ball stone as the grinding medium, control the mass ratio of the ball and the raw material to 2.3:1, and the grinding time is 1.6h. 100 mesh sieve, use permanent magnet to remove iron from the sieved fly ash, and then use electromagnetic to remove iron, so that Fe in fly ash 2 o 3 content of less than 0.5%;

[0024] 2) Next, select cerium oxide as blowing agent, get fly ash after iron removal, dry mill and sieve glass powder and cerium oxide with fly ash: glass powder: cerium oxide=40%: 50%: 10 The mass percent of % is put into the ball mill and dry-milled, utilizes alumina ball stone as grinding medium, the mass ratio of control ball and raw material is 2.3: 1, grinds 1.6h to form mixture;

[0025] 3) Then, the mixed material is packed into a steel mold of 200mm * 150mm * 20mm, and pressed into a flat green body at a pressure of 13MPa by a manual press;

[0026] 4) Finally, p...

Embodiment 3

[0028] 1) First, put fly ash and glass powder into a ball mill for dry grinding, use alumina ball stone as the grinding medium, control the mass ratio of balls and raw materials to 2.7:1, grind for 3 hours, and then pass 100 Mesh sieve, use permanent magnet to remove iron from the sieved fly ash, and then use electromagnetic to remove iron, so that Fe in fly ash 2 o 3 content of less than 0.5%;

[0029] 2) Next, select cerium oxide as foaming agent, get fly ash after removing iron, dry mill and sieve glass powder and cerium oxide with fly ash: glass powder: cerium oxide=30%: 50%: 20 % mass percent is put into a ball mill for dry grinding, using alumina ball stone as the grinding medium, controlling the mass ratio of the ball and the raw material to be 2.7:1, and grinding for 3 hours to form a mixture;

[0030] 3) Then, the mixed material is packed into a steel mold of 200mm * 150mm * 20mm, and pressed into a flat green body at a pressure of 20MPa by a manual press;

[0031]...

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Abstract

The invention relates to a method for preparing a foamed glass insulation board by coal ash. The coal ash and glass powder are respectively put into a ball mill for dry grinding and iron in the coal ash is removed, the coal ash after iron removal, glass powder after grinding and sieving and cerium oxide are dryly ground to form mixed material, the mixed 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, put into a silicon carbon rod resistancefurnace to be sintered, cooled and annealed, thus obtaining the foamed glass insulation board. The coal ash is used for preparing the foamed glass insulation board in the invention, which is not onlybeneficial for saving natural resources and reducing production cost but also beneficial for environmental protection. The coal ash can be smashed without a high power crusher and is even in mixing; meanwhile the coal ash contains a great amount of hollow cenospheres and melikaria and has low heat conductivity and thermostability characteristics. The cerium oxide is used as foaming agent to causefoaming temperature to be easily controlled, so as to simplify technology and reduce energy consumption, thus being beneficial for industrialized production.

Description

technical field [0001] The invention relates to the technical field of using waste to prepare glass, in particular to a method for preparing a foam glass insulation board by using waste fly ash. Background technique [0002] Foam glass is a kind of artificial porous material. It is a glass material filled with countless tiny, uniformly connected or closed pores inside. It has low density, high strength, small thermal conductivity, low thermal expansion coefficient, no water absorption, and no moisture absorption. and other excellent performance. As a new type of heat insulation material, it occupies an increasingly important position in the fields of high temperature heat insulation, low temperature heat preservation, moisture-proof engineering, and sound-absorbing engineering due to its durability, safety, reliability, and good chemical stability. (Tian Yingliang, Qu Peiyuan. Development history and trend of foam glass industry at home and abroad [J]. Glass and Enamel, 200...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C11/00B09B3/00
CPCC03C11/007
Inventor 黄剑锋曹丽云李颖华吴建鹏
Owner SHAANXI UNIV OF SCI & TECH
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