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Method for preparing hollow alumina sphere bricks by utilizing pore forming substance

A technology of hollow spherical bricks and pore-forming agents, which is applied in the field of refractory materials, can solve the problems of not being able to form near the final size, limited use range, and low forming efficiency, and achieve high strength, increase heat insulation performance, and enhance bonding. Effect

Active Publication Date: 2018-12-07
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is complex, the slurry is solidified and demoulded, the molding efficiency is low, it cannot be molded to near-final size, the strength is limited, and the scope of use is limited

Method used

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  • Method for preparing hollow alumina sphere bricks by utilizing pore forming substance
  • Method for preparing hollow alumina sphere bricks by utilizing pore forming substance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of method that utilizes pore-forming agent to prepare alumina hollow ball brick: first make 36% Al 2 o 3 Micropowder, 10% clay fine powder, 2% silicon micropowder three kinds of micropowder are pre-mixed as matrix mixed powder;

[0031] The pore-forming agent is spherical PS, three sizes and the addition ratio is 50um, 33%; 100um, 35%; 150um, 32%; the amount of pore-forming agent added is 6% of the weight of the mixed powder and the added amount is the weight of the mixed powder The 7% silica sol solution is fully mixed and moistened, and then the mixed powder is added to wrap and granulate;

[0032] Fully mix 52% alumina hollow spheres with 3% CMC:PVA=1:5 aqueous solution based on the weight of alumina hollow spheres, then add the prepared packaged granules for mixing, and prepare each A shaped product of the desired size is dried at 120°C and fired at 1650°C for 8 hours.

[0033] At the same time, a comparative example is also used in this example, the compa...

Embodiment 2

[0036] A kind of method that utilizes pore-forming agent to prepare alumina hollow ball brick; First 20% Al 2 o 3 Micropowder, 24% clay fine powder, 1% silicon micropowder three kinds of micropowder are pre-mixed as matrix mixed powder;

[0037] Spherical PMMA is selected as the pore-forming agent, three sizes and the addition ratio are 50um, 30%; 100um, 40%; The 11% silica sol solution is fully mixed and moistened, and then the mixed powder is added to wrap and granulate;

[0038] Fully mix 55% alumina hollow spheres and 2.5% CMC:PVA=1:1 aqueous solution of the weight of alumina hollow spheres, then add the prepared packaged granules for mixing, and use vibration and pressure to prepare each A shaped product of the desired size is dried at 115°C and fired at 1700°C for 6 hours;

[0039] At the same time, a comparative example is also used in this example, the comparative example is the scheme in the patent CN 201110023753.0 "Alumina Hollow Sphere Lightweight Heat Insulatio...

Embodiment 3

[0042] A kind of method that utilizes pore-forming agent to prepare alumina hollow ball brick; First 31% Al 2 o 3 Micropowder, 18% clay fine powder, 4% silicon micropowder three kinds of micropowder are pre-mixed as matrix mixed powder;

[0043] The pore-forming agent is spherical PS: PMMA=1:1, three sizes and the addition ratio are 50um, 25%; 100um, 40%; 150um, 35%; Add 9% silica sol solution in an amount equal to the weight of the mixed powder for full mixing and wetting, then add the mixed powder for encapsulation and granulation;

[0044] Fully mix 47% alumina hollow spheres and 4% PVA aqueous solution with an amount equal to the weight of alumina hollow spheres, then add the prepared wrapped granules for mixing, and prepare various shapes of required sizes by means of vibration and pressure The finished product is dried at 110°C and fired at 1680°C for 7 hours;

[0045] At the same time, a comparative example is also used in this example, which is the scheme in the pat...

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Abstract

The invention relates to the technical field of refractory matters and relates to a method for preparing hollow alumina sphere bricks by utilizing a pore forming substance. The method for preparing the hollow alumina sphere bricks by utilizing the pore forming substance comprises the following steps: premixing Al2O3 micro powder, clay fine powder and silica powder to serve as a matrix part; fullystirring a spherical pore forming substance of 50-150 microns with a silica sol solution, fully wetting the silica sol solution, and attaching onto the surface of the spherical pore forming substance;performing mixing granulation on the mixed powder of three kinds of micro powder serving as the matrix and the spherical pore forming substance attached with the silica sol solution so as to obtain coating particles obtained by coating the mixed powder with the spherical pore forming substance; and fully mixing the hollow alumina spheres and a binding agent, adding the coating particles for mixing again, and finally adopting a vibration pressurization manner to prepare various set products of needed sizes, drying, maintaining the heat, and firing, thereby obtaining the hollow alumina sphere bricks. The hollow alumina sphere brick disclosed by the invention has the characteristics of being excellent in high temperature creep resistance and excellent in thermal shock resistance.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a method for preparing alumina hollow spherical bricks by using a pore-forming agent. Background technique [0002] Energy is increasingly tight and environmental protection is becoming increasingly strict. As an indispensable part of high-temperature industry, refractory materials have been proposed for some key properties such as low thermal conductivity, high refractoriness, good volume stability at high temperature, and good thermal shock resistance. New requirements to meet the needs of light-weight high-temperature kilns: light-weight high-alumina bricks, light-weight mullite bricks, light-weight clay bricks, and light-weight silica bricks prepared by burning-out method or foaming method in the domestic market etc., have been widely used in the backing layer and heat insulation layer of industrial kilns; but the working face bricks used in high-temperature or u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B38/08C04B35/101C04B35/622
CPCC04B35/101C04B35/622C04B38/067C04B38/08C04B2235/3418C04B2235/3463C04B2235/349C04B2235/528C04B2235/77C04B2235/96C04B2235/9607C04B38/0067
Inventor 王晗方旭冯志源李坚强张永治尹洪基范沐旭李坤鹏赵志龙
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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