Difficult-to-crack anorthite lightweight refractory material and preparation method thereof

A light-weight refractory material and anorthite technology, applied in the field of refractory materials, can solve the problems of high rejection rate of finished products, prone to cracks, uncontrollable bulk density, etc., and achieve the effect of good thermal insulation performance and not easy to crack

Inactive Publication Date: 2020-11-27
山东鲁阳浩特高技术纤维有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing anorthite lightweight refractory bricks not only have the problem of uncontrollable volume density, but also need to further improve the thermal insulation effect
Moreover, the existing methods for preparing lightweight anorthite refractory bricks are prone to cracks at the bottom of the anorthite refractory bricks, which in turn affects the performance of the final product, and the scrap rate of the finished product is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The invention provides a method for preparing an anorthite lightweight refractory material that is not prone to cracks, comprising the following steps:

[0023] A) In terms of mass fraction, 48-55% coal gangue, 3-6% kyanite, 4.5-6.5% pyrophyllite, 10-14.5% refractory clay, 9.5-15.5% calcium carbonate, 5-10% High alumina cement, 4-8% coagulant, 1-5% zirconium-containing fiber and 3-8% foaming agent are mixed, stirred evenly, and castable is obtained;

[0024] B) pouring the castable into a mold, drying and firing after demoulding to obtain an anorthite lightweight refractory material;

[0025] The bottom of the mold is cushioned with a water-absorbing device, and the surface of the water-absorbing device is coated with a water-absorbing paint; during the drying process, the bottom of the molded body after demoulding is cushioned with a water-absorbing device used for casting.

[0026] In the present invention, 48-55% of coal gangue, 3-6% of kyanite and 4.5-6.5% of pyrop...

Embodiment 1

[0061] Add 54kg of coal gangue powder of 300 mesh, 6kg of pyrophyllite powder of 180 mesh and 5kg of kyanite powder of 180 mesh into a ball mill for ball milling for 6 hours until the mesh reaches 2000 mesh.

[0062] The slurry that has been ball milled is released and placed in the storage tank to keep stirring for later use.

[0063] For one stirring, 8 kg of ball mill slurry, 1.12 kg of 300-mesh refractory clay and 1.2 kg of 550-mesh calcium carbonate are taken from the storage tank and stirred for 15 minutes at the same time, and the temperature of the slurry is controlled at 26 °C;

[0064] Secondary stirring: add cement 400g, coagulant 480g, zirconium-containing fiber 80g and other auxiliary materials at the same time and stir for 16 minutes. After the stirring is completed, add foaming agent and stir for 30 seconds, let it fully stir, so that the air bubbles are more evenly distributed in the slurry.

[0065] Quantitative pouring: 6 molds are poured at one time, and the...

Embodiment 2

[0075] Put 168kg of 300 mesh coal gangue powder, 22.75kg of 180 mesh pyrophyllite powder and 21kg of 180 mesh kyanite powder into a ball mill for ball milling for 6 hours until the mesh reaches 2000 mesh.

[0076] The slurry that has been ball milled is released and placed in the storage tank to keep stirring for later use.

[0077] Once stirred, 186kg of ball mill slurry, 26.97kg of 300-mesh refractory clay and 27.9kg of 550-mesh calcium carbonate were taken from the storage tank and stirred for 20 minutes at the same time, and the temperature of the slurry was controlled at about 26°C;

[0078] Secondary stirring: add cement 8kg, coagulant 17.8kg, zirconium-containing fiber 1.86kg and other auxiliary materials at the same time and stir for 13 minutes. After the stirring is completed, add foaming agent and stir for 30 seconds, let it fully stir to make the bubbles more uniform.

[0079] Quantitative pouring: 196 molds are poured at one time, and the pouring time is 12 minutes...

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Abstract

The invention provides a preparation method of a difficult-to-crack anorthite lightweight refractory material. According to the preparation method of the invention, a water absorption device is cushioned on an aluminum alloy plate (cushion plate) of the lower mold of a pouring mold, so that moisture in slurry can seep out of a paperboard, the overflowing speed of the moisture at the bottom is reduced, the effect of reducing cracks of a dry blank is achieved; and the cracks are reduced by 80% compared with the cracks of a dried pouring blank obtained at the absence of the water absorption device; an organic-inorganic combined resin water-absorbing coating with the thickness of 1-2 mm can be sprayed on the water absorption device; the coating can be dried in the subsequent drying process after absorbing water, and the coating cannot be adhered to anorthite brick blanks after being dried, so that the coating can be recycled. The invention also provides a difficult-to-crack anorthite lightweight refractory material.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to an anorthite lightweight refractory material which is not prone to cracks and a preparation method thereof. Background technique [0002] Anorthite bricks have high porosity, low bulk density, and good thermal insulation properties, and are widely used as thermal insulation filling materials for the space between refractory bricks and cylinders inside various industrial kilns. It is used to reduce the heat loss of the kiln to obtain high energy utilization efficiency. The melting point of anorthite is 1550°C. It has the characteristics of low density, small thermal expansion coefficient, low thermal conductivity, and stable existence in reducing atmosphere. It can partially replace clay, siliceous and high Aluminum refractory materials, and realize energy saving and emission reduction. [0003] The existing anorthite lightweight refractory bricks not on...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B33/13C04B33/132C04B33/36C04B38/10
CPCC04B35/66C04B33/132C04B33/36C04B33/131C04B38/10C04B2235/3463C04B2235/3208C04B2235/96C04B2235/9607Y02P40/60
Inventor 荆桂花郭金胜张成娟谢宜唐锋张成贺
Owner 山东鲁阳浩特高技术纤维有限公司
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