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Silicon carbide magnesite brick

A technology of silicon carbide magnesium and silicon carbide, which is applied in the field of silicon carbide magnesium bricks, can solve the problems of environmental pollution, high production cost, and high price, and achieve good thermal insulation performance, small thermal conductivity, and save freight.

Inactive Publication Date: 2013-04-10
大石桥市中建镁砖有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there are many methods of producing refractory magnesia bricks at home and abroad, such as: chrome-magnesia bricks produced with chromium-containing raw materials and magnesia as the main raw materials. Zirconium-magnesia bricks produced with magnesia as the main raw material, aluminum-magnesia bricks produced with aluminum-containing raw materials and magnesia as the main raw materials, their main shortcomings are expensive, high production costs, and unbearable for users; iron-containing raw materials and magnesia are the main raw materials The main shortcoming of the produced iron-magnesia bricks is that it cannot be produced in a reducing atmosphere, and it does not meet the needs of users.

Method used

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  • Silicon carbide magnesite brick

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Experimental program
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Effect test

Embodiment 1

[0011] Put: silicon carbide (SiC) raw material: 25 parts, magnesia (MeO) raw material: 75 parts, binder: 3 parts; put it into the batching mixing tank, stir for 20 minutes at normal temperature and normal pressure; after that, send it into The mold of the brick making machine is pressed and formed under a pressure of two tons per square centimeter; then it is sent into a tunnel kiln, and fired for 2.5 hours at a temperature of 1550 degrees Celsius in a reducing atmosphere, and then it is released from the kiln and put into storage.

[0012] The binder in the present invention is the waste liquid produced in the paper mill-sodium lignosulfonate solution. It can also be prepared as a 13% sodium lignosulfonate solution.

Embodiment 2

[0014] Put: silicon carbide (SiC) raw material: 30 parts, magnesia (MeO) raw material: 70 parts, binder: 4 parts; put it into the batching mixing tank, stir at normal temperature and pressure for 25 minutes; after that, send it into The mold of the brick making machine is pressed under the pressure of two tons per square centimeter; then it is sent into the tunnel kiln, and it is fired for 3 hours at a temperature of 1600 degrees Celsius in a reducing atmosphere, and then it is out of the kiln and put into storage.

[0015] The binder in the present invention is the waste liquid produced in the paper mill-sodium lignosulfonate solution. It can also be a 20% sodium lignosulfonate solution mixed with water.

Embodiment 3

[0017] Put: silicon carbide (SiC) raw material: 35 parts, magnesia (MeO) raw material: 65 parts, binder: 5 parts; put them into the batching mixing tank, stir at normal temperature and pressure for 30 minutes; The mold of the brick making machine is pressed and formed under a pressure of two tons per square centimeter; then it is sent into a tunnel kiln, and fired for 3.5 hours at a temperature of 1650 degrees Celsius in a reducing atmosphere, and then it is released from the kiln and put into storage.

[0018] The binder in the present invention is the waste liquid produced in the paper mill-sodium lignosulfonate solution. It can also be made into 25% sodium lignosulfonate solution with water.

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Abstract

The invention relates to a production method of silicon carbide magnesite brick, which takes silicon carbide and magnesite as main raw materials. The method is characterized by comprising the steps of: mixing the silicon carbide, the magnesite and an adhesive, stirring, molding by pressing and carrying out high-temperature calcination to obtain the refractory brick. Compared with the prior art, the preparation method has the advantages that 1, the method is free from pollution, and the refractory material does not contain harmful substances, such as chromium, which cause environmental pollution, so that the production method is in accordance with the requirements of environmental protection; 2, the method is low in preparation cost; the silicon carbide and magnesium oxide are local resources, so that the transportation expenses can be saved; and 3, the silicon carbide magnesite brick is long in service life, and the product is prepared under the reducing atmosphere, so that the service life of the product is much longer than that of an iron magnesium refractory brick in a steel-making or iron-making furnace. Furthermore, the product disclosed by the invention has the advantages of low heat conductivity coefficient, good thermal insulation performance, energy saving, etc.

Description

Technical field: [0001] The invention relates to a production method of a new material refractory brick, specifically a production method of a silicon carbide magnesia brick with silicon carbide and magnesia as main raw materials. Background technique: [0002] At present, there are many ways to produce refractory magnesia bricks at home and abroad, such as: chromium-containing raw materials and magnesia are the main raw materials for the production of chrome-magnesia bricks. Zirconium-magnesia bricks produced with magnesia as the main raw material, aluminum-magnesia bricks produced with aluminum-containing raw materials and magnesia as the main raw materials, their main shortcomings are expensive, high production costs, and unbearable for users; iron-containing raw materials and magnesia are the main raw materials The main shortcoming of the iron-magnesia bricks produced is that they cannot be produced in a reducing atmosphere, and they do not meet the needs of users. Inv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 李洪义唐家彬
Owner 大石桥市中建镁砖有限公司