CN117986006A - Composite refractory material for vacuum induction furnace lining and preparation method thereof - Google Patents

Composite refractory material for vacuum induction furnace lining and preparation method thereof Download PDF

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Publication number
CN117986006A
CN117986006A CN202311833416.7A CN202311833416A CN117986006A CN 117986006 A CN117986006 A CN 117986006A CN 202311833416 A CN202311833416 A CN 202311833416A CN 117986006 A CN117986006 A CN 117986006A
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parts
composite refractory
corundum
induction furnace
furnace lining
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CN202311833416.7A
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王相丰
裘伟
常蕊
姜茂龙
王维
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Haicheng Jinfufeng Refractory Material Co ltd
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Haicheng Jinfufeng Refractory Material Co ltd
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Priority to CN202311833416.7A priority Critical patent/CN117986006A/en
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  • Compositions Of Oxide Ceramics (AREA)

Abstract

The invention relates to a composite refractory material for a vacuum induction furnace lining and a preparation method thereof, wherein the composite refractory material comprises the following raw materials in parts by weight: 50-80 parts of fused white corundum, 20-45 parts of fused magnesia, 20-25 parts of synthetic magnesia-calcium sand, 15-25 parts of alumina micropowder, 10-15 parts of quartz sand, 5-10 parts of bauxite, 4-8 parts of silicon carbide, 3-7 parts of binding agent and 0.5-2 parts of additive; the electro-fused white corundum comprises spherical corundum and plate-shaped corundum, wherein the mass ratio of the spherical corundum to the plate-shaped corundum is 1: (1-3). The composite refractory material can improve the earthquake resistance and corrosion resistance of the lining, thereby prolonging the service life of the lining.

Description

Composite refractory material for vacuum induction furnace lining and preparation method thereof
Technical Field
The invention relates to the technical field of refractory materials, in particular to a composite refractory material for a vacuum induction furnace lining and a preparation method thereof.
Background
With the continuous development of modern industry, the blast furnace technology is also advancing, and one of the most important parameters is the service life of the blast furnace. In addition to this, the trend towards rationalization and further optimization of the operating parameters due to the progressive trend of the structural parameters of the blast furnace body, advances in the materials and construction techniques of the blast furnace lining are also important components that cannot be neglected.
At present, the vacuum induction furnace lining materials used at home and abroad mainly comprise corundum furnace lining materials, magnesia furnace lining, quartz sand furnace lining, bauxite furnace lining and the like. The use effect is not ideal all the time, the service life is short, and the crucible is eroded.
Therefore, there is a need for a composite refractory material for vacuum induction furnace liners that improves the corrosion resistance, shock resistance, and service life of the liner.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention solves the technical problem of providing the composite refractory material for the vacuum induction furnace lining and the preparation method thereof, and the composite refractory material can improve the anti-seismic performance and the corrosion resistance of the lining, thereby prolonging the service life of the lining.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the composite refractory material for the vacuum induction furnace lining comprises the following raw materials in parts by weight:
50-80 parts of fused white corundum, 20-45 parts of fused magnesia, 20-25 parts of synthetic magnesia-calcium sand, 15-25 parts of alumina micropowder, 10-15 parts of quartz sand, 5-10 parts of bauxite, 4-8 parts of silicon carbide, 3-7 parts of binding agent and 0.5-2 parts of additive; the electro-fused white corundum comprises spherical corundum and plate-shaped corundum, wherein the mass ratio of the spherical corundum to the plate-shaped corundum is 1: (1-3).
The content of magnesium oxide in the fused magnesia is more than 98 percent.
The granularity of the alumina micropowder is 325 meshes.
The granularity of the silicon carbide powder is 200 meshes.
The bonding agent is one or two of boric acid and dye-grade chromium oxide green.
The additive is clay.
A preparation method of a composite refractory material for a vacuum induction furnace lining comprises the following steps:
1) The used raw materials are detected according to the required standard, and the qualified raw materials can be used after being qualified;
2) Weighing various materials according to the proportion in the formula, and putting the materials into a forced stirrer for mixing for 20-40 min;
3) Drying the obtained mixture fully, and performing dry pressing on the dried mixture on a press under the pressure of 98-120MPa to obtain a block;
4) And sintering the green sheet at high temperature to obtain the composite refractory material.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention adopts two fused white corundum with different shapes, namely spherical corundum and plate-shaped corundum, wherein the spherical corundum has low sintering activity and slowly reacts with quartz sand to generate a very small amount of mullite phase with large size, thereby endowing a product with good fracture resistance and excellent high-temperature service performance, and the plate-shaped corundum has relatively high reactivity and can generate more small-size grains with uniform distribution, thereby providing the product with higher porosity, low thermal expansion coefficient and excellent thermal shock resistance.
(2) The invention can improve the oxidation resistance of the refractory material by adding the silicon carbide powder and the alumina micropowder, prevent the refractory material from cracking or expanding, and enhance the normal pressure compressive strength, the high temperature flexural strength and the corrosion resistance of the refractory material.
(3) The invention has the advantages that the addition of the alumina and the silicon carbide material can enhance the wear resistance, the high load softening temperature and strength, the thermal shock resistance, the alkali gas corrosion resistance and the like of the refractory material, and is beneficial to prolonging the service life of the refractory material.
Detailed Description
Example 1
The composite refractory material for the vacuum induction furnace lining comprises the following raw materials in parts by weight:
50 parts of fused white corundum, 25 parts of fused magnesia, 20 parts of synthetic magnesia-calcium sand, 15 parts of alumina micropowder, 10 parts of quartz sand, 5 parts of bauxite, 4 parts of silicon carbide, 3 parts of a bonding agent and 1 part of an additive; the electro-fused white corundum comprises spherical corundum and plate-shaped corundum, wherein the mass ratio of the spherical corundum to the plate-shaped corundum is 1:2.
The content of magnesium oxide in the fused magnesia is more than 98 percent.
The granularity of the alumina micropowder is 325 meshes.
The granularity of the silicon carbide powder is 200 meshes.
The bonding agent is one or two of boric acid and dye-grade chromium oxide green.
The additive is clay.
The preparation method of the composite refractory material for the vacuum induction furnace lining comprises the following steps:
1) The used raw materials are detected according to the required standard, and the qualified raw materials can be used after being qualified;
2) Weighing various materials according to the proportion in the formula, and putting the materials into a forced stirrer for mixing for 20-40 min;
3) Drying the obtained mixture fully, and performing dry pressing on the dried mixture on a press under the pressure of 98-120MPa to obtain a block;
4) And sintering the green sheet at high temperature to obtain the composite refractory material.
Example 2
The composite refractory material for the vacuum induction furnace lining comprises the following raw materials in parts by weight:
55 parts of fused white corundum, 30 parts of fused magnesia, 25 parts of synthetic magnesia-calcium sand, 20 parts of alumina micropowder, 15 parts of quartz sand, 8 parts of bauxite, 5 parts of silicon carbide, 3 parts of a bonding agent and 1 part of an additive; the electro-fused white corundum comprises spherical corundum and plate-shaped corundum, wherein the mass ratio of the spherical corundum to the plate-shaped corundum is 1:2.
The content of magnesium oxide in the fused magnesia is more than 98 percent.
The granularity of the alumina micropowder is 325 meshes.
The granularity of the silicon carbide powder is 200 meshes.
The bonding agent is one or two of boric acid and dye-grade chromium oxide green.
The additive is clay.
The preparation method of the composite refractory material for the vacuum induction furnace lining comprises the following steps:
1) The used raw materials are detected according to the required standard, and the qualified raw materials can be used after being qualified;
2) Weighing various materials according to the proportion in the formula, and putting the materials into a forced stirrer for mixing for 20-40 min;
3) Drying the obtained mixture fully, and performing dry pressing on the dried mixture on a press under the pressure of 98-120MPa to obtain a block;
4) And sintering the green sheet at high temperature to obtain the composite refractory material.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention. In addition, the specific features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations are not described further. Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.

Claims (7)

1. The composite refractory material for the vacuum induction furnace lining is characterized by comprising the following raw materials in parts by weight: 50-80 parts of fused white corundum, 20-45 parts of fused magnesia, 20-25 parts of synthetic magnesia-calcium sand, 15-25 parts of alumina micropowder, 10-15 parts of quartz sand, 5-10 parts of bauxite, 4-8 parts of silicon carbide, 3-7 parts of binding agent and 0.5-2 parts of additive; the electro-fused white corundum comprises spherical corundum and plate-shaped corundum, wherein the mass ratio of the spherical corundum to the plate-shaped corundum is 1: (1-3).
2. The composite refractory for a vacuum induction furnace lining according to claim 1, wherein the magnesia content in the fused magnesia is > 98%.
3. The composite refractory for a vacuum induction furnace lining according to claim 1, wherein the alumina fine powder has a particle size of 325 mesh.
4. The composite refractory for a vacuum induction furnace lining according to claim 1, wherein the silicon carbide powder has a grain size of 200 mesh.
5. The composite refractory material for vacuum induction furnace lining according to claim 1, wherein the binder is one or a combination of boric acid and dye-grade chromium oxide green.
6. A composite refractory for a vacuum induction furnace lining according to claim 1, wherein the additive is clay.
7. A method for preparing a composite refractory material for a vacuum induction furnace lining according to any one of claims 1 to 6, comprising the steps of:
1) The used raw materials are detected according to the required standard, and the qualified raw materials can be used after being qualified;
2) Weighing various materials according to the proportion in the formula, and putting the materials into a forced stirrer for mixing for 20-40 min;
3) Drying the obtained mixture fully, and performing dry pressing on the dried mixture on a press under the pressure of 98-120MPa to obtain a block;
4) And sintering the green sheet at high temperature to obtain the composite refractory material.
CN202311833416.7A 2023-12-28 2023-12-28 Composite refractory material for vacuum induction furnace lining and preparation method thereof Pending CN117986006A (en)

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Application Number Priority Date Filing Date Title
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CN117986006A true CN117986006A (en) 2024-05-07

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