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Magnesite dolomite dry ramming mix for medium-frequency induction furnace lining and preparation method of magnesite dolomite dry ramming mix

An induction furnace and dolomite technology, applied in the field of refractory materials, can solve the problems of cracking and spalling, low refractoriness, influence of steel quality, etc., and achieve the effects of improving thermal shock stability, high refractoriness and improving service life.

Inactive Publication Date: 2019-08-30
裘伟 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The disadvantages of the above dry hammering are obvious. The acidic dry hammering has low refractoriness, and the main component SiO2 in it has an impact on the quality of steel.
Alkaline dry beater cracks and peels off when used in large-capacity intermediate frequency furnaces; it is only suitable for small and miniature intermediate frequency induction furnaces

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A dry magnesia dolomite material for the lining of an intermediate frequency induction furnace. The raw materials include:

[0033] A: Dolomite sand 6mm≧particle size>3mm, 17 parts;

[0034] B: Dolomite sand 3mm≧particle size>1mm, 25 parts;

[0035] D: Fused magnesia 1mm≧particle size>0mm, 36 parts;

[0036] F: Fused magnesia 0.045mm≧particle size>0.074mm, 19 parts;

[0037] Desiliconized fused zirconia 325 mesh, 3 parts.

[0038] The preparation method of above-mentioned dry beater comprises:

[0039] 1) Screen the dolomite sand particles with a particle size of 0-8mm directly calcined in a high-temperature rotary kiln, and screen out the following particle sizes: 6mm≧particle size>3mm, 3mm≧particle size>1mm; The crushing and crushing systems screen out the following particle sizes: 1mm≧particle size>0mm, 0.045mm≧particle size>0.074mm.

[0040] 2) demagnetization treatment of each raw material;

[0041] 3) Put the raw materials D, F and desiliconized fused zircon...

Embodiment 2

[0047] A dry magnesia dolomite material for the lining of an intermediate frequency induction furnace. The raw materials include:

[0048] A: Dolomite sand 6mm≧particle size>3mm, 10 parts;

[0049] B: Dolomite sand 3mm≧particle size>1mm, 22 parts;

[0050] D: Fused magnesia 1mm≧particle size>0mm, 28 parts;

[0051] F: fused magnesia 0.045mm≧particle size>0.074mm, 16 parts;

[0052] Desiliconized fused zirconia 325 mesh, 3.5 parts.

[0053] The preparation method of above-mentioned dry beater comprises:

[0054] 1) Screen the dolomite sand particles with a particle size of 0-8mm directly calcined in a high-temperature rotary kiln, and screen out the following particle sizes: 6mm≧particle size>3mm, 3mm≧particle size>1mm; The crushing and crushing systems screen out the following particle sizes: 1mm≧particle size>0mm, 0.045mm≧particle size>0.074mm.

[0055] 2) demagnetization treatment of each raw material;

[0056] 3) Put the raw materials D, F and desiliconized fused zirc...

Embodiment 3

[0062] A dry magnesia dolomite material for the lining of an intermediate frequency induction furnace. The raw materials include:

[0063] A: Dolomite sand 6mm≧particle size>3mm, 15 parts;

[0064] B: Dolomite sand 3mm≧particle size>1mm, 28 parts;

[0065] D: Fused magnesia 1mm≧particle size>0mm, 24 parts;

[0066] F: Fused magnesia 0.045mm≧particle size>0.074mm, 18 parts;

[0067] Desiliconized fused zirconia 325 mesh, 4 parts.

[0068] The preparation method of above-mentioned dry beater comprises:

[0069] 1) Screen the dolomite sand particles with a particle size of 0-8mm directly calcined in a high-temperature rotary kiln, and screen out the following particle sizes: 6mm≧particle size>3mm, 3mm≧particle size>1mm; The crushing and crushing systems screen out the following particle sizes: 1mm≧particle size>0mm, 0.045mm≧particle size>0.074mm.

[0070] 2) demagnetization treatment of each raw material;

[0071] 3) Put the raw materials D, F and desiliconized fused zircon...

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Abstract

The invention relates to a magnesite dolomite dry ramming mix for a medium-frequency induction furnace lining. The product is a loose, dry and uniform aggregate, and components comprise calcined dolomite sand particles, fused magnesite and desiliconized fused zirconia. The product comprises the following components in parts by weight: 1-19 parts of dolomite sand having a particle size of more than3mm and less than or equal to 6mm, 20-30 parts of dolomite sand having a particle size of more than 1mm and less than or equal to 3mm, 0-13 parts of dolomite sand having a particle size of more than0.3mm and less than or equal to 1mm, 20-40 parts of fused magnesite having a particle size of more than 0mm and less than or equal to 1mm, 15-23 parts of fused magnesite having a particle size of morethan 0.074mm and less than or equal to 0.045mm, and 2-6.5 parts of 325-mesh desiliconized fused zirconia. The dry ramming mix disclosed by the invention has a desulfurization effect; nonmetallic inclusions in molten steel are removed, and the molten steel is purified; high-temperature performance is excellent; the thermal shock resistance is improved; and the refractoriness is high.

Description

technical field [0001] The invention relates to a refractory material, in particular to a dry magnesia dolomite material for the lining of an intermediate frequency induction furnace and a preparation method thereof. Background technique [0002] The intermediate frequency induction furnace has the advantages of high efficiency, energy saving, easy adjustment of composition, and easy control of atmosphere, so it has been widely used in casting and steelmaking production in my country. In recent years, with the development of high-power thyristor variable frequency power supply and the improvement of reliability, intermediate frequency induction furnaces have gradually developed towards large capacity and high power, and the working conditions have become increasingly harsh, which requires higher requirements for furnace lining refractory materials. [0003] The refractory materials used for the lining of intermediate frequency induction furnace are divided into three types a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043
CPCC04B35/0435C04B2235/321C04B2235/3244C04B2235/5427
Inventor 裘伟裘舒涵常悦琪王相丰
Owner 裘伟
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