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Tundish magnesia coating and preparation method thereof

A smear and tundish technology, applied in the field of refractory materials, can solve the problems of product strength reduction, quality stability cannot be guaranteed, no finishing processing, etc., and achieve the effect of low manufacturing cost, low cost and long shelf life

Inactive Publication Date: 2019-09-24
瑞泰马钢新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, since the used magnesia-carbon bricks are simply sorted, sorted, impurity-removed, and crushed without finishing, generally the crushed regenerated magnesia-carbon materials are used directly to replace magnesia particles. The strength of the product will be significantly reduced, and at the same time, direct substitution will not guarantee the quality stability of the product made of recycled raw materials

Method used

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  • Tundish magnesia coating and preparation method thereof
  • Tundish magnesia coating and preparation method thereof
  • Tundish magnesia coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A kind of preparation method of tundish magnesium smear, its steps are as follows:

[0033] (1) All the raw materials are weighed according to the proportion: 54wt% of regenerated magnesia-carbon particles with a particle size of 3-0mm, 4wt% of fused magnesia particles with a particle size of 3-1mm; Particles 12wt%; fused magnesia fine powder with a particle size ≤0.075mm 25wt%; silicon micropowder with a particle size ≤0.088mm 2.3wt%; Guangxi white mud with a particle size ≤0.075mm 5wt%; sodium tripolyphosphate 0.3wt% ; sodium hexametaphosphate 0.3wt%; explosion-proof fiber 0.1wt%.

[0034] (2) Pour the regenerated magnesia-carbon material particles with a particle size of 3-0mm, magnesia particles with a particle size of 3-1mm and 1-0mm into the mixer and mix them for 5 minutes, stir evenly, and then add silicon micropowder and three Sodium polyphosphate and sodium hexametaphosphate were stirred and mixed for 1 minute to prepare a mixture.

[0035] (3) Add fused mag...

Embodiment 2

[0039] A kind of preparation method of tundish magnesium smear, its steps are as follows:

[0040] (1) All raw materials are weighed according to the proportion: 47wt% of sintered magnesia particles with a particle size of 3-0mm, 7wt% of sintered magnesia particles with a particle size of 3-0mm; 13wt% of sintered magnesia particles with a particle size of 1-0mm %; fused magnesia fine powder with a particle size of ≤0.075mm 27wt%; silicon micropowder with a particle size of ≤0.088mm 2.4wt%; bentonite fine powder with a particle size of ≤0.075mm 1.5wt%, Guangxi white mud fine powder 1.5wt% ; Polycarboxylate superplasticizer 0.4wt%; Explosion-proof fiber 0.2wt%.

[0041] (2) Pour the sintered magnesia particles with a particle size of 3-0mm after burning and sintered magnesia particles with a particle size of 3-1mm and 1-0mm into the mixer for 5 minutes, stir evenly, and then add silicon micropowder and The polycarboxylate superplasticizer was stirred and mixed for 1 minute to m...

Embodiment 3

[0046] A kind of preparation method of tundish magnesium smear, its steps are as follows:

[0047] (1) All raw materials are weighed according to the proportion: 30wt% of regenerated magnesia-carbon particles with a particle size of 3-0mm, 12wt% of fused magnesia particles with a particle size of 3-1mm; fused magnesia particles with a particle size of 1-0mm Granules 18wt%; fused magnesia fine powder with a particle size ≤0.075mm 34wt%; silicon micropowder with a particle size ≤0.088mm 3wt%; modified clay fine powder with a particle size ≤0.075mm 2.4wt%; sodium hexametaphosphate 0.3 wt%; explosion-proof fiber 0.3wt%.

[0048] (2) Pour the regenerated magnesia carbon material particles with a particle size of 3-0mm, fused magnesia particles with a particle size of 3-1mm and 1-0mm into the mixer and mix for 5 minutes, stir evenly, and then add silicon micropowder Stir and mix with sodium hexametaphosphate for 1 minute to make a mixture.

[0049] (3) Add fused magnesia fine powd...

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Abstract

The invention belongs to the technical field of refractory materials, and particularly relates to a tundish magnesia coating taking a post-burn regenerated magnesia carbon material as a main raw material and a preparation method thereof. The coating is characterized in that a waste magnesium carbon brick is dried, iron-removed and broken, sufficient burning is conducted at a high temperature, and after drawing, molten tumors and residues remaining on the surface of a reclaimed material are manually cleaned up; after breaking, the insufficiently burnt parts in the middle are manually picked out, the burning rate being 90% is achieved, re-breaking is conducted, and the post-burn regenerated magnesia carbon material with different particle sizes and the MgO content larger than 85 wt% is obtained, so that the tundish magnesia coating taking the post-burn regenerated magnesia carbon material as the main raw material is stable in performance, high in strength, good in demolding, excellent in construction performance and low in cost, and circulating utilization of waste refractory materials is achieved.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and relates to a magnesium smear for a tundish. In particular, it relates to a tundish magnesium smear material whose main raw material is regenerated magnesium carbon material after burning and a preparation method thereof. Background technique [0002] The life of the working layer of the tundish is one of the main factors that determine the number of continuous casting furnaces in continuous casting production. The use of tundish coating materials with good performance is very important for the safety of continuous casting production and the stability of steel quality. Magnesium smear for tundish has excellent properties such as long service life, clean molten steel, and slag resistance. Its main raw materials are sintered magnesia, fused magnesia, etc. In recent years, with the strengthening of national environmental protection supervision, the integration of high energy-consumi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/043C04B35/76
CPCC04B35/043C04B35/76C04B2235/3418C04B2235/447C04B2235/5208C04B2235/349C04B2235/96
Inventor 卢咏明陈海山张小红张兰郁书中彭学峰骆文凯赵杰夫
Owner 瑞泰马钢新材料科技有限公司
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