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Tundish ultralow-silicon magnesium coating and preparation method thereof

A tundish and coating technology, which is applied in the field of tundish ultra-low silicon magnesia coating and its preparation, can solve problems such as inability to achieve construction performance, and achieve improved physical indexes and mechanical properties, good construction performance, and improved sag performance. Effect

Active Publication Date: 2014-09-03
HUZHOU MINGDE REFRACTORY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the SiO2 content in magnesium coatings is reduced simply by reducing silicon micropowder, the coating will not be able to achieve the construction performance of smearing.

Method used

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  • Tundish ultralow-silicon magnesium coating and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1.1 The tundish ultra-low silicon magnesium coating of the present invention is composed of the following raw materials in parts by weight (Kg):

[0031] 95 magnesia 250, 97 magnesia 700, clay 20, bentonite 30, α-Al 2 o 3 20. Paper fiber 20, lignin 1, sodium tripolyphosphate 3, metal aluminum 0.1, sodium dodecylsulfonate 0.15, polyvinyl alcohol 0.5.

[0032] The particle size of 97 magnesia is 3-1mm; the weight ratio of 1-0mm and 180 mesh is 280:350:275.

[0033] 1.2 The preparation method of the tundish ultra-low silicon magnesium coating of the present invention:

[0034] (1) Firstly crush 95 magnesia and 97 magnesia respectively, then weigh 95 magnesia, 97 magnesia, clay, bentonite α-Al 2 o 3 washi fibers, and blended;

[0035] (2) Take lignin, sodium tripolyphosphate, metal aluminum, sodium laurylsulfonate and polyvinyl alcohol by proportioning, and mix;

[0036] (3) Add the mixture obtained in step (2) to the mixture in step (1), mix evenly, and then pack to ob...

Embodiment 2

[0038] 2.1 The tundish ultra-low silicon magnesium coating of the present invention is composed of the following raw materials in parts by weight (Kg):

[0039] 95 magnesia 300, 97 magnesia 500, clay 0, bentonite 10, α-Al 2 o 3 40. Paper fiber 10, lignin 2, metal aluminum 0.5, sodium dodecyl sulfonate 0.01, polyvinyl alcohol 2.

[0040] The particle size of 97 magnesia is 3-1mm; the weight ratio of 1-0mm and 180 mesh is 280:350:275.

[0041] 2.2 The preparation method of the tundish ultra-low silicon magnesium coating of the present invention

[0042] The preparation method is the same as 1.2 of Example 1.

Embodiment 3

[0044] 1.1 The tundish ultra-low silicon magnesium coating of the present invention is composed of the following raw materials in parts by weight (Kg):

[0045] 995 magnesia 280, 97 magnesia 625, clay 30, bentonite 20, α-Al 2 o 3 30. Paper fiber 15, lignin 1.5, sodium tripolyphosphate 2, metal aluminum 0.25, sodium dodecylsulfonate 0.1, polyvinyl alcohol 1.

[0046] The particle size of 97 magnesia is 3-1mm; the weight ratio of 1-0mm and 180 mesh is 280:350:275.

[0047] 1.2 The preparation method of the tundish ultra-low silicon magnesium coating of the present invention

[0048] The preparation method is the same as 1.2 of Example 1.

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Abstract

The invention discloses a tundish ultralow-silicon magnesium coating which comprises the following raw materials in parts by weight: 250-300 parts of 95 magnesite, 500-700 parts of 97 magnesite, 20-40 parts of clay, 10-30 parts of bentonite, 20-40 parts of alpha-Al2O3, 10-20 parts of paper fiber, 1-2 parts of lignin, 0-3 parts of sodium tripolyphosphate, 0.1-0.5 part of metallic aluminum, 0.01-0.15 part of sodium dodecyl sulfate and 0.5-2 parts of polyvinyl alcohol. The tundish ultralow-silicon magnesium coating disclosed by the invention can achieve good plasticity (spreading property) when a small quantity of gel materials are added by using the polyvinyl alcohol as a film-forming agent and can achieve good construction property by substituting superfine nanoscale high-viscosity ball clays for silicon micropowder, Guangxi mud and kaolin which are contained in the traditional coating and being matched with the film-forming agent PVA (Polyvinyl Alcohol). As for the same coating spreading property, the tundish ultralow-silicon magnesium coating disclosed by the invention only needs to add the superfine nanoscale high-viscosity ball clay (2%), and the traditional magnesium coating needs to add the silicon micropowder (4%-6%) and ordinary clay (1%-2%), so that the problem of carrying of free SiO2 contained in the silicon micropowder is solved.

Description

technical field [0001] The invention relates to the technical field of chemistry and chemical engineering, in particular to an ultra-low silicon magnesium coating for a tundish and a preparation method thereof. Background technique [0002] In the steelmaking and continuous casting process system, initially the tundish only acts as a buffer between the ladle and the crystallizer. With the optimization of the continuous casting process and the improvement of the quality requirements for the continuous casting slab, the tundish has evolved into the terminal equipment for molten steel refining, and its main functions are two: one is the refining of molten steel; the other is the elimination of non-metallic inclusions. In order to achieve new functions, the refractory working lining used in the tundish is required (one of the inner linings, usually including permanent lining and working lining), one is "longevity", and the other is "clean". Different steel grades have different...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 严培忠
Owner HUZHOU MINGDE REFRACTORY MATERIAL
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