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Dry material for continuous casting tundish working lining and preparation method of dry material

A continuous casting tundish and working lining technology, applied in casting equipment, metal processing equipment, manufacturing tools, etc., can solve unfavorable clean steelmaking and environmental protection requirements, can not meet the use requirements for a long time, compact structure and poor thermal insulation performance, etc. problems, to achieve excellent corrosion resistance to molten steel and slag, good environmental compatibility, and good performance in slag corrosion resistance

Inactive Publication Date: 2019-01-18
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tundish produced by this patented technology has the characteristics of good corrosion resistance, easy disassembly, long service life, no toxic and harmful gas generation, and no pollution to the environment, but it is easy to crack and collapse during the baking process
CN105418082A discloses a long-life environmental protection tundish dry material. The invention uses fused magnesia as the main raw material, and chooses rosin and hydrous silicate as the composite binder. Although it solves the harmful irritation caused by the baking of the resin binder Gas and unfavorable to clean steelmaking and environmental protection requirements, but the dry material has a dense structure and poor thermal insulation performance during use
[0004] In summary, the currently known dry materials mainly have the following technical problems: first, the binder is not environmentally friendly, and it is easy to pollute the environment during the baking process; The dry release strength is low and cracks are prone to occur; third, the dry material working lining has poor thermal insulation performance during use and cannot meet the use requirements for a long time. These shortcomings restrict the large-scale use of dry material tundishes

Method used

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  • Dry material for continuous casting tundish working lining and preparation method of dry material
  • Dry material for continuous casting tundish working lining and preparation method of dry material
  • Dry material for continuous casting tundish working lining and preparation method of dry material

Examples

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Effect test

Embodiment 1

[0029] A dry material for continuous casting tundish working lining, the preparation method of which comprises the following steps:

[0030] 1) select raw materials by the following mass percentages:

[0031] (1) Main raw materials: magnesia 55%, calcined dolomite 20%, magnesia dolomite sand 10% (of which MgO content is 65%), magnesia carbon brick recycled material 5%;

[0032] The particle size ratio of magnesia used is: 8-5mm accounts for 10%, 5-3mm accounts for 10%, 3-1mm accounts for 25%, 1-0.5mm accounts for 10%, 0.5-0.088mm accounts for 20%, and less than 0.088mm accounts for 20%. 25%; the particle size ratio of calcined dolomite used is: 3-1mm accounts for 20%, 1-0.5mm accounts for 30%, 0.5-0.088mm accounts for 25%, and less than 0.088mm accounts for 25%; the particle size of magnesium dolomite sand used The proportion is: 3-1mm accounts for 20%, 1-0.5mm accounts for 25%, 0.5-0.088mm accounts for 25%, less than 0.088mm accounts for 30%; 35%, 1-0.5mm accounted for 35%,...

Embodiment 2

[0044] A dry material for continuous casting tundish working lining, the preparation method of which comprises the following steps:

[0045] 1) select raw materials by the following mass percentages:

[0046] (1) Main raw materials: magnesia 70%, calcined dolomite 10%, magnesia dolomite sand 10% (of which MgO content is 50%), magnesia carbon brick recycled material 5%;

[0047] The particle size ratio of magnesia used is: 8-5mm accounts for 5%, 5-3mm accounts for 10%, 3-1mm accounts for 20%, 1-0.5mm accounts for 10%, 0.5-0.088mm accounts for 25%, and less than 0.088mm accounts for 25%. 30%; the particle size ratio of calcined dolomite used is: 3-1mm accounts for 35%, 1-0.5mm accounts for 20%, 0.5-0.088mm accounts for 15%, less than 0.088mm accounts for 30%; the particle size of magnesium dolomite sand used The proportion is: 3-1mm accounts for 25%, 1-0.5mm accounts for 35%, 0.5-0.088mm accounts for 25%, less than 0.088mm accounts for 15%; 40%, 1-0.5mm accounted for 40%, less...

Embodiment 3

[0060] A dry material for continuous casting tundish working lining, the preparation method of which comprises the following steps:

[0061] 1) select raw materials by the following mass percentages:

[0062] (1) Main raw materials: magnesia 40%, calcined dolomite 25%, magnesia dolomite sand 10% (including MgO content of 70%), magnesia carbon brick recycled material 15%;

[0063] The particle size ratio of magnesia used is: 8-5mm accounts for 10%, 5-3mm accounts for 15%, 3-1mm accounts for 20%, 1-0.5mm accounts for 12%, 0.5-0.088mm accounts for 20%, and less than 0.088mm accounts for 20%. 23%; the particle size ratio of calcined dolomite used is: 3-1mm accounts for 30%, 1-0.5mm accounts for 25%, 0.5-0.088mm accounts for 20%, less than 0.088mm accounts for 25%; the particle size of magnesium dolomite sand used The proportion is: 3-1mm accounts for 20%, 1-0.5mm accounts for 30%, 0.5-0.088mm accounts for 20%, less than 0.088mm accounts for 30%; 40%, 1-0.5mm accounted for 45%, l...

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Abstract

The invention relates to a dry material for a continuous casting tundish working lining and a preparation method of the dry material. The dry material contains the following raw material components inpercentage by weight: 40%-70% of magnesia, 10%-25% of burnt dolomite, 10%-30% of konite sand, 5%-15% of recycled magnesia carbon bricks, 1.0%-5.0% of a low-temperature binder, 0-5% of clay, 0.5%-8% of a medium-temperature binder, 0.5%-5% of an antioxidant, 0.5%-5% of a sintering aid and 0.1%-5% of a dust inhibitor. The volume density of the prepared tundish working lining is 1.8g / cm<3>-2.5g / cm<3>, the 110DEG C*20h compression strength is 2.5MPa-4MPa, the 1550DEG C*3h compression strength is 6MPa-12MPa, the refractoriness is more than 1750 DEG C, the linear change rate is (-4%)-(4%), the dry material does not crack after being cooled with water at 1100 DEG C for 50 times, the service life is more than 30h, and the dry material has the characteristics of high strength, good thermal shock resistance and scouring resistance, strong molten steel purifying capability, long life and environmental friendliness.

Description

technical field [0001] The invention belongs to the technical field of refractory materials for steelmaking and continuous casting, and relates to a dry material for continuous casting tundish lining and a preparation method thereof. Background technique [0002] The tundish is a transition vessel between the ladle and the crystallizer in the continuous casting process. With the advancement of technology, the molten steel reheating technology, tundish heat preservation technology, argon gas sealing and argon gas stirring technology have been applied to the molten steel in the tundish. The common goal of these technical applications is to remove non-metallic inclusions in molten steel, prevent secondary oxidation, reduce the erosion of refractory materials on molten steel and the involvement of slag in tundishes. Tundish dry material is a new generation of working lining refractory material developed in recent years. It has the advantages of convenient construction, fast hea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043C04B35/80C04B35/82C04B35/622B22D41/02
CPCC04B35/803C04B35/043C04B35/62204C04B35/82C04B2235/3201C04B2235/321C04B2235/3409C04B2235/3427C04B2235/349C04B2235/401C04B2235/402C04B2235/405C04B2235/428C04B2235/447C04B2235/5224C04B2235/77C04B2235/96C04B2235/9607C04B2235/9676
Inventor 刘孟陈光友
Owner 武汉钢铁有限公司
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