Magnesia chrome carbon coating and preparation method thereof

A kind of smear and carbon technology, which is applied in the field of magnesia-chromium carbon smear and its preparation, can solve the problem of loss of slag resistance and thermal shock resistance, low service life of tundish lining, poor corrosion resistance of smear, etc. problems, to achieve the effect of increasing the amount of recycling, reducing the excess of tundish injection, and solving the problem of surface porosity

Inactive Publication Date: 2009-10-07
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the magnesia-carbon smear prepared by the traditional process formula has the main defects in production practice: (1) The smear has poor corrosion resistance and the service life of the tundish lining is low, such as in billets and rectangular billets. For small and medium-sized continuous casting tundishes, the maximum service life is generally about 20 hours; while for large continuous casting tundishes such as slabs and near-net shape billets, the s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A kind of magnesia-chromium carbonaceous smear is made up of following material by weight percentage:

[0049] 20% of waste magnesia-carbon bricks with a particle size of 5-3mm, 20% of waste magnesia-carbon bricks with a particle size of 2 o 3 2.5% micropowder, 2.0% soft clay, 2.5% silicon carbide with particle size less than 0.083mm, SiO 2 2.0% of superfine powder, 1.35% of metal silicon with a particle size of less than 0.083mm, 0.01% of metal aluminum with a particle size of less than 0.165mm, 0.09% of calcium lignosulfonate, 0.5% of sodium tripolyphosphate, and 0.05% of explosion-proof fiber, all in percent by weight . The addition amount of waste magnesia carbon bricks reaches 70%.

[0050] The waste magnesia-carbon brick is the MT-14A waste magnesia-carbon brick used for the LF refining ladle line of the demolished steelmaking plant, and its preparation method and steps are:

[0051] 1) Use a special tool with a hammer at one end and an awl at the other end to ...

Embodiment 2

[0061] A kind of magnesia-chromium carbonaceous smear is made up of following material by weight percentage:

[0062] 19% of waste magnesia-carbon bricks with a particle size of 5-3mm, 21% of waste magnesia-carbon bricks with a particle size of 2 o 3 Micropowder 2.5%, soft clay 1.5%, silicon carbide less than 0.083mm particle size 2.0%, SiO 2 1.5% of superfine powder, 1.35% of metal silicon with a particle size of less than 0.083mm, 0.02% of metal aluminum with a particle size of less than 0.165mm, 0.08% of calcium lignosulfonate, 0.5% of sodium tripolyphosphate, and 0.05% of explosion-proof fiber, all in percent by weight . The addition amount of waste magnesia carbon bricks reaches 72%.

[0063] Others are the same as embodiment 1.

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PUM

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Abstract

The invention pertains to the technical field of non-metal refractory materials, which relates to a magnesia chrome carbon coating and a preparation method thereof. The magnesia chrome carbon coating is researched and developed by taking waste magnesia carbon bricks as raw materials. The proportioning ratio of the waste magnesia carbon bricks is more than 65 percent, thereby increasing the recycling quantity of the waste magnesia carbon bricks and lowering the production cost of the magnesia chrome carbon coating. The magnesia chrome carbon coating can be used as the coating of continuous casting tundish working lining and as the patching material of the lower groove working lining of an RH vacuum furnace. The magnesia chrome carbon coating made from the components can bear the erosion and scouring of high-temperature molten steel (1550 DEG C to 1650 DEG C) for more than 24 hours and has good resistance to erosion, scouring and oxidation.

Description

technical field [0001] The invention relates to a magnesium-chromium carbonaceous smear and a preparation method thereof, belonging to the technical field of non-metallic refractory materials. Background technique [0002] Using waste magnesia-carbon bricks as raw materials, the magnesia-chromium-carbon smear material developed is used for the working lining of continuous casting machine tundish, which is one of the important technologies for recycling waste magnesia-carbon bricks. However, the main defects in the production practice of the magnesia-carbon smear prepared by the traditional process formula are: (1) The smear has poor corrosion resistance, and the service life of the tundish lining is low, such as in billets and rectangular billets. For small and medium-sized continuous casting tundishes, the maximum service life is generally about 20 hours; while for large continuous casting tundishes such as slabs and near-net shape billets, the service life is generally abo...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B41/87
Inventor 武光君鹿洪利王学新王金洪
Owner LAIWU IRON & STEEL GRP
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