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Magnesia chrome carbon coating and preparation method thereof

A kind of smear and carbon technology, 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 looseness

Inactive Publication Date: 2011-08-03
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 service life is generally about 16 hours; (2) the traditional waste In the magnesia carbon brick recycling technology, the amount of waste magnesia carbon bricks added is less, generally 10~30%
The disadvantage of the above technology is that the waste magnesia-carbon bricks are decarbonized, which loses the original excellent properties of magnesia-carbon refractory materials such as slag resistance and thermal shock resistance, and increases the processing cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] A magnesia-chromium carbon coating material, which is composed of the following materials according to 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 Micropowder 2.5%, soft clay 2.0%, silicon carbide 2.5% smaller than 0.083mm, SiO 2 Superfine powder 2.0%, 1.35% metallic silicon with a particle size less than 0.083mm, 0.01% metallic aluminum with a particle size less than 0.165mm, 0.09% calcium lignosulfonate, 0.5% sodium tripolyphosphate, 0.05% explosion-proof fiber, all percentages by weight . The dosage of waste magnesia carbon bricks reaches 70%.

[0050] The waste magnesia carbon bricks are the MT-14A waste magnesia carbon bricks used in the slag lining line of the LF refining ladle of the dismantled steelmaking plant. The preparation method and steps are:

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

Embodiment 2

[0061] A magnesia-chromium carbon coating material, which is composed of the following materials according to 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 Micro powder 2.5%, soft clay 1.5%, silicon carbide 2.0% with a particle size less than 0.083mm, SiO 2 1.5% ultrafine powder, 1.35% of metallic silicon with a particle size of less than 0.083mm, 0.02% of metallic 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 weight percentage . The added amount of waste magnesia carbon bricks reaches 72%.

[0063] Others are the same as in Example 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 andscouring 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 carbon coating material and a preparation method thereof, and belongs to the technical field of non-metallic refractory materials. Background technique [0002] Using waste magnesia carbon bricks as raw materials, the developed magnesia-chromium carbon coating material 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 magnesium-carbon coating prepared by the traditional process formula are: (1) The coating has poor corrosion resistance and the service life of the tundish lining is low, such as in small square 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-final shaped billets, the servi...

Claims

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Application Information

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