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MgO-Cr2O3 paint

A coating and raw material technology, applied in the direction of coating, casting molding equipment, casting mold, etc., can solve the problem of low density, linear shrinkage, strength, slag corrosion resistance, low penetration resistance, difficult to meet the requirements of long-term continuous casting, increase Problems such as the difficulty of coating renewal operation, to achieve the effect of excellent corrosion resistance, natural mineral resources saving, and good plasticity

Inactive Publication Date: 2009-01-14
YIXING XINDA REFRACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its shortcomings: one is to use natural magnesia as the main raw material, and the other is to add chromite or directly add Cr to the coating. 2 o 3 , during the steelmaking process, the temperature of molten steel in the tundish reaches above 1550°C, Cr 2 o 3 At high temperature, harmful components will be decomposed, which will seriously affect the health of workers on site and have a greater impact on the environment; moreover, the natural raw materials used are fired only once, and their density, linear shrinkage, strength , slag erosion resistance, impermeability, etc. are relatively low, not only the service life is not high enough, it is difficult to meet the long-term continuous casting requirements, but also in the actual use process, it is easy to cause permanent interlayer sintering and disintegration of the coating and the tundish lining The performance is not good enough, which increases the difficulty of coating renewal operation

Method used

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  • MgO-Cr2O3 paint
  • MgO-Cr2O3 paint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Embodiment 1: the magnesia-chrome brick (bulk density >= 3.0g / cm2) that reclaims with steelworks 3 , MgO≥80%, CaO≤1.4%, SiO 2 ≤1.5%, Cr 2 o 3 ≥8%), after removing the surface slag, they are processed into two kinds of particles of 3-1mm and 1-0mm respectively, as the aggregate of the coating composition, and the fine powder part adopts natural MgO fine powder (index: MgO≥95, CaO≤1.5 , 280 mesh).

[0016] Coating composition (wt%): 3-1mm particles 40%, 1-0mm particles 26%, magnesia fine powder 22.5%, bonded clay 3%, polyphosphate 3%, borate 1.5%, polychloride 2% , 2% paper fiber, plus 0.5% explosion-proof agent. The coating performance index is shown in Table 2.

Embodiment 2

[0017] Embodiment 2: the magnesia-chrome brick (bulk density ≥ 2.9g / cm2) that cement factory reclaims 3 , MgO≥80%, CaO≤1.5%, SiO 2 ≤1.5%, Cr 2 o 3 ≥6%), after removing the surface slag, they are processed into two kinds of particles of 3-1mm and 1-0mm respectively, as the aggregate of the coating composition, and the fine powder part adopts natural MgO fine powder (index: MgO≥95, CaO≤ 1.5, 280 mesh).

[0018] Coating composition (wt%): same as embodiment 1, coating performance index is shown in Table 2.

Embodiment 3

[0019]Embodiment 3: the magnesia-chrome brick (bulk density >= 2.9g / cm3, MgO >= 80%, CaO >= 1.5%, SiO ≤ 1.5%) that cement plant or steelworks reclaim 2 ≤1.5%, Cr 2 o 3 ≥6%), which are processed into two kinds of particles of 3-1mm and 1-0mm, respectively, as the aggregate of the coating composition, and the fine powder part is also fine powder processed from recycled magnesia-chrome bricks (MgO≥80%, Cr 2 o 3 ≥6%, CaO≤1.5, 280 mesh)

[0020] Coating composition (wt%): same as embodiment 1, coating performance index is shown in Table 2.

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Abstract

The present invention relates to the improvement of magnesite-chrome coating that is used for wrapping a working layer, which is characterized in that the coating at least comprises MgO particle and Cr2O3, wherein, the content of the used MgO is more than or equal to 80 percent, the content of Cr2O3 is more than or equal to 8 percent, and the MgO-Cr2O3 brick waste material with the volume concentration being more than or equal to 3 g / cm<3>. Compared with the prior art adopting the natural raw materials, not only a great amount of natural mineral resource is saved, but also different performances of the coating are better than the coating that is made of the natural raw materials; moreover, the price is cheap, the quality is stable, and the coating of the present invention has good plasticity, and is easy to be coated, and is free of fracture, dropping off and explosion, and has favorable corrosion-resistance and long service life; the remained coating is separated from the permanent layer, so that the coating is easy to be sprayed again, thereby having better disassembling property.

Description

technical field [0001] The invention relates to a magnesia-chrome coating for the working layer of the tundish, especially the used MgO-Cr 2 o 3 Magnesia-chrome paint with brick waste as the main raw material. Background technique [0002] The popularization and application of continuous casting tundish rapid nozzle replacement technology in steelmaking plants has continuously increased the number of furnaces for continuous casting of molten steel, and the working layer of the tundish has gradually been replaced by magnesium coatings and magnesium chrome coatings from traditional heat insulation panels, achieving efficient and rapid Continuous casting. Magnesium coating is an alkaline refractory material, which can effectively absorb harmful non-metallic impurities such as S and P in molten steel, and due to SiO 2 It has low content, can purify molten steel components, has good corrosion resistance, scouring and slag resistance, long service life, good disintegration, and...

Claims

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Application Information

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IPC IPC(8): B22C3/00C04B35/66
Inventor 吴锐强许俊元
Owner YIXING XINDA REFRACTORY
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