Low cost dolomite continuous casting tundish coating

A continuous casting tundish and dolomite technology, applied in the field of continuous casting in steelmaking production, can solve the problems of poor bonding ability, high price, high production cost, etc., and achieve good performance, good economic and social benefits, and low production cost Reduced effect

Inactive Publication Date: 2014-01-15
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Most of the existing coatings for the working layer of the tundish use metallurgical magnesia as the aggregate, such as Chinese patents CN1320577A, CN101342587A and CN101386543A. Although this coating has strong corrosion resistance and long service life, due to metallurgical magnesium The price of sand raw materials is relatively high, and the transportation cost is also high, so the cost is high
There are also tundish coatings with dolomite as the main material and metallurgical magnesia, chromite, etc., such as Chinese patent CN1074635A, but also due to the high price of metallurgical magnesia raw materials, its production cost is also high, and it does not contain Paper fiber and other components, its bonding ability is poor

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] In terms of weight percentage, 55% of dolomite particles, 38% of magnesia-chrome waste brick particles, 35% of particles with a particle size of 3-2 mm, 45% of particles with a particle size of 2-1 mm, and the rest with a particle size of less than 1 mm Fine powder particles, 2% bauxite, 2% soft clay, 1.5% high alumina cement, 0.5% sodium tripolyphosphate, 1% paper fiber, add 20% water to the mixture according to the above ratio, and stir evenly Then apply to the tundish lining.

[0019] Example 1 After the tundish coating was calcined at 1550°C for 3 hours, the measured chemical composition was: CaO 52.3%, MgO 32.6%, SiO 2 5.3%, Fe 2 o 3 0.90%, Al 2 o 3 0.8%, volume density 1.34 g / cm3, compressive strength: 110℃×24h, 11.3 MPa; 1550℃×3h, 12.2 MPa, linear change rate: 1550℃×3h, -2.4%, refractoriness ≥ 1790℃ .

Embodiment 2

[0021] In terms of weight percentage, 60% of dolomite particles, 31% of magnesia-chrome waste brick particles, 38% of particle size 3-2 mm, 48% of particle size 2-1 mm, and the rest are fine particles with a particle size of less than 1 mm. Powder particles, 2.5% bauxite, 2.5% soft clay, 1.8% high alumina cement, 0.8% sodium tripolyphosphate, 1.4% paper fiber, the mixture according to the above ratio plus 20% water of the total amount of raw materials, after stirring Apply to tundish lining.

[0022] Example 2 After the tundish coating was calcined at 1550°C for 3 hours, the measured chemical composition was: CaO 54.2%, MgO 30.5%, SiO 2 5.6%, Fe 2 o 3 1.03%, Al 2 o 3 0.7%, bulk density 1.33 g / cm3, compressive strength: 110℃×24h, 11.5 MPa; 1550℃×3h, 12.4 MPa, linear change rate: 1550℃×3h, -2.5%, refractoriness ≥ 1790℃ .

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Abstract

The invention relates to a low cost dolomite continuous casting tundish coating, which is prepared from the following raw materials by weight: 50%-65% of dolomite particles, 30%-45% of magnesium chromium waste brick particles, 1%-3.5% of bauxite, 1%-3.5% of soft clay, 1%-2% of high alumina cement, 0.2%-1.5% of sodium tripolyphosphate, and 0.5%-1.5% of paper fibers. The dolomite particles and the magnesium chromium waste brick particles have a particle size ratio, by weight, as the following: the particles with a particle size of 3-2mm account for 35%-45%, the particles with a particle size of 2-1mm account for 45%-55%; and the balance is fine powder particles with a particle size of less than 1mm. Compared with the prior coatings, the dolomite continuous casting tundish coating provided by the invention has the advantages of low production cost and good use performance, and realizes recycling of magnesium chromium waste bricks, thus having good economic and social benefits.

Description

technical field [0001] The invention belongs to the technical field of continuous casting in steelmaking production, and in particular relates to a dolomite coating for a continuous casting tundish. Background technique [0002] The tundish is the intermediate storage of molten steel in the production of steelmaking and continuous casting, which plays the role of diversion, heat preservation, removal of inclusions, and continuous casting of multiple furnaces for molten steel. The quality of the paint used in the working layer of the tundish plays an important role in the quality of the steel. Therefore, the requirements for the coating used in the working layer of the tundish are: corrosion resistance, erosion resistance, good heat preservation, strong ability to remove inclusions, no pollution to molten steel, simple construction, good disintegration, and low cost. [0003] Most of the existing coatings for the working layer of the tundish use metallurgical magnesia as the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B7/32
Inventor 马立国黄玉平于赋志唐雪峰金百刚李平
Owner ANGANG STEEL CO LTD
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