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Magnesium-calcium-titanium-carbon brick and preparation method thereof

A magnesium-calcium-titanium-carbon brick and titanium dioxide technology, which is applied in the field of refractory materials for metallurgical refining ladles (refining furnaces), can solve the problems of short storage time, easy hydration, large change rate of reburning line, and poor thermal shock resistance. Achieve excellent anti-hydration performance, small change in reburning line, and improve anti-hydration effect

Inactive Publication Date: 2012-11-07
营口青花耐火材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a magnesia-calcium-titanium carbon brick and its preparation method, which overcomes the deficiencies of the prior art and solves the problem of poor thermal shock resistance and refiring of traditional magnesia-calcium-carbon bricks while retaining many advantages of magnesia-calcium-carbon bricks. Disadvantages of large line change rate, short storage time and easy hydration

Method used

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  • Magnesium-calcium-titanium-carbon brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] A magnesia-calcium-titanium-carbon brick of the present invention is composed of the following raw materials in proportion by weight percentage as follows: 74% of sintered dolomite sand, wherein: 30% of particle size greater than 3-5mm, 28% of greater than 1-3mm, 0.088-1mm 16%; fused magnesia 14%, particle size ≤ 0.088mm; expanded graphite 2%; asphalt powder 2%; anhydrous resin 3%; , Metal Si powder 0.5%, B 4 C powder 0.5%); rutile industrial titanium dioxide 3%.

[0051] See figure 1 , is the flow chart of the preparation method of the magnesium-calcium-titanium-carbon brick of the present invention, including mixing, compression molding, heat treatment, water-repellent treatment and vacuum packaging, and its specific operation steps are as follows:

[0052] 1) Crushing sintered dolomite sand and fused magnesia, the crushing equipment can choose jaw crusher, double roller crusher or impact crusher, and screen with rolling sieve. 3mm, 0.088~1mm three particle sizes a...

Embodiment 2

[0059] A magnesia-calcium-titanium-carbon brick of the present invention is composed of the following raw materials according to weight percentage: 64% of sintered dolomite sand, wherein: 28% of particle size greater than 3-5mm, 25% of greater than 1-3mm, 0.088-1mm 11%; fused magnesia 21%, particle size ≤ 0.088mm; graphite 4% (of which: flake graphite 2%, expanded graphite 2%); asphalt powder 2.5%; anhydrous resin 4%; urotropine 0.5%; Antioxidant 2% (of which: aluminum-magnesium alloy powder 1.5%, B 4 C powder 0.5%); rutile industrial titanium dioxide 2%. The preparation method is the same as in Example 1.

[0060] The product of Example 2 is used on the ladle slag line of the 80-ton LF furnace of domestic B steel plant, and the life of a single slag line is more than 90 times.

Embodiment 3

[0062] A magnesia-calcium-titanium-carbon brick of the present invention is composed of the following raw materials in proportion by weight percentage: 51% of sintered dolomite sand, of which: 21% of particle size greater than 3-5mm, 20% of greater than 1-3mm, 0.088-1mm 10%; fused magnesia 36%, of which 5% is larger than 3-5mm, 6% is larger than 1-3mm, 7% is larger than 0.088-1mm, 18% is ≤0.088mm; graphite 5% (of which: flake graphite 3%, expanded graphite 2%); asphalt powder 1%; anhydrous resin 3.5%; urotropine 0.5%; antioxidant 2% (of which: aluminum-magnesium alloy powder 1.5%, B 4 C powder 0.5%); rutile industrial titanium dioxide 1%.

[0063] The preparation method of the magnesia-calcium-titanium-carbon brick includes mixing materials, press molding, heat treatment, waterproofing treatment and vacuum packaging, and its specific operation steps are as follows:

[0064] 1) Crushing sintered dolomite sand and fused magnesia, the crushing equipment can choose jaw crusher, d...

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Abstract

The invention relates to the field of fireproof materials, particularly to a magnesium-calcium-titanium-carbon brick and a preparation method of the brick. The brick is characterized in comprising the following raw materials based on weight: sintered dolomite sand, fused magnesite, graphite, asphalt powders, anhydrous resin, urotropine, an antioxidant and industrial titanium dioxide. Compared with the prior art, the magnesium-calcium-titanium-carbon brick has the following beneficial effects: (1) the brick can be widely applied to various external refining devices such as LF (ladle furnace), VAD (vacuum arc degassing) furnace, VOD (vacuum oxygen decarburization) furnace, AOD (argon oxygen decarburization) furnace, RH (recirculation degassing) furnace, GOR (gas oxidation refining) furnace, ASEA-DKF and K-OBM-S, thereby having wide application value; (2) the brick can resist against corrosion, endure peeling, and has good high-temperature vacuum stability, and the product is small in re-burning line change, good in thermal shock stability, and not limited by intermittent usage conditions; (3) the product has excellent hydration resistance; and (4) the brick does not contain water or need any external water, so that the magnesium-calcium fireproof material can be effectively protected from hydration, and the brick is especially fit for matching with the magnesium-calcium fire brick.

Description

technical field [0001] The invention relates to the field of refractory materials for metallurgical refining ladles (refining furnaces), in particular to a magnesium-calcium-titanium-carbon brick and a preparation method thereof. Background technique [0002] With the development of the iron and steel industry, the conditions for the use of refractory materials are becoming increasingly harsh. The clean steel process requires strict control of the carbon content in refractory materials; the secondary refining process requires that the temperature of molten steel not drop too much, that is, the furnace lining is required to have low thermal conductivity. High-quality fired magnesia-chrome bricks have been widely used as the lining of refining equipment for a long time. However, due to the shortage of chromite resources in my country, most of them rely on imports, and the hexavalent chromium ions produced by the used magnesia-chrome bricks will pollute the environment. Major i...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 潘波李英陶玉婷高心魁
Owner 营口青花耐火材料股份有限公司
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