Magnesium-calcium tundish dry vibrating material and preparation method thereof

A magnesium-calcium vibrating material technology, which is applied in the field of magnesium-calcium tundish dry vibrating material and its preparation, can solve the problem of affecting the metallurgical effect of materials, high-temperature performance, disintegration performance after use, weakening CaO purification function, and reducing the service life of materials, etc. Problems, to achieve the effect of good purification of molten steel, good heat preservation and purification of molten steel, and promotion of medium temperature sintering

Inactive Publication Date: 2011-09-14
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the decomposition of calcium-containing minerals such as limestone and dolomite at high temperature can produce a large amount of free CaO that is beneficial to the purification of molten steel, but it will destroy the material structure, reduce the service life of the material, and emit a large amount of CO 2 Pollution to the environment; while the passivation raw

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0011] Example 1

[0012] A magnesia-calcium tundish dry vibrating material and its preparation method: first mix 72-80wt% magnesia-calcium sand, 9-13wt% sintered magnesia and 8-14wt% hydrated sodium metasilicate, and then mix the above Stir the material uniformly, vibrate the fetal membrane, and then bake it at 160-240°C for 2-7 hours and demould.

[0013] In this embodiment: the CaO of the magnesia-calcium sand is less than or equal to 60wt%, the particle gradation of the magnesia-calcium sand is: 3~1mm is 45-60wt%, ≤1mm is 40~55wt%; the particle size of sintered magnesia is less than 0.088mm; Hydrated sodium metasilicate is a mixture of sodium metasilicate pentahydrate and sodium metasilicate nonahydrate.

Example Embodiment

[0014] Example 2

[0015] A magnesia-calcium tundish dry vibrating material and its preparation method: first mix 68-76wt% magnesia-calcium sand, 12-16wt% fused magnesia and 10-17wt% sodium metasilicate nonahydrate, and then mix The above mixture is stirred uniformly, the fetal film is vibrated and then baked at 100-180°C for 6-12 hours and demolded.

[0016] In this embodiment: the CaO of the magnesia-calcium sand is less than or equal to 60wt%, the particle gradation of the magnesia-calcium sand is: 3~1mm is 55~70wt%, ≤1mm is 30~45wt%; the particle size of fused magnesia is less than 0.088mm .

Example Embodiment

[0017] Example 3

[0018] A magnesia-calcium tundish dry vibrating material and a preparation method thereof: first mix 75-80wt% magnesia-calcium sand, 11-16wt% magnesia fine powder and 4-10wt% sodium metasilicate pentahydrate, and then mix The above-mentioned mixture is stirred uniformly, the fetal membrane is vibrated and then baked at 220-300°C for 4-10 hours and demolded.

[0019] In this embodiment: CaO of magnesia calcium sand≤60wt%, the particle size distribution of magnesia calcium sand is: 3~1mm is 45~60wt%, ≤1mm is 40~55wt%; the particle size of magnesia fine powder is less than 0.088mm The fine magnesia powder is a mixture of sintered magnesia and fused magnesia.

[0020] This embodiment is environmentally friendly, short baking time, fast baking without cracking and falling off; the prepared product meets the requirements of high calcification and heat preservation of the tundish lining, has high strength, has a good function of purifying molten steel, and is in use Goo...

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Abstract

The invention relates to a magnesium-calcium tundish dry vibrating material and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps of: mixing 68-80 percent by weight of magnesium-calcium sand, 9-16 percent by weight of magnesium sand fine powder and 4-17 percent by weight of hydrated sodium metasilicate; uniformly stirring the mixture; performing vibratory compaction on a tire membrane; baking at the temperature of 100-300 DEG C for 2-12 hours; and demolding, wherein the content of CaO of the magnesium-calcium sand is less than or equal to 60 percent by weight, the particle composition is 45-70 percent by weight when the particle size is 3-1 millimeter and 30-55 percent by weight when the particle size is less than or equal to 1 millimeter, the particle size of magnesium sand fine powder is less than 0.088 millimeter, the magnesium sand fine powder is more than one of sintered magnesium sand and electrically-molten magnesium sand, and the hydrated sodium metasilicate is more than one of sodium metasilicate pentahydrate and metasilicate nonahydrate. The vibrating material has a simple process, is environmentally-friendly and can be baked quickly. A prepared working lining has the characteristics of high intensity, high erosion resistance and long service life, and particularly has good heat preserving and molten steel purifying functions. The development requirement for clean steel smelting is met.

Description

technical field [0001] The invention belongs to the technical field of tundish dry vibration material. In particular, it relates to a magnesium-calcium tundish dry vibration material and a preparation method thereof. Background technique [0002] Magnesium-calcium refractories are high-temperature engineering materials that are compatible with clean steel smelting. They have no pollution to the environment and molten steel during production and use. Especially, CaO has good dephosphorization and desulfurization effects. In recent years, refractory materials and The iron and steel metallurgy industry has received extensive attention. The working lining of the tundish plays the role of high temperature resistance and slag erosion resistance in the continuous casting production process. With the increasing demand for high-quality steel such as clean steel, the tundish has become the final key link in molten steel refining. With the introduction of quick replacement nozzle tec...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 顾华志黄奥
Owner WUHAN UNIV OF SCI & TECH
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