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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 materials prevent the hydration of CaO, it also greatly weakens the purification function of CaO in the material, which significantly affects the metallurgical effect, high-temperature performance and disintegration performance of the material
Therefore, the further promotion of magnesium-calcium dry vibrating materials in clean steel and even ultra-clean steel smelting is restricted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A magnesia-calcium tundish dry vibration 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 The materials are stirred evenly, the membrane is formed by vibration, and then baked at 160-240°C for 2-7 hours, and demoulded.

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

Embodiment 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-mentioned mixture is stirred evenly, the membrane is formed by vibration, and then baked at 100-180° C. for 6-12 hours, and demolded.

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

Embodiment 3

[0018] A magnesia-calcium tundish dry vibrating material and its preparation method: 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 evenly, the membrane is formed by vibration, and then baked at 220-300° C. for 4-10 hours, and demolded.

[0019] In this embodiment: CaO≤60wt% of magnesia-calcium sand, the particle gradation 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 , Magnesia fine powder is a mixture of sintered magnesia and fused magnesia.

[0020] This specific embodiment is environmentally friendly, the baking time is short, and there is no bursting and falling off during rapid baking; 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 us...

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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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