Tundish magnesium dry-type stock adding aluminum hydroxide

A technology of aluminum hydroxide and tundish, which is applied in the field of refractory materials, can solve problems such as toxic fumes, achieve the effects of reducing residual expansion, avoiding carburization, and easy unpacking

Active Publication Date: 2009-05-06
江苏苏嘉集团新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the previous products, the service life of the magnesium dry vibra

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Formula: sintered magnesia (particle diameter or particle size 3 ~ 1mm) 40%, fused magnesia (particle size 3 Content ≥ 98%) 12%, aluminum hydroxide powder (particle size 0.2mm, Al(OH) 3 Content ≥ 90%) 3%, boric acid (200 mesh) 1.5%, silica fume 1.5%.

[0026] Put the above-mentioned materials into the planetary wheel mill mixer after weighing, mix for > 8 minutes, and then put them into double-layer bags to prevent moisture absorption.

[0027] The dry material adopts vibration forming construction. A small amount of water can be added to the dry material before construction to wet the surface and prevent ash. Then add the product of the present invention to the permanent lining of the tundish and the tire mold, and adopt the process of adding layer by layer and forming by vibration. After knotting, the tire mold is heated, and the tire mold is heated to more than 195°C, and the aluminum hydroxide micropowder decomposes to release water and activated alumina. Boric a...

Embodiment 2

[0030] Formula: 32.5% sintered magnesia (particle size 3~1mm), 50% fused magnesia (particle size3 Content ≥ 98%) 1%, water glass powder (sodium silicate, 150 mesh) 1.5%, silica fume 1%, rosin powder 4%.

[0031] Put the above-mentioned materials into the planetary wheel mill mixer after weighing, and put them into double-layer bags after mixing for more than 8 minutes to prevent moisture absorption. Construction by dry vibration forming

[0032] Product technical performance indicators: chemical composition: MgO≥75%; bulk density (280℃12h)≥2.20g / cm 3 ; Compressive strength: (280°C, 12h) ≥ 8MPa; (1500°C, 3h) ≥ 20MPa; linear change rate: (1500°C, 3h) ± 1.5%.

[0033]Construction: Add the invented product to the permanent lining of the tundish and the tire mold, and adopt the process of adding layer by layer and vibrating layer by layer. Heat the mold. The tire mold is heated to over 175°C, the rosin melts and wets the dry material. When heated to over 195°C, the aluminum hyd...

Embodiment 3

[0035] Formula: 35% sintered magnesia (particle size 3~1mm), 54% fused magnesia (particle size3 Content ≥ 99%) 6%, sodium tripolyphosphate 1%, silica fume 1%, bentonite 2%. Put the above-mentioned materials into the planetary wheel mill mixer after weighing, and put them into double-layer bags after mixing for more than 8 minutes to prevent moisture absorption.

[0036] Construction: Add the invented product to the permanent lining of the tundish and the tire mold, and adopt the process of adding layer by layer and vibrating layer by layer. After knotting, pour a small amount of water along the tire mold, and then heat the tire mold. When the tire mold is heated to over 195°C, the aluminum hydroxide micropowder decomposes and releases a large amount of water and activated alumina. At high temperature, silica fume reacts with magnesia in the presence of water to form a binding force. Bentonite absorbs moisture and plays a binding role. At the same time, sodium tripolyphospha...

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Abstract

The invention discloses a magnesia-based dry material for a tundish with aluminum hydroxide, which belongs to a refractory material. The magnesia-based dry material for the tundish with the aluminum hydroxide comprises the following compositions in percentage by weight: 1 to 15 percent of aluminum hydroxide fine powder, 82 to 89 percent of magnesia, and 1.5 to 6.5 percent of bonding agent. During the baking and use, the aluminum hydroxide fine powder is decomposed to produce activated alumina and vapor, the vapor moistens the surfaces of particles inside the dry material to ensure that the surfaces of the magnesia and silica fume in the dry material are hydrated, and the bonding agent is partially dissolved and diffused to bond with the surface of the magnesia. The generated activated alumina has a spinel reaction with magnesia fine powder at a temperature higher than 900 DEG C to form a large quantity of fine magnesium aluminate spinels, which remarkably improves the penetration-resistant action of the dry material on molten steel and steel slag and plays a role in ceramic bonding. The dry material does not depend on carbon-containing bonding agents such as phenolic resin, asphalt, which avoids the carburization to molten steel of low carbon steel and also reduces the poisonous fume emission. The construction of the magnesia-based dry material adopts a dry-press process, and then the dry material is subjected to heat conduction through the heating on a metal mold to make the bonding agent fused or solidified to form a fixed tundish working lining for receiving the molten steel.

Description

technical field [0001] The invention belongs to a refractory material, in particular to a magnesium dry material for steelmaking and continuous casting tundish. Background technique [0002] The tundish is a device used for the transition of molten steel between the ladle and the crystallizer. Its main tasks are: 1. Divide the molten steel; 2. Stabilize the flow; 3. Store the molten steel; 4. Purify the molten steel. The development of continuous casting technology has more and more stringent requirements for refractory materials. Generally, tundish refractory materials should meet the following conditions: 1. Resistance to corrosion by molten steel and slag; 2. Good thermal shock stability; 3. Low heat conduction Heat rate and small thermal expansion; 4. Little pollution to molten steel; 5. Easy to build and disassemble. [0003] The working lining of the tundish used to generally use thermal insulation boards and magnesium smears, but the service life was short. Later, m...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 张雪松俞晓东朱光永
Owner 江苏苏嘉集团新材料有限公司
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