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
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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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