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Tundish diffuse type air brick and preparation method thereof

A technology of breathable bricks and tundishes, which is applied in the field of tundish diffused breathable bricks and its preparation, which can solve the problems of polluting molten steel, increasing production costs, and increasing emissions, and achieves strong corrosion resistance, low cost, and no pollution emissions. Effect

Active Publication Date: 2014-05-14
TANGSHAN GUOLIANG SPEICAL REFRACTORY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that the current tundish diffused breathable bricks are mostly made of corundum mullite and magnesia in terms of materials, and they are all prepared by high-temperature firing; a large amount of fuel is consumed in the high-temperature firing process, which not only increases production costs, but also increases In addition, the aluminum-silicon permeable brick may pollute the molten steel during use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: This tundish diffused air permeable brick is prepared by using the following raw materials and methods.

[0017] Raw material weight ratio: forsterite 2~1mm: 10%, 1~0.5mm: 20%, 0.5~0mm: 50%, 95 sintered magnesia fine powder with particle size less than 0.088mm: 10%, silicon nitride fine powder : 5%, forsterite micropowder: 3%, 95 silica micropowder: 2%; plus 0.15% phosphate superplasticizer of the above raw materials. Among them, the chemical composition of forsterite particles is MgO+SiO 2 >87wt%, Al 2 o 3 2 o 3 3 N 4 >90wt%, particle size 2 >97%, Fe 2 o 3 <1.0%, particle size <5μm.

[0018] Preparation method: Weigh the ingredients, mix them evenly, add about 10% of clean tap water, stir evenly, pour into molding, curing, first dry at 110°C, and then bake at 250°C for 12 hours. The performance indicators are as follows: after baking at 250℃×12h, the bulk density is 2.38g / cm 3 , the apparent porosity is 27.0%, the compressive strength is 15MPa, a...

Embodiment 2

[0019] Embodiment 2: This tundish diffused air permeable brick is prepared by using the following raw materials and methods.

[0020] Raw material weight ratio: forsterite 2~1mm: 30%, 1~0.5mm: 20%, 0.5~0mm: 10%, 95 fused magnesia with a particle size of 1~0mm: 20%, 95 electric magnesia less than 0.088mm Fused magnesia fine powder: 10%, silicon nitride fine powder: 2%, forsterite fine powder: 1%, 95 silicon fine powder: 7%; plus 0.15% phosphate superplasticizer of the above raw materials. Among them, the chemical composition of forsterite particles is MgO+SiO 2 >87wt%, Al 2 o 3 2 o 3 3 N 4 >90wt%, particle size 2 >97%, Fe 2 o 3 <1.0%, particle size <5μm.

[0021] Preparation method: Weigh the ingredients, mix them evenly, add about 8% of clean tap water, stir evenly, pour into molding, curing, first dry at 110°C, and then bake at 250°C for 12 hours. The performance indicators are as follows: after baking at 250℃×12h, the bulk density is 2.52g / cm 3 , the apparent porosi...

Embodiment 3

[0022] Embodiment 3: This tundish diffused air permeable brick is prepared by using the following raw materials and methods.

[0023] Raw material weight ratio: forsterite 2~1mm: 10%, 1~0.5mm: 40%, 0.5~0mm: 20%, 95 fused magnesia with a particle size of 1~0mm: 5%, 95 electric magnesia less than 0.088mm Fused magnesia fine powder: 12%, silicon nitride fine powder: 7%, forsterite fine powder: 5%, 95 silicon fine powder: 1%; plus 0.15% phosphate superplasticizer of the above raw materials. Among them, the chemical composition of forsterite particles is MgO+SiO 2 >87wt%, Al 2 o 3 2 o 3 3 N 4 >90wt%, particle size 2 >97%, Fe 2 o 3 <1.0%, particle size <5μm.

[0024] Preparation method: Weigh the ingredients, mix them evenly, add about 10% of clean tap water, stir evenly, pour into molding, curing, first dry at 110°C, and then bake at 250°C for 12 hours. The performance indicators are as follows: after baking at 250℃×12h, the bulk density is 2.40g / cm 3 , the apparent porosi...

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Abstract

The invention discloses a tundish diffuse type air brick and a preparation method thereof. The brick is mainly prepared by adopting the following raw materials in percentage by weight: 60-80% of forsterite particle, 10-30% of magnesia fine powder, 1-7% of silicon micro powder, 2-7% of silicon nitride fine powder and 1-5% of forsterite micro powder. The air brick adopts forsterite as the main raw material and has the characteristics of low cost, good air permeability, strong anti-erosion ability, uniform and stabile bubble, no pollution on liquid steel and high cost performance; the air brick can be prepared through low temperature baking only and the fuel consumption in the high temperature baking process is avoided, so that the production cost is reduced and the air brick has the characteristics of environmental protection and energy saving in the production process. The method comprises the steps of mixing according to requirement, adding water and stirring, casting and moulding, maintaining and drying. The air brick is obtained through the low temperature baking only with on need for high temperature baking, so that the method has the characteristics of environmental protection, energy saving and no pollution.

Description

technical field [0001] The invention relates to an unshaped refractory material, in particular to a tundish dispersed air brick and a preparation method thereof. Background technique [0002] In recent years, with the research and application of clean steel smelting technology, the purification process of molten steel in the tundish has become a key link to improve the cleanliness of molten steel. For this reason, blowing inert gas into the tundish has become an important and effective way to purify molten steel and improve the purity of molten steel. The invention patent with the publication number CN1699267A discloses a tundish breathable brick and its preparation method. The tundish breathable brick is made of aluminosilicate, using 76-85% corundum, 5-20% mullite, 2-10 % binder, 1-5% silica powder, plus 5-20% mullite xerogel powder, 1-5% AlF 3 , pouring, drying, and firing at a high temperature of 1200 ° C to 1400 ° C. The invention patent with the publication number C...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 王义龙魏军从马伟平张连进涂军波张宏进杨强
Owner TANGSHAN GUOLIANG SPEICAL REFRACTORY MATERIAL
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