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Method for preparing dry working lining

A technology of working lining and magnesia, which is applied in the direction of metal processing equipment, manufacturing tools, casting equipment, etc., to achieve the effect of easy disassembly, good corrosion resistance and environmental friendliness

Inactive Publication Date: 2009-01-21
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the shortage of existing dry-type materials, and provide a method for preparing a dry-type working lining of a tundish with the characteristics of low price, environmental friendliness, good corrosion resistance and easy disassembly.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In terms of weight percentage: 90% of sintered magnesia containing 95% of MgO, and 10% of citric acid. Wherein the gradation weight percentage of sintered magnesia particles is: 60-70% for 5-0.074mm, 30-40% for <0.074mm.

[0018] Mix the above-mentioned raw materials, stir them evenly, mold them by vibrating tires, bake them at 200-300°C, and get a tundish dry working lining after demoulding.

[0019] Its measured index: MgO is 84.3%, bulk density: 200℃×3h2.12g / cm 3 , Compressive strength: 200℃×3h 4.1MPa; 1500℃×3h8.6MPa; line change rate: 1500℃×3h-1.8%. The dry material is used on a 32-ton tundish with a service life of more than 24 furnaces, and it is easy to turn over and disassemble.

Embodiment 2

[0021] In terms of weight percentage: 92% of sintered magnesia containing 97% of MgO, and 8% of glucose. Wherein the gradation weight percentage of sintered magnesia particles is: 60-70% for 5-0.074mm, 30-40% for <0.074mm.

[0022] Mix the above-mentioned raw materials, stir them evenly, mold them by vibrating tires, bake them at 200-300°C, and get a tundish dry working lining after demoulding.

[0023] Its measurement index: MgO is 89.5%, bulk density: 200℃×3h2.16g / cm 3 , Compressive strength: 200℃×3h 6.2MPa; 1500℃×3h8.3MPa; line change rate: 1500℃×3h-1.2%. The dry material is used on a 32-ton tundish with a service life of more than 24 furnaces, and it is easy to turn over and disassemble.

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Abstract

The present invention relates to amorphous refractory material producing technology, and is especially process of producing dry lining for pouring basket. The technological scheme is that the dry lining for pouring basket is produced with magnesia in 85-95 wt% and glucose or citric acid in 5-15 wt%, and through mixing, vibration forming in mold, roasting at 200-400 deg.c, and demolding to obtain dry lining for pouring basket. The dry lining is used mainly in continuous casting pouring basket, and has the features of low cost, environment friendship, high erosion resistance, easy disintegration, etc.

Description

Technical field: [0001] The invention relates to the technical field of monolithic refractories, in particular to a method for preparing a tundish dry-type working lining. Background technique: [0002] The tundish is the intermediate storage where molten steel is diverted from the ladle to the crystallizer in the process of steelmaking and continuous casting, and it is very important to ensure clean steelmaking and multi-furnace continuous casting. The quality of refractory materials for tundish plays an important role in eliminating inclusions in molten steel, maintaining the stability of steel flow and improving the quality of continuous casting steel. Requirements for refractory materials used in the working layer of the tundish are: corrosion resistance, erosion resistance, good heat preservation, no pollution to molten steel, easy construction and unpacking, etc. [0003] At present, the working lining of the tundish has changed from silicon insulation boards to magne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D41/02C04B35/04
Inventor 魏军从涂军波
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY