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Method for preparing nozzle bricks for metallurgical casting

A technology for nozzle bricks and preparation steps, which is applied in the field of preparation of metallurgical casting nozzle bricks, which can solve the problems of reduced slag erosion resistance, poor thermal shock resistance stability, and low strength of nozzle bricks, and achieves improved penetration resistance and heat resistance. Excellent shock resistance and the effect of improving the service life

Inactive Publication Date: 2017-08-04
石磊
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention: aiming at the defects of poor high-temperature oxidation resistance of the existing nozzle bricks, which easily lead to loose structure and a significant drop in slag erosion resistance, and the nozzle bricks have low strength and poor thermal shock resistance, Provided is a method for preparing metallurgical cast nozzle bricks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Weigh 90g of zircon, 10g of bauxite, and 32g of anthracite, put them into a ball mill, mill at 300r / min for 1h, pass through a 200-mesh sieve, put the sieved composite powder into a muffle furnace, , heated to 1500°C and kept calcined for 3 hours, cooled to room temperature, put it into a grinder for grinding, passed through a 200-mesh sieve, and obtained zirconium nitride-based ceramics, weighed 3kg of white corundum, put it into a grinder for grinding, and then transferred to a vibrating sieve In the machine, powders with a particle size of 1mm, 0.74mm, and 0.45mm were screened out respectively to obtain white corundum with different particle sizes. Weighed 210g of white corundum with a particle size of 1mm, 420g of white corundum with a particle size of 0.74mm, and 420g of white corundum with a particle size of 0.45mm white corundum, mixed evenly to obtain graded white corundum, and then weighed 100 parts of graded white corundum, 100 parts of fused magnesia passed th...

example 2

[0021] Weigh 99g of zircon, 11g of bauxite, and 34g of anthracite, put them into a ball mill, mill at 350r / min for 1h, pass through a 200-mesh sieve, put the sieved composite powder into a muffle furnace, , heated to 1550°C and kept calcined for 3 hours, cooled to room temperature, put it into a grinder for grinding, passed through a 200-mesh sieve, and obtained zirconium nitride-based ceramics, weighed 3kg of white corundum, put it into a grinder for grinding, and then transferred to a vibrating sieve In the machine, powders with a particle size of 2mm, 0.87mm, and 0.61mm were screened out respectively to obtain white corundum with different particle sizes. Weighed 230g of white corundum with a particle size of 2mm, 460g of white corundum with a particle size of 0.87mm, and 460g of white corundum with a particle size of 0.61mm white corundum, mixed evenly to obtain graded white corundum, and then weighed 110 parts of graded white corundum, 110 parts of fused magnesia passed th...

example 3

[0023] Weigh 108g of zircon, 12g of bauxite, and 35g of anthracite, put them into a ball mill, mill at 400r / min for 2 hours, pass through a 200-mesh sieve, put the sieved composite powder into a muffle furnace, and put it in a nitrogen atmosphere. , heated to 1600°C and kept calcined for 4 hours, cooled to room temperature, put it into a grinder for grinding, passed through a 200-mesh sieve to obtain zirconium nitride-based ceramics, weighed 4kg of white corundum, put it into a grinder for grinding, and then transferred to a vibrating sieve In the machine, powders with a particle size of 3mm, 1.00mm, and 0.74mm were screened out respectively to obtain white corundum with different particle sizes. Weighed 250g of white corundum with a particle size of 3mm, 500g of white corundum with a particle size of 1.00mm, and 500g of white corundum with a particle size of 0.74mm white corundum, mixed evenly to obtain graded white corundum, and then weighed 120 parts of graded white corundum...

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Abstract

The invention discloses a method for preparing nozzle bricks for metallurgical casting, and belongs to the field of technologies for preparing nozzle bricks. The method includes carrying out mixed-milling and sieving on zircon, bauxite and anthracite and then carrying out heat-insulation calcination treatment on the zircon, the bauxite and the anthracite; grinding and sieving the zircon, the bauxite and the anthracite to obtain zirconium nitride-based ceramics, grinding white corundum, carrying out vibration screening on the white corundum to obtain gradation white corundum, then mixing the gradation white corundum, fused magnesia, the zirconium nitrate-based ceramics and the like with one another to obtain mixtures, then placing the mixtures in a hydraulic press and then compressing the mixtures to obtain rough nozzle brick bodies; carrying out forced-air drying on the rough nozzle brick bodies, then transferring the rough nozzle brick bodies into a rotary kiln and firing the rough nozzle brick bodies to obtain multi-phase fireproof materials; cooling the multi-phase fireproof materials to obtain the nozzle bricks for metallurgical casting. The method has the advantages that the nozzle bricks prepared by the aid of the method are high in structural strength and excellent in oxidation resistance, corrosion resistance, thermal shock resistance and high-temperature abrasion resistance; crack can be prevented in service procedures, the nozzle bricks are safe and durable, and the service lives of the nozzle bricks can be effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of refractory preparation, and in particular relates to a method for preparing a metallurgical casting nozzle brick. Background technique [0002] With the rapid development of the iron and steel industry and the gradual improvement of the current operating status crisis of the entire industry, the conditions for the use of bricks for tundish sizing nozzles and tundish upper nozzles have become increasingly harsh. In order to increase the life of the nozzle brick, that is, when the nozzle brick is in contact with molten steel, it is necessary to prevent it from reacting with molten steel and slag. The damage of nozzle bricks is not only due to the chemical action of molten steel and steel slag, but also due to physical actions such as cracks and spalling caused by rapid thermal shock of molten steel and wear of molten steel. Therefore, in order to enable the nozzle brick to operate stably, refractory materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043C04B35/103
Inventor 石磊杨阳孙冬
Owner 石磊
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