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Aluminum nitrogen demanganization swing spout castable

A technology of swing nozzle and castable, applied in the field of refractory materials, can solve the problems of increased labor intensity, decreased life of swing nozzle, affecting the turnaround time of iron mouth and so on.

Active Publication Date: 2012-07-04
长兴煤山新型炉料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since 2007, the production of Baosteel’s silicon steel plant has implemented the nine-determined principle. The No. 3 blast furnace, as the first choice for providing oriented silicon steel molten steel to the No. 2 steelmaking plant, has carried out many demanganization tests, and since 2008, all desiliconization agents have been replaced with manganese removal agents. , the erosion of the swing nozzle by spraying manganese removal agent is more serious, the phenomenon of slag resistance, poor erosion resistance and easy cracking appear in the swing nozzle, the service life of the swing nozzle plummets, and the amount of iron passing through is only 4.5 About 10,000 tons
The decline in the life of the swing nozzle not only requires an increase in the number of repairs, which affects the turnaround time of the tap hole, but also increases the labor intensity of spot inspection and repair. If the arrangement is not good, it may also affect the production of molten silicon steel, and it also brings risks and potential safety hazards. Once the swing burns through, the consequences will be very serious

Method used

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  • Aluminum nitrogen demanganization swing spout castable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1, fused dense corundum 5-8mm: 14%; brown corundum 3-5mm: 22%; tabular corundum 1-3mm: 18%; activated alumina powder <3um: 11%; silicon carbide 1-3mm: 8%; silicon carbide 45um: 3%; spherical pitch: 5%; silicon nitride: 7%; ferrosilicon nitride: 5%; metal powder: 1%; sodium hexametaphosphate: 0.6%; %; explosion-proof agent: 3%; silicon powder: 2%.

Embodiment 2

[0021] Example 2, fused dense corundum 5-8mm: 12%; brown corundum 3-5mm: 22%; tabular corundum 1-3mm: 18%; activated alumina powder <3um: 13%; silicon carbide 1-3mm: 5%; silicon carbide 45um: 6%; spherical pitch: 5%; silicon nitride: 7%; ferrosilicon nitride: 5%; metal powder: 1%; sodium hexametaphosphate: 0.6%; %; explosion-proof agent: 2.5%; silicon powder: 2.5%.

Embodiment 3

[0022] Example 3, fused dense corundum 5-8mm: 15%; brown corundum 3-5mm: 19%; tabular corundum 1-3mm: 17%; activated alumina powder <3um: 10%; silicon carbide 1-3mm: 8%; silicon carbide 45um: 6%; spherical pitch: 5%; silicon nitride: 6.5%; ferrosilicon nitride: 4%; metal powder: 1%; sodium hexametaphosphate: 0.8%; %; explosion-proof agent: 4%; silicon powder: 3%.

[0023] The invention selects composite corundum aggregate and high-quality SiC to improve the thermal shock resistance stability and erosion resistance of the pouring material. In order to prevent SiC from being oxidized, Al 2 o 3 -Add Si to SiC-C castable 3 N 4 (silicon nitride), Si, and Al 2 o 3 The SiAlON (Sialon) matrix binding form generated by the in situ reaction improves the solid-solid direct binding rate of the matrix; adding FeSi 3 N 4 (ferrosilicon nitride), high temperature forms a melt covering the surface of the material to prevent silicon carbide and carbon from being oxidized. Add non-metal...

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Abstract

The invention discloses aluminum nitrogen demanganization swing spout castable, which comprises electric smelting densified corundum, brown fused alumina, tabular corundum, activated alumina powder, silicon carbide, ball pitch, silicon nitride, metal powder, sodium hexametaphosphate, coagulant, detonation inhibitor, silica powder and ferro-silicon nitride. In order to prevent SiC from being oxidized, Si3N4 and Si are added in Al2O3-SiC-C castable, and a SiAlON matrix generated by Al2O3 in-suit reaction is combined to improve solid-solid direct bonding rate of the matrix. In addition, FeSi3N4 is added, a fondant covered on the surface of a material is formed at high temperature, so that the silicon carbide and carbon are prevented from being oxidized.

Description

technical field [0001] The present invention relates to refractory technology. Background technique [0002] The existing manganese removal swing nozzle adopts aluminum-carbon (high-strength high-temperature sintered prefabricated parts) aluminum-magnesium combination technology. Since 2007, the production of Baosteel’s silicon steel plant has implemented the nine-determined principle. The No. 3 blast furnace, as the first choice for providing oriented silicon steel molten steel to the No. 2 steelmaking plant, has carried out many demanganization tests, and since 2008, all desiliconization agents have been replaced with manganese removal agents. , the spraying of manganese removal agent to the scouring of the oscillating nozzle is more serious, the slag resistance, poor anti-scouring performance, easy to crack and other phenomena appear in the oscillating nozzle, the life of the oscillating nozzle plummets, and the amount of iron passing through is only 4.5 About ten thousa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 张文
Owner 长兴煤山新型炉料有限公司
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