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Rare-earth modified aluminum nitrogen swing spout castables

A swing nozzle and rare earth modification technology, which is applied in the field of rare earth modified aluminum nitrogen swing nozzle castables, can solve the problems of short service life, easy cracking, poor erosion resistance, etc., to reduce costs and save energy consumption , The effect of extending the service life

Active Publication Date: 2012-07-11
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

[0003] The purpose of the present invention is to provide a rare earth modified aluminum nitrogen swing nozzle castable with good thermal shock stability, good slag resistance and oxidation resistance, high operation stability and long service life, so as to solve the problem of existing swing flow problems. Nozzle castables have poor slag resistance, poor erosion resistance, easy cracking, and short service life

Method used

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  • Rare-earth modified aluminum nitrogen swing spout castables
  • Rare-earth modified aluminum nitrogen swing spout castables

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A rare earth modified aluminum nitrogen swing nozzle castable, the weight percentage of the components contained in it is:

[0027] Corundum aggregate 65%, of which the mass ratio of fused corundum to sintered tabular alumina is 15:85, silicon carbide 15%, rare earth oxide 5% including La 2 o 3 , Y 2 o 3 , NdF 3 ,Nd 2 o 3 , 7% metal silicon, 8% binder, and 5% of the above total admixture, wherein the binder is α-Al 2 o 3 Micropowder 5%, cement 2% and silica fume 1%.

Embodiment 2

[0029] A rare earth modified aluminum nitrogen swing nozzle castable, the weight percentage of the components contained in it is:

[0030] Corundum aggregate 75%, of which the mass ratio of fused corundum to sintered tabular alumina is 22:78, 8% of silicon carbide with a particle size of less than 0.088mm and 0.5mm, 2% of rare earth oxides, and metallic silicon with a particle size of 35μm 7%, binder 8%, and additives accounting for 7% of the above total amount, of which the rare earth oxide is 0.5% La 2 o 3 , 0.5%Y 2 o 3 , 0.13%NdF 3 , 0.87%Nd 2 o 3 ; The binder is α-Al with a particle size of 0.5 μm 2 o 3 Micropowder 5%, cement 2% and silica fume 1%.

Embodiment 3

[0032] A rare earth modified aluminum nitrogen swing nozzle castable, the weight percentage of the components contained in it is:

[0033] Corundum aggregate 70%, of which the mass ratio of fused corundum to sintered tabular alumina is 18:82, 11% of silicon carbide with a particle size of less than 0.088mm and 0.5mm, 4% of rare earth oxides, and metallic silicon with a particle size of 50μm 3%, binder 12%, and admixtures of metal aluminum and sodium tripolyphosphate accounting for 6% of the above total amount, of which the rare earth oxide is 2.5% La 2 o 3 , 1.0%Y 2 o 3 , 0.37%NdF 3 , 0.13%Nd 2 o 3 ; The binder is α-Al with a particle size of 1.5 μm 2 o 3 Micropowder 5%, cement 4% and silica fume 3%.

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Abstract

The invention discloses rare-earth modified aluminum nitrogen swing spout castables, which comprise the following components in percentage by weight: 60 to 75 percent of corundum aggregate, 8 to 15 percent of silicon carbide, 2 to 5 percent of rare earth oxide, and 3 to 7 percent of silicon metal, 8 to 15 percent of bonding agent, as well as additional admixture which accounts for 5 to 7 percent of the total amount, wherein the mass ratio of electric corundum to fired tabular corundum in the corundum aggregate is 15:85-22:78; the rare-earth oxide comprises La2O3, Y2O3, NdF3 and Nd2O3; and the bonding agent comprises the following components in percentage by weight: 5 to 10 percent of alpha-Al2O3 micropowder, 2 to 4 percent of cement, and 1 to 3 percent of silica fume. The rare-earth modified aluminum nitrogen swing spout castables have excellent thermal shock resistance and good oxidation resistance and high operation stability; and compared with conventional castables, the iron output capacity is increased to 96000 tons from 70000tons, and the service life is greatly prolonged.

Description

technical field [0001] The invention relates to a swing nozzle castable for steelmaking, in particular to a rare earth modified aluminum nitrogen swing nozzle castable. Background technique [0002] The market demand for some high value-added steel products represented by clean steel is increasing day by day, which raises the requirements for hot metal pretreatment technology. The use of aluminum-carbon (high-strength high-temperature sintered prefabricated parts) aluminum-magnesium combination technology is more effective for desiliconization operations. With the country's emphasis on energy conservation and environmental protection, and with China's large-scale power construction, oriented silicon steel has high magnetic properties. Inductive, low iron loss and other characteristics, favored by users. Large domestic iron and steel companies began to smelt grain-oriented silicon steel, so they needed to provide demanganized molten iron. A large number of manganese removal ...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 许华佘春霞张文崔健健
Owner 长兴煤山新型炉料有限公司
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