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Refractory castable for converter sublance and preparation method of refractory castable

A technology for refractory castables and guns. It is applied in the field of metallurgical materials. It can solve the problems of large impact on service life, high high temperature flexural strength, and general thermal shock resistance. It achieves good thermal shock resistance, good fluidity, The effect of excellent thermal shock resistance

Active Publication Date: 2020-09-29
CHINA FIRST METALLURGICAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This material has high high temperature flexural strength and low thermal expansion rate, but its thermal shock resistance is average, which has a great impact on its service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] With 50-52wt% mullite particles and 20-22wt% cordierite particles as aggregates, 15-20wt% mullite fine powder, 3.5-7wt% calcium aluminate cement, 1-3wt% simple Si powder and 7-9wt% α-Al 2 o 3 Micropowder is the base material; first mix the base material, then add the aggregate into the mixed base material, mix evenly to obtain a mixture; then add 4.5 to 4.5% of the mixture to the mixture 5.3wt% water, stirred for 4-5 minutes, to prepare the refractory castable for converter sub-lance.

[0043] The refractory castable for the converter sub-lance prepared in this example is tested: the bulk density is 2.93-3.08g / cm 3;The apparent porosity is 14.5~16.7%; the flexural strength is 8.5~9.9MPa; The erosion index of the crucible slag resistance test is 15.4% to 19.7%.

Embodiment 2

[0045] With 51-53wt% mullite particles and 20-22wt% cordierite particles as aggregates, 15-19wt% mullite fine powder, 3.5-7wt% calcium aluminate cement, 1-3wt% simple Si powder and 7-9wt% α-Al 2 o 3 Micropowder is the base material; firstly mix the base material, then add the aggregate into the mixed base material, mix evenly to obtain a mixture; then add 4.5 to 4.5% of the mixture to the mixture 5.5wt% water, stirred for 4 to 5 minutes, to prepare the refractory castable for the converter sub-lance.

[0046] The refractory castable for the converter sub-lance prepared in this example is tested: the bulk density is 2.97-3.10g / cm 3 The apparent porosity is 14.5-16.0%; the flexural strength is 8.8-9.9MPa; the compressive strength is 65.45-69.32MPa; the flexural strength retention rate of 1000℃ water cooling for 3 thermal shocks is 66%-70%; 1550℃ static The erosion index of the crucible slag resistance test is 15.4% to 18.5%.

Embodiment 3

[0048] With 52-54wt% mullite particles and 20-22wt% cordierite particles as aggregates, 14-19wt% mullite fine powder, 4-7wt% calcium aluminate cement, 2-3wt% simple Si powder and 7-10wt% α-Al 2 o 3 Micropowder is the base material; firstly mix the base material, then add the aggregate into the mixed base material, mix evenly to obtain a mixture; then add 5-5% of the mixture to the mixture 5.5wt% water, stirred for 4 to 5 minutes, to prepare the refractory castable for the converter sub-lance.

[0049] The refractory castable for converter sub-lance prepared in this example is tested: the bulk density is 3.00-3.15g / cm 3 The apparent porosity is 15.0-17.0%; the flexural strength is 9.8-10.2MPa; the compressive strength is 67.45-70.32MPa; the flexural strength retention rate of 1000°C water cooling for 3 thermal shocks is 67%-70%; 1550°C static The erosion index of crucible slag resistance test is 15.4%-19.5%.

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Abstract

The invention discloses a refractory castable for a converter sublance. The refractory castable comprises the following components in percentage by mass: 50-55wt% of mullite particles; 17 to 22 wt% ofcordierite particles; 17 to 22 weight percent of mullite fine powder; 3-7 wt% of calcium aluminate cement; 1-3 wt% of elemental Si powder; 7 to 10 weight percent of alpha-Al2O3 micro powder; and water accounting for 4.5-5.5 wt% of said components. The invention has the characteristics of low cost and simple process; the prepared refractory castable for the converter sublance is high in volume density, high in normal-temperature strength, excellent in thermal shock resistance and good in slag corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, and in particular relates to a refractory castable for a converter sub-lance and a preparation method thereof. Background technique [0002] With the continuous development of iron and steel metallurgy technology, the degree of automation and intelligence in the iron and steel industry has been continuously improved, and the converter sub-lance system has been promoted and popularized. The sub-lance system of the converter enters the interior of the high-temperature molten pool through the sub-lance to detect information changes inside the converter. At present, the sub-lance gun body used in the converter sub-lance system adopts a circulating cooling water structure to ensure that the internal cables of the gun body are not damaged by high temperature, but the circulating cooling water system has high operating costs, takes up a large space, and has great safety hazards (water se...

Claims

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Application Information

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IPC IPC(8): C04B35/66
CPCC04B35/66C04B2235/9607C04B2235/428C04B2235/3463C04B2235/3481C04B2235/77C04B2235/96C04B2235/9669Y02P10/20
Inventor 蔡玮程水明项冰丛培源
Owner CHINA FIRST METALLURGICAL GROUP
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