Machine pressing carbon-free lining brick for steel ladles

A ladle and lining brick technology, which is applied in the field of machine-pressed carbon-free lining bricks for ladles, can solve the increasingly stringent requirements and cannot meet the smelting requirements of low-carbon steel and ultra-low carbon steel, etc., and achieve long service life and high thermal strength , the effect of high compressive strength

Inactive Publication Date: 2015-01-14
JINAN IRON & STEEL GRP REFRACTORY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For decades, refractory materials for steelmaking converters, electric furnaces, ladles and other furnace linings, such as magnesia carbon bricks, aluminum magnesia carbon bricks, and functional refractory materials for continuous casting systems, such as aluminum carbon, aluminum zirconium carbon nozzles, slides, plugs Carbon-containing refractory materials such as rods have always played an important role in the steelmaking process. However, after entering the 21st century, due to the development and technological progress of countries in the world in defense, transportation, petroleum and automobile industries, the requirements for steel properties are increasing. Harsh, the existing refractory materials can no longer meet the smelting requirements for low carbon steel and ultra-low carbon steel

Method used

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  • Machine pressing carbon-free lining brick for steel ladles
  • Machine pressing carbon-free lining brick for steel ladles
  • Machine pressing carbon-free lining brick for steel ladles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] In terms of weight percentage, mix 20% brown corundum particles, 28% first white corundum particles, and 12% second white corundum particles together and put them into a mixing mill, add 2% aluminum sulfate, and mix and grind for 5 Minutes, then add 10% alumina micropowder and 15% white corundum powder in turn, mix and grind for 5 minutes, then add 1% aluminum sulfate, carry out continuous mixing and milling for 12 minutes, then place it in the silo, and close it for 4 hours. Then use a 630-ton friction brick press to form. When forming, pour the carbon-free lining mud into the cavity of the brick machine. The material is evenly distributed. The first hammer is lightly hit, and the mold does not come out, because the brick has not yet been formed at this time, and the strength of the brick is low; At this time, hit the second hammer with a heavy hammer, and release the mold at the same time to exhaust the air; use the third hammer with a light hammer, because if you use ...

Embodiment 2

[0019] In terms of weight percentage, mix 21.5% of the brown corundum particles, 29% of the first white corundum particles, and 12.5% ​​of the second white corundum particles together and put them into a mixing mill, add 3% of aluminum sulfate, and mix and grind for 5 Minutes, then add 10.5% alumina micropowder and 16.5% white corundum powder in turn, mix and grind for 5 minutes, then add 1.5% aluminum sulfate, carry out continuous mixing and grinding for 12 minutes, then place it in the silo, and close it for 4 hours. Then use a 630-ton friction brick press to shape it, and then seal it in an infrared drying kiln, dry it at 220° C. for 48 hours, and then cool it to room temperature. Other process conditions are the same as in Example 1.

[0020] 10 samples were randomly taken from the carbon-free lining bricks made in Example 2, and were tested for density, normal temperature compressive strength, 1500°C compressive strength and 1500°C linear change, and compared with existing...

Embodiment 3

[0024] In terms of weight percentage, mix 23% of the brown corundum particles, 30% of the first white corundum particles, and 15% of the second white corundum particles together and put them into a mixing mill, add 4% of aluminum sulfate, and mix and grind for 5 Minutes, then add 12% alumina micropowder and 18% white corundum powder in turn, mix and grind for 5 minutes, then add 2% aluminum sulfate, carry out continuous mixing and milling for 12 minutes, then place it in the silo, and close it for 4 hours. Then use a 630-ton friction brick press to shape it, and then seal it in an infrared drying kiln, dry it at 250° C. for 48 hours, and then cool it to room temperature. The other process conditions are the same as in Example 1.

[0025] 10 samples were randomly taken from the carbon-free lining bricks made in Example 3, and were tested for density, normal temperature compressive strength, 1500°C compressive strength and 1500°C linear change, and compared with existing magnesia...

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Abstract

The invention discloses a machine pressing carbon-free lining brick for steel ladles, which comprises the following components (according to weight percentage): 20-24% of brown aluminium oxide particle, 28-30% of first white alundum particle, 12-16% of second white alundum particle, 15-20% of white alundum powder, 10-12% of alumina micro powder, and 3-6% of efficient binding agent, wherein the diameter of the brown aluminium oxide particle is 3-5 mm, the diameter of the first white alundum particle is 3-5 mm, and the diameter of the second white alundum particle is 0-1 mm. The invention has the benefits that (1) the machine pressing carbon-free lining brick is free from carbon, and in the steel smelting process, carbon in steel is not increased, so that the smelting requirements of low-carbon steel and ultra-low carbon steel are met; (2) an effective binding agent (aluminum sulfate) is adopted as an inorganic binding agent, has higher thermal state strength, and can ensure that the thermal state strength is higher within the range from normal temperature to high temperature, and the low smelting phase is not generated; and (3) compared with a conventional fireproof material, the machine pressing carbon-free lining brick has the characteristics of high density, high compression strength and long service life.

Description

technical field [0001] The invention relates to a refractory material, in particular to a machine-pressed carbon-free lining brick for a ladle. Background technique [0002] With the continuous increase of our country's demand for various high-quality steel types, such as the rapid development of the automobile industry, the demand for low-carbon high-strength steel plates has increased sharply. Carbon is becoming more and more important, and it is required to minimize the use of carbon-containing refractory materials in the process of smelting low-carbon high-quality steel, so as to reduce the adverse effects of carbon increase on molten steel. In order to meet the requirements of iron and steel metallurgical technology, refractory products are gradually transformed into high-efficiency, energy-saving, and environmentally friendly products. The development and application of carbon-free refractory materials for ladles has received extensive attention from refractory researc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 张吉江刘加善刘卫新鲍忠诚周刚德冯兆胜
Owner JINAN IRON & STEEL GRP REFRACTORY CO LTD
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