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High-thermal-conductivity molten iron trough castable

A technology for molten iron ditch and castable, which is applied to blast furnaces, blast furnace details, blast furnace parts, etc., can solve the problem of not meeting the heat conduction requirements of the molten iron ditch, and achieves the improvement of the casting yard environment, thermal conductivity, and good oxidation resistance. Effect

Inactive Publication Date: 2020-08-25
REWELL REFRACTORY ZHENGZHOU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to ensure that the cooling device can take away the excess heat in the iron gutter in time, it is necessary to require the iron gutter castable to have good thermal conductivity, but currently the iron gutter castables used in blast furnaces are mainly made of Al 2 o 3 -SiC-C is the main component, and the thermal conductivity is lower than 3.0 w / (m·k). This type of castable cannot meet the heat conduction requirements of the iron gutter after the water cooling device is installed

Method used

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  • High-thermal-conductivity molten iron trough castable
  • High-thermal-conductivity molten iron trough castable
  • High-thermal-conductivity molten iron trough castable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1 Preparation of working lining castable for iron storage type molten iron ditch

[0043] Its raw material ratio is:

[0044] 45 parts of fused brown corundum with a particle size of 1~8mm;

[0045] 10 parts of fused dense corundum, including 7 parts of granular material with particle size of 0~1mm, and 3 parts of 325 mesh powder;

[0046] 8 parts of super bauxite with particle size of 3-8mm;

[0047] 30 parts of silicon carbide, including 18 parts of granular material with a particle size of 0~1mm, and 12 parts of 200 mesh powder;

[0048] 2 parts of pure calcium aluminate cement;

[0049] 3 copies of silicon micropowder with a particle size of 1 μm;

[0050] 8 parts of bimodal activated alumina micropowder with particle size of 3~5μm;

[0051] 4 parts of spherical pitch with a particle size of 0.2~0.5mm;

[0052] 1 part of nano carbon black powder;

[0053] 1 part of carbon resin powder;

[0054] 0.8 part of carbon dispersant;

[0055] 3 parts antioxi...

Embodiment 2

[0063] Example 2 Use effect comparison

[0064] figure 1 It is a newly built iron storage type hot metal ditch with a total width of 2900mm, and a large and medium-sized iron-making blast furnace (volume 1080m 3and above) are used together. Its working layer 1 adopts the castable prepared in Example 1, with a thickness of 900 mm; a carbon-containing refractory brick layer 3 (thermal conductivity 15w / (m·k)) is built between the steel shell 2 and the working layer 1, and the outer steel shell 2 A water-cooling plate 4 is installed, and temperature measuring thermocouples 5 are arranged in the working layer 1 adjacent to the carbon-containing refractory brick layer 3 .

[0065] figure 2 It is an iron storage type iron ditch transformed from an ordinary iron ditch, and the total width is the same as figure 1 In the same way, in order to save resources and reduce renovation costs, only the original refractories (Al 2 O 3 - SiC-C as the main component of the castable) excavat...

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Abstract

The invention discloses a high-thermal-conductivity molten iron trough castable, which is prepared from the following raw materials in parts by weight: fused brown fused alumina, fused compact corundum, special-grade bauxite, silicon carbide, pure calcium aluminate cement, silica powder, bimodal activated alumina powder, spherical asphalt, nano carbon black powder, carbon resin powder, a carbon dispersing agent, an antioxidant, organic fibers, an explosion-proof agent and a high-efficiency water reducing agent. Aiming at the problem of poor heat-conducting property of the traditional castable,the proportion of each basic raw material is scientifically adjusted, the nano carbon black powder, the carbon resin powder and the spherical asphalt are introduced for reasonable grading, and the carbon dispersing agent and the composite antioxidant are used as auxiliary materials, so that the heat conductivity of the molten iron trough castable is greatly improved; meanwhile, the finished high-thermal-conductivity molten iron trough castable has good oxidation resistance, high-temperature strength, volume stability and scouring resistance; the service life of the molten iron trough can be greatly prolonged in cooperation with a cooling device, and economic benefits and environmental protection benefits of blast furnace ironmaking are improved.

Description

technical field [0001] The invention relates to a castable for blast furnace iron gutter, in particular to a castable for a high thermal conductivity iron gutter. Background technique [0002] The iron-making blast furnace is one of the important equipment used in iron and steel smelting, and the blast furnace tapping ditch (hot metal ditch) is an important facility in front of the blast furnace. Its function is to separate liquid slag and iron and divert molten iron. The hot metal ditch not only has to withstand the high pressure impact of blast furnace tapping and high temperature above 1400℃, but also bear the thermal erosion from the complex chemical components in the slag, resulting in the short life of the refractory lining of the molten iron ditch, frequent maintenance, and labor intensity. Therefore, improving the life of the iron ditch and reducing the use cost of the iron ditch has always been the research and development direction in the industry. [0003] The st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/103C21B7/14C21B7/04
CPCC04B35/103C04B2235/3222C04B2235/3418C04B2235/402C04B2235/424C04B2235/445C04B2235/447C04B2235/5244C04B2235/77C04B2235/96C04B2235/9607C04B2235/9615C21B7/04C21B7/14
Inventor 丁丰收晁尚奎
Owner REWELL REFRACTORY ZHENGZHOU CO LTD
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