Small blast furnace main iron runner castable

A castable and main iron trench technology, applied in the field of metallurgical refractory materials, can solve the problems of stable and safe production of blast furnaces, poor thermal shock resistance, thermal spalling structure, etc., to reduce the amount of additives, high thermal shock resistance, Effect of improving thermal shock resistance

Inactive Publication Date: 2014-05-21
占丽青
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of castable with brown corundum as the main component has poor thermal shock resistance, which is easy to cause thermal spalling and structural spalling, which greatly increases the frequency of repairing the main iron trench and brings great hidden dangers to the stable and safe production of blast furnaces. Improve

Method used

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  • Small blast furnace main iron runner castable

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Use formula 1 to prepare blast furnace main iron trough: mix the ingredients according to formula 1 and stir them with a mixer to form castables, add castables to the mold installed in the main iron trough where molten iron flows, and naturally cure for 1 hour to demould to obtain blast furnace main iron ditch.

Embodiment 2

[0020] Use formula 2 to prepare the main iron trough of small blast furnace: mix the ingredients according to formula 1 and stir it with a mixer to make castables, add castables to the mold installed in the main iron trough where molten iron flows, and let it be naturally cured for 1 hour to demould to get the blast furnace main iron ditch.

Embodiment 3

[0022] Use Formula 3 to prepare the main iron trough of the small blast furnace: mix the ingredients according to Formula 1 and stir it with a mixer to make the castable, then add the castable to the mold installed in the main iron trough where the molten iron flows, and let it be naturally cured for 1 hour to demould to obtain the blast furnace main iron ditch. Specific indicators see the table below

[0023]

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Abstract

The invention relates to a small blast furnace main iron runner castable, belonging to the field of refractory castables. The small blast furnace main iron runner castable comprises the following components in parts by weight: 48-56 parts of alumina, 1-8 parts of zirconium mullite hollow sphere, 3-10 parts of metallic silicon powder, 10-25 parts of gahnite powder, 10-15 parts of waste smelting furnace casing, 3-10 parts of strontium titanate powder, 1-2 parts of Gangxi sludge, 1-5 parts of silicon nitride, and additionally 0.1-0.2 part of sodium tripolyphosphate, 0.05-0.2 part of styrene maleic anhydride and 3-8 parts of aluminum sol suspension. The waste smelting furnace casing is a graphite production furnace casing which is mainly composed of 56-68% of SiC, 10-20% of C and 3-10% of SiO2. The blast furnace iron runner prepared from the castable has the characteristics of favorable thermal shock resistance, high corrosion peeling resistance, high iron flux and long service life.

Description

technical field [0001] The invention relates to a castable material for the main iron trough of a small blast furnace, which belongs to the field of metallurgical refractory materials. Background technique [0002] Most of the existing main iron trough castables are Al 2 o 3 -SiC-C castables, but ordinary Al 2 o 3 -SiC-C main iron trough castables are used in blast furnaces, and the amount of one-time passing iron is about 100,000 tons. With the strengthening of smelting, the demand for increasing the output of molten iron has become increasingly prominent, and the demand for a large amount of iron passing through the main iron channel at one time is also becoming more and more urgent. However, due to the poor thermal shock resistance of the main iron channel, thermal spalling and structural spalling occur, resulting Not anti-corrosion is an important reason for the short life of the main iron channel. [0003] CN102101782A discloses a castable for main iron trough, sai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 山国强
Owner 占丽青
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