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Castable for main trough of middle-sized blast furnace

A castable and main iron trench technology, applied in the field of metallurgical refractories, can solve the problems of stable and safe production of blast furnaces, thermal spalling structure, poor thermal shock resistance, etc., to enhance high temperature strength and various properties, increase lubrication Wet angle, good construction performance

Inactive Publication Date: 2016-01-20
张婷
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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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  • Castable for main trough of middle-sized blast furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Use formula 1 to prepare the main iron channel of blast furnace: mix the ingredients according to formula 1 and stir in the mixer, then add 3-8% of the above-mentioned total amount of clean water, stir evenly, and pour it into the mold installed in the main iron channel where the molten iron flows. Add castables, and natural curing for 1 hour to demould the blast furnace main iron trough.

Embodiment 2

[0022] Prepare the main iron channel of blast furnace with formula 2: mix the ingredients according to formula 2 and stir in the mixer, then add 3-8% of the above-mentioned total amount of clean water, stir evenly, and pour it into the mold installed in the main iron channel where the molten iron flows. Add castables, and natural curing for 1 hour to demould the blast furnace main iron trough.

Embodiment 3

[0024] Prepare the main iron channel of blast furnace with formula 3: mix the ingredients according to formula 3 and stir in the mixer, then add 3-8% of the above-mentioned total amount of clean water, stir evenly, and pour it into the mold installed in the main iron channel where the molten iron flows. Add castables, and natural curing for 1 hour to demould the blast furnace main iron trough.

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Abstract

The invention relates to a castable for a main trough of a middle-sized blast furnace and belongs to the field of refractory castables. The castable is prepared from the following components in parts by weight: 5 to 8 parts of 8-5mm tabular corundum, 15 to 20 parts of 5-3mm chromium nitride, 10 to 15 parts of 3-1mm sillimanite, 8 to 15 parts of 1-0mm calcium chromate, 2 to 5 parts of slightly viscous clay powder, 3 to 7 parts of cobaltous oxide aluminum powder, 5 to 10 parts of cutting powder, 3 to 8 parts of amorphous graphite powder, 1 to 2 parts of composite carbon powder, 0 to 3 parts of molybdenum trioxide powder, 3 to 5 parts of alumina micro powder, 1 to 5 parts of magnesium oxide iron powder, 1 to 3 parts of rho aluminium oxide and 0 to 5 parts of electric smelting pure calcium aluminate cement; it is assumed that the sum of the total weight parts of main ingredients is 100%, then additives comprise the following components in part by weight: 0.1 to 0.2 part of calcium lignosulphonate, 0.01 to 0.05 part of nanometer potato powder, 0.01 part of malic acid and 0.1 part of C12H14N4O5S2. The main trough of the blast furnace prepared with the castable has the advantages of good thermal shock resistance, strong erosion resistance, a big iron influx and a long service life.

Description

technical field [0001] The invention relates to a castable material for a medium-sized blast furnace main iron trough, which belongs to the field of refractory materials for metallurgy. Background technique [0002] Most of the existing main iron trough castables are Al2O3-SiC-C castables, but ordinary Al2O3-SiC-C main iron trough castables are used in blast furnaces, and the one-time iron flow is about 120,000 tons. With the strengthening of smelting, the demand for increasing the output of molten iron is becoming 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, at present, the main iron channel has thermal spalling due to poor corrosion resistance and poor thermal shock resistance. And structural spalling is an important reason for the short life of the main iron trough. [0003] CN102101782A discloses a castable for main iron trough. The castable is composed...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66
Inventor 张婷
Owner 张婷
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