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Non-carbon residue feather edge brick for refining steel ladle and preparation method thereof

A technology of carbon slag wire brick and refined steel, which is applied in the field of refractory materials, can solve the problem of carbon increase, restrict the smelting process of ultra-low carbon steel, and the problems of unsynchronized service life of refractory lining and low service life, so as to improve anti-stripping Sex and thermal shock stability, improved thermal shock stability, and improved compressive strength

Active Publication Date: 2010-10-20
SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, when smelting low-carbon steel and ultra-low carbon steel and other varieties of steel, aluminum-magnesium spinel bricks are generally used as the working lining material for the bottom and wall of the ladle, replacing traditional aluminum-magnesia-carbon bricks and magnesia-carbon bricks, and controlling the ladle. Refining-carburization of molten steel by refractory materials during transportation; and the slag line of this type of refining ladle is generally built and fired into magnesia-chrome bricks and magnesia-alumina bricks, etc., due to the erosion of high-temperature alkaline slag and repeated high-low temperature Shock, its service life is very low, far from being synchronized with the service life of the refractory lining in other parts of the ladle
Most steel mills use magnesia-carbon bricks (14-18% carbon content) or low-carbon magnesia-carbon bricks (about 5% carbon content) as the working lining of the slag line, but the carburization of molten steel during the smelting process is still a constraint. Bottleneck of low carbon steel smelting process

Method used

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  • Non-carbon residue feather edge brick for refining steel ladle and preparation method thereof
  • Non-carbon residue feather edge brick for refining steel ladle and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put high-alumina corundum particles, fused spinel particles, and fused magnesia particles into the wheel mill and mix for 3 minutes, then add aluminum dihydrogen phosphate solution and mix for 5 minutes; then add high-alumina corundum fine powder, fused magnesia Sand fine powder, chromium trioxide fine powder, high-temperature alumina fine powder and other fine powders were mixed for 10 minutes; then dextrin solution was added and mixed for 3 minutes; after mixing evenly, the materials were discharged, and the materials were mixed for 24 hours at 20°C; bricks were pressed by friction Machine molding, the molding pressure is 150MPa. After baking at 180°C for 24 hours, a carbon-slag-free line brick was obtained. Its apparent porosity is 10±2%, its bulk density is 3.10±0.02g / cm3, its compressive strength is 60±10MPa, and its permanent line change after burning at 1550°C is ±1%. Raw materials used and proportioning (proportioning is mass percent) are as follows:

[0029] ...

Embodiment 2

[0034] Put white corundum particles, fused spinel particles, and fused magnesia particles into the wheel mill and mix for 3 minutes, then add water glass solution and mix for 5 minutes; then add white corundum fine powder, fused magnesia fine powder, three Fine powders such as chromium oxide fine powder and high-temperature alumina fine powder were mixed for 8 minutes; then sodium carboxymethyl cellulose solution was added and mixed for 5 minutes; after mixing evenly, the material was discharged, and the material was dried at 20°C for 18 hours; the molding pressure was 180MPa. After baking at 180°C for 24 hours, the carbon slag-free wire brick can be obtained. The apparent porosity is 8.5±1.5%, the bulk density is 3.12±0.02g / cm3, the compressive strength is 70±10MPa, and the permanent line change after burning at 1550℃ is ±1%. Raw material weight ratio is as follows:

[0035] raw material name

Specification

purity

% by weight / %

White corundum parti...

Embodiment 3

[0041] Put white corundum particles, tabular corundum particles, fused spinel particles, and fused magnesia particles into the wheel mill and mix for 2 minutes, then add sodium tripolyphosphate solution and mix for 8 minutes; then add platy corundum fine powder , fused magnesia fine powder, chromium trioxide fine powder, high-temperature alumina fine powder and other fine powders were mixed for 10 minutes; then polyvinyl alcohol solution was added and mixed for 5 minutes; after mixing evenly, the material was discharged, and the material was mixed for 18 hours at 20°C ; Molding pressure is 200MPa. After baking at 180°C for 24 hours, the carbon slag-free wire brick can be obtained. The apparent porosity is 11±2%, the bulk density is 3.08±0.02g / cm3, the compressive strength is 55±10MPa, and the permanent line change after burning at 1550°C is ±1%. Raw material weight ratio is as follows:

[0042] raw material name

[0043] raw material name

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Abstract

The invention relates to a refractory and mainly provides a non-carbon residue feather edge brick for a refining steel ladle and a preparation method thereof. The non-carbon residue feather edge brick is formed by taking corundum grains, electrofused spinel grains and electrofused magnesia grains as aggregate, taking corundum fine powder, high-temperature alumina micropowder, electrofused magnesia, chromium sesquioxide, aluminum metal powder and other powders as base components and adopting a mode of compounding and adding inorganic and organic bonding agents and a mode of machine pressing. The obtained non-carbon residue feather edge brick has the advantages of high strength of generated blanks, no firing, favorable thermal shock stability, strong capability of resisting acid and alkali molten slag, no pollution on molten steel and the like and can be applied to residue line parts of the steel ladle under the conditions of RH and specified LF / VD refining.

Description

technical field [0001] The invention relates to a refractory material, and mainly provides a carbon-free slag line brick for refining ladles and a preparation method thereof. The carbon-free slag line brick is suitable for the slag line part of a steel ladle under RH and specific LF / VD refining conditions. Background technique [0002] With the rapid development of RH operation technology represented by Baosteel and Wuhan Iron and Steel in my country, a batch of special steels such as automobile panel steel, high-quality pipeline steel and non-magnetic steel have been developed. The carbon content of refractory materials puts forward strict control requirements. At present, when smelting low-carbon steel and ultra-low carbon steel and other varieties of steel, aluminum-magnesium spinel bricks are generally used as the working lining material for the bottom and wall of the ladle, replacing traditional aluminum-magnesia-carbon bricks and magnesia-carbon bricks, and controlling ...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 柳军韦祎冯海霞
Owner SINOSTEEL LUOYANG INST OF REFRACTORIES RES
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