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Magnesian furnace protection burden for converter

A furnace protection material and magnesia technology, which is applied in the field of magnesia protection materials for converters, can solve the problems of dumping dust and ash to pollute the environment, achieve high strength and realize the effect of recycling

Active Publication Date: 2014-11-05
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Patent CN101413043 provides a kind of steelmaking adjustment agent and its preparation method using dedusting ash as the main raw material to solve the problem of environmental pollution caused by dumping dedusting ash in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Material selection

[0034] Choose the first magnesite, the second magnesite, magnesite and anthracite, among which:

[0035] The content of the chemical components in the first magnesia is calculated by weight percentage: MgO is 88% by weight, CaO is 3% by weight, and SiO 2 3% by weight, Al 2 O 3 Is 2% by weight;

[0036] The content of the chemical components in the second magnesia is calculated by weight percentage: MgO is 68% by weight, CaO is 5% by weight, and SiO 2 3% by weight, Al 2 O 3 22% by weight, V 2 O 3 Is 2% by weight;

[0037] The chemical composition in the magnesite is calculated as weight percentage: MgCO 3 Is 93% by weight;

[0038] The chemical components in the anthracite coal are calculated by weight percentage: C content is 95% by weight.

[0039] (2) Material preparation

[0040] The particle gradation ratio of the first magnesia is 3-1mm: 1-0.074mm: <0.074mm=1:5:4 for material preparation; the second magnesia particle gradation ratio is 3-1mm: 1-0.074mm...

Embodiment 2

[0049] (1) Material selection

[0050] The same first magnesia, second magnesia, magnesite and anthracite as in Example 1 were selected.

[0051] (2) Material preparation

[0052] The particle gradation ratio of the first magnesia is 3-1mm: 1-0.074mm: <0.074mm=1:5:4 for material preparation; the second magnesia particle gradation ratio is 3-1mm: 1-0.074mm: <0.074mm=1:5:4 for material preparation; the magnesite and the anthracite are respectively pulverized in a ball mill to a particle size of 0.074~0.10mm, 0.12~0.15mm, wherein the carbonization In the composition of silicon and silicon, the weight ratio of silicon carbide to silicon is 1:1.

[0053] The first magnesia, the second magnesia, the magnesite, the anthracite, and the composition of silicon carbide and silicon are mixed in a weight ratio of 41:41:5:14:4. Mixture B1.

[0054] (3) Mixing

[0055] Mixing the mixture B1 in step (2) in the presence of a binding agent for 20 minutes, wherein the amount of the binding agent is 2% by...

Embodiment 3

[0061] (1) Material selection

[0062] The same first magnesia, second magnesia, magnesite and anthracite as in Example 1 were selected.

[0063] (2) Material preparation

[0064] The particle gradation ratio of the first magnesia is 3-1mm: 1-0.074mm: <0.074mm=1:5:4 for material preparation; the second magnesia particle gradation ratio is 3-1mm: 1-0.074mm: <0.074mm=1:5:4 for material preparation; the magnesite and the anthracite are respectively pulverized in a ball mill to a particle size of 0.074~0.10mm, 0.12~0.15mm, wherein the carbonization In the composition of silicon and silicon, the weight ratio of silicon carbide to silicon is 1:1.

[0065] The first magnesia, the second magnesia, the magnesite, the anthracite, and the composition of silicon carbide and silicon are mixed in a weight ratio of 39:39:4:13:3. Mixture C1.

[0066] (3) Mixing

[0067] Mixing the mixture C1 in step (2) in the presence of a binder for 18 minutes, wherein the amount of the binder is 1.5% by weight to o...

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Abstract

The invention discloses a magnesian furnace protection burden for a converter. The magnesian furnace protection burden contains magnesium oxide, carbon and a composition of silicon carbide and silicon. Weight ratio of the composition of silicon carbide and silicon to magnesium oxide to carbon is 1:10-15:2-4. With the total weight of the magnesian furnace protection burden as the standard, the content of the composition of silicon carbide and silicon is 1-4.5 wt%. Strength of the magnesian furnace protection burden for the converter is high. The magnesian furnace protection burden can directly enter an overhead bunker. For example, slag splashing requirements can be met if the magnesian furnace protection burden which accounts for 3-5 wt% of the slag amount before slag splashing is added into each converter. Thus, recycling of furnace lining magnesia is realized.

Description

Technical field [0001] The invention belongs to the field of converter steelmaking, and specifically relates to a magnesium protective furnace charge for a converter. Background technique [0002] In the 1950s, oxygen top-blown converter steelmaking (also known as LD method and BOF method) gradually replaced the air converter method and the flat furnace steelmaking method, becoming the main method of modern steelmaking. In the 1970s, the top and bottom combined blowing technology improved the efficiency of converter smelting and the quality of molten steel, reducing production costs. In the 1980s, MgO-C bricks were successfully applied to steel-making converters. Due to their excellent slag resistance and thermal shock resistance, the age of the converters was significantly improved. In the 1990s, the American LTV company adopted slag splashing furnace protection technology, which greatly increased the service life of MgO-C bricks, and the converter age reached more than 20,000 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/36C04B35/66
CPCY02P10/20
Inventor 李龙陈永冉茂华戈文荪张柳方王建陈炼李扬洲杨森祥杨金成黄德胜李平凡杨大刚杜利华
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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