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Environment-friendly magnesia carbon gunning mix for RH furnace and preparation method thereof

A technology of gunning material and magnesia-carbon, which is applied in the field of environment-friendly magnesia-carbon gunning material for RH furnace dipping pipe and its preparation, can solve the problems of poor corrosion resistance, affecting production efficiency, and weak adhesion rate, etc., and achieve anti-corrosion Improved scouring performance and bond strength, low production cost, and improved slag resistance

Inactive Publication Date: 2019-12-13
瑞泰马钢新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In domestic technology, hot gunning material is used to spray impregnated pipes, generally using magnesium, magnesium calcium or magnesium chromium. The main raw material is high-grade magnesia, the cost performance is relatively low, and magnesium gunning material exists Problems such as easy peeling off after high temperature overburning, poor corrosion resistance, weak adhesion rate, etc.
At present, in the existing technology of gunning material for RH furnace dipping pipe in Maanshan Steel No. 4 Steel Plant, the service life of gunning material is basically once, and the service life is short, which affects production efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of magnesium carbon gunning material, the total amount is 500kg, and its composition is by weight percentage:

[0028] 94 Fused magnesia particles 3-1mm are 15%, 1-0mm is 25%, magnesia carbon material particles 3-1mm is 8%, 1-0mm is 10%, 100 mesh (less than 150μm) is 6%, 94 Fused magnesia fine powder 180 mesh (less than 80 μm) is 12%, fused white corundum fine powder 240 mesh (less than 61 μm) is 10%, Guangxi white clay is 2%, bentonite is 2%, aluminum-magnesium binder ( The aluminum-magnesium binder is high-grade alumina and magnesia, the mass ratio is 4:1, the particle size is 240 mesh) is 8%, sodium carboxymethylcellulose CMC is 0.1%, sodium polyacrylate is 0.4%, hexadecimal Sodium phosphate is 0.8%, sodium fluorosilicate is 0.5%, and organic anti-explosion fiber is 0.2%.

[0029] According to the preparation method of the magnesia-carbon gunning material for RH furnace of the present invention described below, the finished magnesia-carbon gunning material is...

Embodiment 2

[0033] A magnesium-carbon gunning material without aluminum-magnesium binder, the total amount is 500kg, and its composition is by weight percentage:

[0034] 94 fused magnesia particles are 16.3% for 3-1mm, 27.2% for 1-0mm, 8.7% for 3-1mm particles of fired magnesium carbon material, 10.9% for 1-0mm, 6.5% for 100 mesh, 94 fused magnesia Sand fine powder 180 mesh is 13%, fused white corundum fine powder 240 mesh m is 10.9%, Guangxi white clay is 2.2%, bentonite is 2.2%, carboxymethyl cellulose sodium CMC is 0.1%, and sodium polyacrylate is 0.4% %, sodium hexametaphosphate is 0.9%, sodium fluorosilicate is 0.5%, and organic explosion-proof fiber is 0.2%.

[0035] According to the preparation method of the magnesia-carbon gunning material for RH furnace of the present invention described below, the finished magnesia-carbon gunning material is obtained.

[0036] The physical and chemical indicators of the finished magnesium carbon gunning material of this scheme: under the condi...

Embodiment 3

[0039] A kind of magnesium carbon gunning material, the total amount is 500kg, and its composition is by weight percentage:

[0040]94 fused magnesia particles 3-1mm is 10%, 1-0mm is 20%, after burning magnesium carbon material particles 3-1mm is 12%, 1-0mm is 14%, 100 mesh is 12%, 94 fused magnesium Sand fine powder 180 mesh is 13%, fused white corundum fine powder 240 mesh is 6%, Guangxi white mud is 3%, bentonite is 1.5%, aluminum-magnesium binder is 6% (aluminum-magnesium binder is high-grade oxidation Aluminum and magnesium oxide, the mass ratio is 1:1, the particle size is 240 mesh), carboxymethylcellulose sodium CMC is 0.5%, sodium polyacrylate is 0.2%, sodium hexametaphosphate is 0.6%, sodium fluorosilicate is 1.1% %, organic explosion-proof fiber is 0.1%.

[0041] According to the preparation method of the magnesia-carbon gunning material for RH furnace of the present invention described below, the finished magnesia-carbon gunning material is obtained.

[0042] The ...

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Abstract

The invention relates to the technical field of amorphous refractory materials and specifically to an environment-friendly magnesia carbon gunning material for an RH furnace and a preparation method thereof. According to the gunning mix, a post-sintering regenerated magnesia carbon material and magnesia are used as main raw materials; high-grade aluminum oxide and magnesium oxide are added as basic raw materials; and a self-made aluminum-magnesium binding agent fully calcined at a high temperature and the like are utilized to prepare the environment-friendly magnesia carbon gunning mix for theRH furnace. After trial of the obtained gunning material, the gunning service life of the RH furnace is prolonged to 2-4 times from the original 1-2 times, and anti-scouring resistance and bonding strength are obviously improved. The magnesium carbon gunning material produced by adopting a scheme in the invention has the advantages that the capital is saved by 800 yuan per ton compared with original magnesium gunning materials, greater economic benefits can be brought to enterprises every year, and the purposes of reducing cost, increasing efficiency and recycling wastes are achieved.

Description

technical field [0001] The invention relates to the technical field of monolithic refractory materials, in particular to an environment-friendly magnesia-carbon gunning material for RH furnace dipping pipes and a preparation method thereof. Background technique [0002] As an important process for clean steel production, RH vacuum refining has the advantages of large production capacity, good refining, and short processing cycle. The use environment of the RH vacuum degassing furnace is usually more harsh than the working conditions of ladles and converters, mainly because of RH vacuum degassing The furnace works under high temperature and vacuum conditions, and is subjected to high-speed air flow and molten steel erosion, chemical erosion of molten metal, and frequent temperature fluctuations, resulting in materials subject to mechanical wear, thermal shock, and chemical erosion. As an important part of the whole RH device, the dipping tube has a harsher working environment...

Claims

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Application Information

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IPC IPC(8): C04B35/043C04B35/626C04B35/63
CPCC04B35/043C04B35/62204C04B35/62605C04B35/6303C04B2235/3206C04B2235/3217C04B2235/349C04B2235/5212C04B2235/96C04B2235/9615C04B2235/9669
Inventor 卢咏明陈海山张小红骆文凯郁书中彭学峰赵杰夫程峰
Owner 瑞泰马钢新材料科技有限公司
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