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Magnesium-calcium-carbon refractory material

A refractory material, magnesia-calcium-carbon technology, applied in the field of metallurgical refractory materials, can solve problems such as difficult to be applied, high activity, flammable and explosive, and difficult to become an antioxidant for magnesia-carbon bricks

Active Publication Date: 2013-02-06
江苏苏嘉集团新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high activity, flammability and explosiveness of metal magnesium also make it difficult to be an antioxidant for magnesia carbon bricks
Calcium metal is more active and more difficult to be applied

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The ratio of magnesia-calcium-carbon refractory materials is as follows in parts by weight: 10 parts of -198 graphite, 15 parts of needle coke, 64 parts of dolomite sand, 6 parts of magnesium-zirconium alloy powder, 4.5 parts of phenolic resin solution with water content <0.5%, black Lotropine 0.5 part. Among them, the zirconium content in the magnesium-zirconium alloy powder is 10%, and the particle size is less than 0.25mm.

[0032] The preparation method of the magnesium-calcium carbonaceous refractory material, the steps are as follows:

[0033] (1) Preparation of pre-mixed fine powder: Add dolomite sand fine powder and magnesium-zirconium alloy powder with a particle size of ≤0.2mm into the mixer and mix for 20 minutes to obtain pre-mixed fine powder;

[0034] (2) Preparation of mud: Add dolomite sand particles and urotropine into the mixer and mix, then add phenolic resin solution and mix for 5 minutes, add needle coke and graphite and continue mixing for 15 minu...

Embodiment 2

[0039]The ratio of magnesia-calcium-carbon refractories is as follows in parts by weight: 2 parts of -194 graphite, 1 part of N220 carbon black, 80 parts of dolomite sand, 12 parts of magnesia, 3 parts of magnesium-zirconium alloy powder, 2 parts of coal tar, of which magnesium The zirconium content in the zirconium alloy powder is 3%, and the particle size is less than 0.25mm.

[0040] The preparation method of the magnesium-calcium carbonaceous refractory material, the steps are as follows:

[0041] (1) Preparation of pre-mixed fine powder: put magnesia fine powder with a particle size of less than 0.074mm and magnesium-zirconium alloy into a pre-mixer and mix for 10 minutes to obtain a pre-mixed fine powder; heat and dehydrate the coal tar until the water content is <0.3 %, and keep it warm to keep it liquid.

[0042] (2) Preparation of mud: heat the dolomite sand particles and add them to the mixer for mixing, then add hot tar and mix for 2 minutes, add -194 graphite and ...

Embodiment 3

[0047] The ratio of magnesia-calcium-carbon refractories is as follows in parts by weight: 1 part of N220 carbon black, 50 parts of dolomite sand, 46 parts of magnesia-calcium sand, 0.2 parts of magnesium-zirconium alloy powder, 2.8 parts of medium-temperature pitch, of which zirconium in magnesium-zirconium alloy The proportion is 35%, and the particle size is ≤10 microns.

[0048] (1) Preparation of pre-mixed fine powder: Add magnesia-calcium sand, fine powder of dolomite sand with particle size ≤0.1mm and magnesium-zirconium alloy powder into the pre-mixer, and pre-mix evenly to obtain pre-mixed fine powder;

[0049] (2) Preparation of mud material: heat and liquefy the medium-temperature asphalt to 160°C, keep it warm until no water vapor emerges, and the moisture content is <0.2%; heat the dolomite sand and magnesia-calcium sand particles with a particle size of 6-0.1mm to 200°C Send it into the mixer for mixing, mix it for 1 minute, pour it into the asphalt melt and mix ...

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Abstract

The invention relates to a magnesium-calcium-carbon refractor material, in particular to a refractory material for smelting, which belongs to the technical field of refractory materials for smelting. The magnesium-calcium-carbon refractor material contains 1-25 parts of carbon, 0.2-6 parts of a magnesium-zirconium alloy, 60-96 parts of a mixture of dolomite sand, magnesium-calcium sand and magnesium sand, and 2-5 parts of a carbon-containing bonding agent, wherein the magnesium-zirconium alloy contains 3-35 percent of a zirconium element and the balance of magnesium and a small quantity of impurities. The magnesium-calcium-carbon refractor material provided by the invention can be taken as a refractory material for smelting, and has the advantages of oxidation resistance, high temperature resistance, slag permeation resistance, thermal shock resistance and easiness in producing.

Description

technical field [0001] The invention relates to a magnesium-calcium carbonaceous refractory material, in particular to a metallurgical refractory material, belonging to the technical field of metallurgical refractory materials. Background technique [0002] Magnesium-calcium refractory is a kind of basic refractory material, which has been used as the lining material of steelmaking converter since the early 1960s, and has contributed to the development of my country's converter steelmaking industry. By the end of the 1980s, due to the promotion and application of magnesia-carbon bricks, the amount of magnesia-calcium refractory materials decreased sharply, and they were almost eliminated, and only a few manufacturers used them. Since the beginning of this century, with the rapid development of stainless steel and clean steel production in China, various magnesia-calcium refractory materials have been re-emphasized due to their unique performance, low price and advantages in ...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 张雪松俞晓东
Owner 江苏苏嘉集团新材料有限公司
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