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Preparation method of energy-saving composite refractory material

A technology of refractory materials and binders, applied in the field of refractory materials, can solve the problems of poor corrosion resistance and thermal shock resistance, weak slagging resistance of refractory materials, poor thermal shock resistance stability, etc., and achieve stable corrosion resistance and chemical properties , good energy saving and environmental protection benefits, good temperature resistance

Inactive Publication Date: 2017-09-22
HEFEI MINGYOU HIGH TEMPERATURE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when mullite is used as a refractory material, there are still the following deficiencies: 1) Mullite is a high-alumina mineral, and its main component is 3Al 2 o 3 2SiO2 2 , as a refractory material, it is easily corroded when used in equipment with an alkaline atmosphere such as a steelmaking furnace
2) Mullite has poor resistance to iron slag and alkaline sludge when used in steelmaking furnaces and other equipment
3) The thermal shock resistance of mullite refractory products is poor
[0003] Chinese patent CN2007103045733, the patent name is high-strength low thermal conductivity energy-saving material, the application date is March 31, 2016, which discloses a kind of microporous mullite as aggregate, adding activated alumina micropowder, silica micropowder, high temperature cement and alum The refractory products made of soil fine powder have the advantages of small thermal conductivity and less heat loss, but the content of alumina in the refractory material reaches 52%-81%, which makes the refractory material weak in slagging resistance, erosion resistance and corrosion resistance. Poor thermal shock resistance, so poor applicability to steelmaking furnaces, metallurgical kilns and other equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A method for preparing an energy-saving composite refractory material, comprising the following preparation steps:

[0029] a. Mix magnesium oxide and calcium oxide to remove impurities with clean water and magnetic separation to remove iron, then dry at 120°C, and use a pulverizer to pulverize until passing through a 300-mesh sieve to obtain a mixture 1;

[0030] b. Mix serpentine fine powder, silicon carbide and waste tailings slag evenly, and use a ball mill to mill for 3 hours to obtain mixture 2;

[0031] c. Add binder to mixture 2, stir and mix at 90°C for 20 minutes, then add plasticizer and stir and mix for 30 minutes to obtain mixture 3;

[0032] d. After the mixture 3 is calcined and dried, the finished product can be obtained.

[0033] The energy-saving composite refractory material includes the following raw materials in parts by weight: 26 parts of magnesium oxide, 28 parts of calcium oxide, 12 parts of serpentine fine powder, 20 parts of silicon carbide, ...

Embodiment 2

[0042] A method for preparing an energy-saving composite refractory material, comprising the following preparation steps:

[0043] a. Mix magnesium oxide and calcium oxide to remove impurities with clean water and magnetic separation to remove iron, then dry at 80°C, and use a pulverizer to pulverize until passing through a 300-mesh sieve to obtain a mixture 1;

[0044] b. Mix serpentine fine powder, silicon carbide and waste tailings slag evenly, and use a ball mill to mill for 2 hours to obtain mixture 2;

[0045] c. Add binder to mixture 2, stir and mix at 80°C for 20 minutes, then add plasticizer and stir and mix for 30 minutes to obtain mixture 3;

[0046] d. After the mixture 3 is calcined and dried, the finished product can be obtained.

[0047] The energy-saving composite refractory material includes the following raw materials in parts by weight: 23 parts of magnesium oxide, 25 parts of calcium oxide, 12 parts of serpentine fine powder, 20 parts of silicon carbide, 1...

Embodiment 3

[0056] A method for preparing an energy-saving composite refractory material, comprising the following preparation steps:

[0057] a. Mix magnesium oxide and calcium oxide to remove impurities with clean water and magnetic separation to remove iron, then dry at 120° C., and use a pulverizer to pulverize until passing through a 300-mesh sieve to obtain a mixture 1;

[0058] b. Mix serpentine fine powder, silicon carbide and waste tailings slag evenly, and use a ball mill to mill for 3 hours to obtain mixture 2;

[0059] c. Add binder to mixture 2, stir and mix at 90°C for 20 minutes, then add plasticizer and stir and mix for 40 minutes to obtain mixture 3;

[0060] d. After the mixture 3 is calcined and dried, the finished product can be obtained.

[0061] The energy-saving composite refractory material includes the following raw materials in parts by weight: 23 parts of magnesium oxide, 28 parts of calcium oxide, 17 parts of serpentine fine powder, 22 parts of silicon carbide...

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Abstract

Provided is a preparation method of an energy-saving composite refractory material. The method includes the steps that a, magnesium oxide and calcium oxide are mingled, clear water is used for removing impurities in magnesium oxide and calcium oxide, and magnetic separation for removing iron is performed, then a pulverizer is adopted for smashing to obtain a first mixture after drying; b, fine serpentine powder, silicon carbide and waste tail slags are blended and disposed by a ball mill in a ball-milling mode to obtain a second mixture; c, the second mixture is added with a bonding agent, and stirred and mixed with a plasticizer after being stirred evenly to obtain a third mixture; d, the third mixture is disposed by calcination and drying to complete the whole process. Refractory materials prepared by the preparation method have the advantage of great thermal shock resistance, and meanwhile, since the silicon carbide generates a silicon dioxide layer film under a high temperature in a refractory material layer, the slags are prevented from soaking into the refractory material layer, and the corrosion caused on the refractory material layer by the slags is restrained.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a preparation method of an energy-saving composite refractory material. Background technique [0002] Mullite is an aluminosilicate mineral formed at high temperature. As a high-quality refractory material, it has the advantages of high strength, high melting point, and low thermal conductivity. It is now widely used in various industries such as steel, nonferrous metals, and chemicals. In kilns, thermal equipment and structures in the field. However, when mullite is used as a refractory material, there are still the following deficiencies: 1) Mullite is a high-alumina mineral, and its main component is 3Al 2 o 3 2SiO2 2 , as a refractory material, it is easily corroded when used in equipment with an alkaline atmosphere such as a steelmaking furnace. 2) When mullite is used in steelmaking furnaces and other equipment, the effect of resisting iron slag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/057
CPCC04B35/66C04B35/057C04B2235/3206C04B2235/3481C04B2235/349C04B2235/3826
Inventor 王虎
Owner HEFEI MINGYOU HIGH TEMPERATURE TECH CO LTD
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