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Low-thermal-conductivity refractory material, low-thermal-conductivity refractory brick, preparation method of refractory brick and application

A refractory material and low thermal conductivity technology, applied in the field of refractory materials, can solve the problems of heat loss, energy waste, large thermal conductivity of magnesia-chrome bricks, and high temperature

Inactive Publication Date: 2021-09-28
MARVELS REFRACTORIES ANSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these products have a higher thermal conductivity than magnesia-chrome bricks, resulting in a higher temperature of the outer cylinder of the rotary kiln than the inner lining of magnesia-chrome bricks.
The firing zone is still protected by the kiln skin, and the cylinder temperature is relatively low, while the transition zone has no stable kiln skin protection. The cylinder temperature is too high during the operation of the rotary kiln, which is easy to deform the cylinder and cause safety hazards; at the same time, heat loss Excessive waste of energy

Method used

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  • Low-thermal-conductivity refractory material, low-thermal-conductivity refractory brick, preparation method of refractory brick and application
  • Low-thermal-conductivity refractory material, low-thermal-conductivity refractory brick, preparation method of refractory brick and application
  • Low-thermal-conductivity refractory material, low-thermal-conductivity refractory brick, preparation method of refractory brick and application

Examples

Experimental program
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Effect test

preparation example Construction

[0028]In the present invention, the raw materials for the preparation of the low thermal conductivity refractory material include light spinel particles. In the present invention, the preparation method of the light spinel particles preferably includes the following steps:

[0029] Grinding and mixing alumina, magnesite, pore-forming agent, binder and water to obtain mixed mud;

[0030] The mixed mud is dehydrated and sintered in sequence to obtain light spinel particles.

[0031] The invention grinds and mixes alumina, magnesite, pore-forming agent, binder and water to obtain mixed mud. In the present invention, the alumina is preferably gamma-industrial alumina, the pore-forming agent is preferably PMMA microspheres (Beijing Senchang Taihe Co.), plant powder or activated carbon, and the binding agent is preferably lignin sulfonate salt or carboxymethylcellulose. In the present invention, the mass ratio of alumina, magnesite, pore-forming agent, binder and water is prefera...

Embodiment 1

[0051] The preparation of lightweight spinel particles comprises the following steps:

[0052] In terms of parts by mass, 55 parts of alumina (specifically γ-industrial alumina), 45 parts of magnesite, 1 part of pore-forming agent (specifically PMMA material microspheres, purchased from Beijing Senchang Taihe Company), 0.5 Part binding agent (being specifically carboxymethyl cellulose) is ground and mixed with 130 parts of water, obtains mixed sludge;

[0053] The mixed mud is pumped into a filter press for dehydration, and then the mud is refined by a vacuum mud mill, extruded and cut to form a mud section, and then dried, sintered and crushed in sequence to obtain light spinel particles; , the pressure of the dehydration is 2.3MPa; the vacuum degree of the vacuum mud mill is 0.085MPa; the mud section formed after extrusion cutting is cylindrical with a diameter of 20mm and a length of 50mm; the drying temperature is 270°C, The time is 2 hours, the residual moisture content ...

Embodiment 2～4

[0063] The low thermal conductivity refractory bricks were prepared according to the method of Example 1. The raw materials and addition amounts of the low thermal conductivity refractory materials in each embodiment are shown in Table 1.

[0064] In Table 1, the total amount of magnesia particles, magnesia fine powder, magnesia-aluminum spinel particles, light spinel particles and calcined spinel micropowder is calculated in 100%, and the quality of the binding agent is represented by magnesia particles, The percentage content of the total mass of magnesia fine powder, magnesium aluminum spinel particles, light spinel particles and calcined spinel powder.

[0065] Table 1 Raw materials and addition amount used in the preparation of low thermal conductivity refractory materials in Examples 1-4

[0066]

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Abstract

The invention provides a low-thermal-conductivity refractory material, a low-thermal-conductivity refractory brick, a preparation method of the low-thermal-conductivity refractory brick and application, and belongs to the technical field of refractory materials. The low-thermal-conductivity refractory material is prepared from the following raw materials: magnesia particles, magnesia fine powder, magnesium aluminate spinel particles, light spinel particles, calcined spinel micro powder and a binding agent. The low-thermal-conductivity refractory brick prepared by taking the low-thermal-conductivity refractory material as a raw material is stable in high-temperature performance, resistant to corrosion of alkali metals, volatile salts and the like, and suitable for a severe environment of a rotary cement kiln or a rotary lime kiln. Meanwhile, the low-heat-conduction refractory brick avoids the problem of Cr<6+> public nuisance pollution of magnesite-chrome bricks, has the characteristics of high strength, low heat conduction, wear resistance, high-temperature load resistance and the like, can meet the requirements of high-temperature strength and mechanical flexibility in use of a cement rotary kiln or a lime rotary kiln, can effectively reduce the dead weight of a rotary kiln and the temperature of a barrel body, reduces te energy and equipment consumption, and improves the service life of the brick for the rotary kiln.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a low thermal conductivity refractory material, a low thermal conductivity refractory brick and a preparation method and application thereof. Background technique [0002] Magnesia-chrome bricks are widely used as refractory bricks in high-temperature kilns such as cement rotary kilns or lime rotary kilns, but after the use of magnesia-chrome bricks, some of the chromium from Cr 3+ into highly toxic and carcinogenic Cr 6+ , damage the environment and affect people's health. Therefore, the development of chromium-free refractory products is the development direction of refractory materials. [0003] In recent years, a large number of researches on substitute materials for magnesia-chrome bricks have been carried out at home and abroad. At present, magnesia-alumina spinel bricks and magnesia-iron spinel bricks are gradually being promoted and used, which are graduall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043
CPCC04B35/043C04B2235/3217C04B2235/602C04B2235/606C04B2235/656C04B2235/6567C04B2235/5436C04B2235/5427C04B2235/77C04B2235/96C04B2235/9607
Inventor 王桂鹏芦贻春芦建农高洪月
Owner MARVELS REFRACTORIES ANSHAN CO LTD
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