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Low-thermal-conductivity spinel refractory homogeneous brick as well as preparation method and application thereof

A spinel-based, low thermal conductivity technology, applied in the field of refractory materials, can solve the problems of low thermal conductivity, high temperature load resistance, etc., and achieve stable high temperature performance, low thermal conductivity, high temperature load resistance and good erosion performance

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

[0006] The purpose of the present invention is to provide a low thermal conductivity spinel refractory homogeneous brick and its preparation method and application. The material of the low thermal conductivity spinel refractory homogeneous brick provided by the present invention is uniform, and there is no composite structure formed by different materials It is prone to hidden dangers in weak parts, and there will be no problem of composite brick fracture during use; and the low thermal conductivity spinel refractory homogeneous brick provided by the present invention has the characteristics of high strength, low thermal conductivity, and high temperature load resistance, and can reach cement Requirements for high temperature strength and mechanical flexibility used in rotary kilns or lime calcining kilns

Method used

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  • Low-thermal-conductivity spinel refractory homogeneous brick as well as preparation method and application thereof
  • Low-thermal-conductivity spinel refractory homogeneous brick as well as preparation method and application thereof
  • Low-thermal-conductivity spinel refractory homogeneous brick as well as preparation method and application thereof

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preparation example Construction

[0034] The present invention provides a method for preparing low thermal conductivity spinel refractory homogeneous bricks described in the above technical solution, comprising the following steps:

[0035] performing the first mixing of magnesia particles, magnesia-alumina spinel particles and lightweight hollow spheres to obtain a first mixed material;

[0036] performing a second mixing of the first mixed material and a binder to obtain a second mixed material;

[0037] The second mixed material, magnesia fine powder and additive fine powder are mixed for the third time to obtain the third mixed material;

[0038] The third mixed material is sequentially pressed and fired to obtain a low thermal conductivity spinel refractory homogeneous brick.

[0039] In the invention, the magnesia particles, the magnesium-aluminum spinel particles and the light hollow spheres are first mixed to obtain the first mixed material. In the present invention, the time for the first mixing is ...

Embodiment 1～5

[0048] Magnesia particles, magnesium aluminum spinel particles and lightweight hollow spheres (density ≤ 1.3g / cm 3 , hollow ratio ≥ 99%) is placed in the mixer, and the first mixing is carried out under the condition that the stirring rotor speed is 200rpm to obtain the first mixed material;

[0049] The first mixed material and the binder are mixed for the second time under the condition that the rotating speed of the stirring rotor is 200rpm to obtain the second mixed material;

[0050] The second mixed material, magnesia fine powder and additive fine powder are mixed for the third time under the condition that the stirring rotor speed is 200rpm to obtain the third mixed material;

[0051] Pressing the third mixed material, drying the obtained green body and firing it in a high-temperature tunnel kiln to obtain a spinel refractory homogeneous brick with low thermal conductivity;

[0052] The raw materials and addition amounts used in the preparation of low thermal conductiv...

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Abstract

The invention provides a low-thermal-conductivity spinel refractory homogeneous brick as well as a preparation method and application thereof, and belongs to the technical field of refractory materials. The low-thermal-conductivity spinel refractory homogeneous brick provided by the invention is prepared from the following raw materials: magnesia particles, magnesia fine powder, magnesium aluminate spinel particles, light hollow spheres, additive micro powder and a binding agent. The low-thermal-conductivity spinel fire-resistant homogeneous brick provided by the invention is uniform in material, the hidden danger that weak parts are easy to appear in a composite structure formed by different materials is avoided, and the problem that the composite brick is broken in the use process is avoided. Meanwhile, the low-thermal-conductivity spinel refractory homogeneous brick provided by the invention takes a periclase-spinel system as a matrix, is stable in high-temperature performance, is resistant to corrosion of alkali metals, volatile salts and the like, and is suitable for severe environments of rotary cement kilns or lime calcining kilns.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a spinel refractory homogeneous brick with low thermal conductivity and its preparation method and application. Background technique [0002] Magnesia-chrome bricks are widely used as refractory bricks in high-temperature kilns such as cement rotary kilns or lime calcination kilns. 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 gradually replacing magnesia-chrome bricks in the firing zone and transition of rotary kilns. belt use. H...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043
CPCC04B35/043C04B2235/3217C04B2235/3222C04B2235/3244C04B2235/5436C04B2235/5427C04B2235/602C04B2235/606C04B2235/656C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607C04B2235/9669
Inventor 王桂鹏芦贻春芦建农高洪月
Owner MARVELS REFRACTORIES ANSHAN CO LTD
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