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Brick for rotary kiln firing zone and preparation method thereof

A technology of firing zone and rotary kiln, applied in the field of refractory material preparation, can solve the problems of long firing time, high energy consumption, unfavorable energy saving and emission reduction of magnesia-alumina spinel bricks, and achieves improved thermal shock resistance, high strength and thermal shock resistance, preventing cracking and peeling

Inactive Publication Date: 2021-03-09
ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention mainly uses the basic particle gradation, that is, the combination between particles and the matrix to achieve high strength of the material, and in this invention, the magnesia-alumina spinel bricks are fired for too long and the energy consumption is too high, which is not conducive to energy saving and emission reduction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] In this embodiment, a kind of brick for rotary kiln burning belt, its raw material composition and weight parts are as follows: 30 parts of magnesia-alumina spinel with particle size of 3-5mm, 25 parts of magnesia with particle size of 1-3mm, particle size 12 parts of magnesia-aluminum spinel ≤1mm, 10 parts of magnesia with particle size of -180 mesh, 8 parts of metal aluminum powder with particle size of -350 mesh after pretreatment, and 5 parts of metal magnesium powder with particle size of -200 mesh after pretreatment ; 10 parts of alumina fine powder with a particle size of 5-6 μm; in addition, adding pulp waste liquid according to 3% of the total weight of the above raw materials.

[0034] The pretreated particle size is the preparation method of -350 mesh metal aluminum powder as follows:

[0035] 1) Weigh -350 mesh metal aluminum powder, place it in boiling water 10 times its mass, and stir for 12-24 hours to obtain a suspension;

[0036] 2) filtering the obtai...

Embodiment 2

[0047] In this embodiment, the preparation process of a rotary kiln firing belt brick is the same as that in Embodiment 1. The difference is that in this example, the raw material composition and parts by weight are as follows: 33 parts of magnesia-alumina spinel with a particle size of 3-5 mm, 27 parts of magnesia with a particle size of 1-3 mm, and magnesia-alumina spinel with a particle size of ≤1 mm 8 parts, 13 parts of magnesia with a particle size of -180 mesh, 9 parts of metal aluminum powder with a particle size of -350 mesh after pretreatment, and 4 parts of metal magnesium powder with a particle size of -200 mesh after pretreatment; 6 parts of aluminum micropowder; in addition, add pulp waste liquid according to 4% of the total weight of the above-mentioned raw materials.

[0048] During the preparation process, the drying temperature is 110-120° C., and the drying time is 26 hours. The temperature of high-temperature firing is 1550-1600°C, and the firing time is 5 ...

Embodiment 3

[0051] In this embodiment, the preparation process of a rotary kiln firing belt brick is the same as that in Embodiment 1. The difference is that in this example, the raw material composition and parts by weight are as follows: 27 parts of magnesia-alumina spinel with a particle size of 3-5 mm, 23 parts of magnesia with a particle size of 1-3 mm, and magnesia-alumina spinel with a particle size of ≤1 mm 15 parts, 15 parts of magnesia with a particle size of -180 mesh, 7 parts of metal aluminum powder with a particle size of -350 mesh after pretreatment, 6 parts of metal magnesium powder with a particle size of -200 mesh after pretreatment; 7 parts of aluminum micropowder; in addition, add pulp waste liquid according to 4% of the total weight of the above-mentioned raw materials.

[0052] During the preparation process, the drying temperature is 110-120° C., and the drying time is 26 hours. The temperature of high-temperature firing is 1600-1680°C, and the firing time is 5 hou...

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Abstract

The invention discloses a brick for a rotary kiln firing zone and a preparation method thereof. The brick is prepared from the following raw materials in parts by weight: 25-35 parts of magnesium aluminate spinel with the particle size of 3-5 mm, 20-30 parts of magnesia with the particle size of 1-3 mm, 5-15 parts of magnesium aluminate spinel with the particle size of less than or equal to 1 mm,8-16 parts of magnesia with the particle size of 180 meshes, 6-10 parts of pretreated metal aluminum powder with the particle size of 350 meshes, 4-6 parts of pretreated magnesium powder with the particle size of 200 meshes; and 6-10 parts of alumina micro-powder with the particle size of 5-6 [mu]m; wherein the weight of the pulp waste liquid is 3-4% of the total weight of the raw materials. The preparation method is simple and easy to implement, the prepared brick for a rotary kiln firing zone is high in strength, fibers formed in the brick have a toughening effect, the thermal shock resistance of the fired brick is effectively improved, cracking and peeling of the fired brick are prevented, and the service life of a lining of the rotary kiln firing zone made of lime, cement and the likeis prolonged.

Description

technical field [0001] The invention relates to the technical field of refractory material preparation. In particular, it relates to a method for preparing bricks for firing belts in a rotary kiln. Background technique [0002] Magnesia-aluminum spinel bricks can be used in the firing zone of rotary kilns such as cement and lime. Since the service environment of the rotary kiln not only has strong air scour and dust friction, but also has very large temperature fluctuations, the magnesia-aluminum spinel bricks currently used must not only have high refractoriness, high strength, wear resistance and erosion resistance. Good performance, but also have particularly good thermal shock stability, only in this way can the service life be improved and the cost of kiln dismantling and repairing be reduced. In the prior art, during the formation of a single in-situ magnesia-aluminum spinel, there will be 6-15% residual volume expansion, and large thermal stress cracks will be gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/443C04B35/80
CPCC04B35/443C04B35/62204C04B2235/3206C04B2235/402C04B2235/401C04B2235/3217C04B2235/5427C04B2235/77C04B2235/96C04B2235/5224
Inventor 杨梦刘杰洪艳萍
Owner ACRE COKING & REFRACTORY ENG CONSULTING CORP DALIAN MCC