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Composite mullite brick for special alkaline rotary kiln

A rotary kiln and mullite technology, applied in the field of refractory materials, can solve the problems of labor cost and raw material consumption, poor thermal shock resistance, poor input-output efficiency, etc., and achieve strong international market competitiveness and thermal shock stability. The effect of strong and strong market competitiveness

Inactive Publication Date: 2007-03-21
杨秀琴
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These materials have a common biggest weakness in the process of use, that is, poor thermal shock resistance, so that their service life in the alkaline rotary kiln is not very long, about 3-6 months
Due to the short kiln age, the production cost has been greatly increased, resulting in poor input and output benefits, wasting fuel, consuming manpower and raw materials, reducing output, and reducing product quality, which has also brought inconvenience to production management. less difficult
At present, countries with advanced refractory technology in the world use a large number of magnesia-chrome bricks as lining bricks for the firing zone and transition zone of the rotary kiln, and they also occupy the Chinese market by a large margin. However, this brick has caused serious toxic pollution to the environment and people. , is a world-recognized product that should be eliminated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1. Formula:

[0020] Super high alumina bauxite clinker aggregate 40%, particle size 1-7mm;

[0021] Super high bauxite 15%, particle size 0-1mm;

[0022] Bauxite fine powder 29%, particle size less than or equal to 0.088mm;

[0023] ZrO 2 Stone powder 4%, particle size 0-2mm;

[0024] SiC8%, particle size 1-3mm;

[0025] White clay powder 4%, particle size less than or equal to 0.088mm.

[0026] Sulfurous acid pulp waste liquid, 4% of the total weight of the above materials, the specific gravity is 1.23g / cm 3 . The addition amount of sulfurous acid pulp waste liquid can be adjusted appropriately depending on the air temperature, and the adjustment range is 4-6% of the total weight of the material.

[0027] 2. Production process

[0028] (1) Ingredients: high alumina bauxite clinker aggregate and SiC graded mixing

[0029] ZrO 2 powder + white clay powder mixed in proportion

[0030] Sulfurous acid pulp waste liquid is prepared in proportion

[0031] (2) Mix...

Embodiment 2

[0036] 1. Formula:

[0037] Super high alumina bauxite clinker aggregate 35%, particle size 1-7mm;

[0038] Super high bauxite 13%, particle size 0-1mm;

[0039] Bauxite fine powder 25%, particle size less than or equal to 0.088mm;

[0040] ZrO 2 Stone powder 6%, particle size 0-2mm;

[0041] SiC 16%, particle size 1-3mm;

[0042] White clay powder 5%, particle size less than or equal to 0.088mm.

[0043] Sulfurous acid pulp waste liquid, 5.2% of the total weight of the above materials, the specific gravity is 1.23g / cm 3 (Its weight is calculated separately).

[0044] Two. Preparation process: with embodiment 1.

Embodiment 3

[0046] 1. Formula:

[0047] Super high alumina bauxite clinker aggregate 40%, particle size 1-7mm;

[0048] Super high bauxite 12%, particle size 0-1mm;

[0049] Bauxite fine powder 35%, particle size less than or equal to 0.088mm;

[0050] ZrO 2 Stone powder 2%, particle size 0-2mm;

[0051] SiC8%, particle size 1-3mm;

[0052] White clay powder 3%, particle size less than or equal to 0.088mm.

[0053] Sulfurous acid pulp waste liquid, 5.5% of the total weight of the above materials, the specific gravity is 1.23g / cm 3 (Its weight is calculated separately).

[0054] Two. Preparation process: with embodiment 1.

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Abstract

The present invention relates to one kind of composite mullite brick for special alkaline rotary kin, and belongs to the field of refractory material technology. The composite mullite brick is made with the material including waste sulphite pulp liquid in 4-6 wt%, special grade high alumina bauxite chmotte as aggregate in 35-50 wt%, special grade high alumina bauxite in 12-27 wt%, fine bauxite powder 25-35 wt%, ZrO2 powder 2-6 wt%, SiC 8-16 wt%, and white clay powder 3-5 wt%. The composite mullite brick product has highest operation temperature of 1700 deg.c, high strength, high alkali resistance, high heat shock resistance and other features.

Description

technical field [0001] The invention relates to a mullite composite brick for a special alkaline rotary kiln, which belongs to the field of refractory materials. Background technique [0002] Commonly used refractory lining bricks in the firing zone and transition zone of ordinary alkaline rotary kiln (such as cement rotary kiln, alumina clinker sintering rotary kiln, etc.) include magnesia-alumina spinel brick, magnesia-chrome brick, phosphate high-alumina brick, etc. . These materials have a common biggest weakness in the process of use, that is, poor thermal shock resistance, so that their service life on the alkaline rotary kiln is not very long, about 3-6 months. Due to the short kiln age, the production cost has been greatly increased, resulting in poor input and output benefits, wasting fuel, consuming manpower and raw materials, reducing output, and reducing product quality, which has also brought inconvenience to production management. less difficult. At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/10
Inventor 符宗德
Owner 杨秀琴
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