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High-iron magnesite and sintered corundum sintered composite non-chromium high-iron magnesium brick and preparation method thereof

A technology of high-iron magnesia and sintered corundum, which is applied in the field of refractory materials, can solve the problems of unfavorable iron-aluminum spinel synthesis, difficulty in adding synthetic iron-aluminum spinel, and difficult control, and achieve high cost, low price, and reduced production cost effect

Inactive Publication Date: 2015-04-22
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to control a suitable weakly reducing atmosphere, and the lower temperature is not conducive to the synthesis of iron-aluminum spinel. These factors add considerable difficulty to the synthesis of iron-aluminum spinel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: A method for preparing high-iron magnesia-sintered corundum composite chromium-free high-iron magnesia bricks for cement kilns. The raw materials are composed of 94% high-iron magnesia, 6% sintered corundum, Add 2.5% sulfurous acid pulp waste liquid.

[0025] During production, firstly weigh various raw materials according to the ratio, mix them evenly, and get the mud material through mixing, and then press it into shape with a friction press, dry it at 80°C-200°C for 5-25h, and place it in a tunnel kiln at 1400-1650°C Firing at high temperature.

[0026] The powder is high-iron magnesia and sintered corundum with a particle size of less than 0.088 mm, and the aggregate particle size is high-iron magnesia with a particle size of 3-1 mm and 1-0 mm.

[0027] The performance index of the obtained product is: apparent porosity 17.3%, bulk density 2.96g / cm 3 , normal temperature compressive strength 81MPa, load softening temperature greater than 1700 ℃, thermal...

Embodiment 2

[0028] Embodiment 2: production technology is identical with embodiment 1, and difference is:

[0029] In terms of weight percentage, the raw material composition is: 91% of high-iron magnesia, 9% of sintered corundum, and 2.5% of sulfurous acid pulp waste liquid. The powder is high-iron magnesia and sintered corundum with a particle size of less than 0.088 mm, and the aggregate particle size is high-iron magnesia with a particle size of 3-1 mm and 1-0 mm.

[0030] The performance index of the obtained product is: apparent porosity 18.8%, bulk density 2.91g / cm 3 , normal temperature compressive strength 60MPa, load softening temperature 1680 ℃, thermal shock stability (1100 ℃, water cooling) 13 times, its erosion resistance, wear resistance and kiln skin hanging performance are good.

Embodiment 3

[0031] Embodiment 3: production process is identical with embodiment 1, and difference is:

[0032] In terms of weight percentage, the raw material composition is: 91% of high-iron magnesia, 9% of sintered corundum, and 2.5% of sulfurous acid pulp waste liquid. The powder is high iron magnesia and sintered corundum with particle size less than 0.088mm, and the aggregate particle size is 3-1mm, 1-0mm high iron magnesia and 3-2mm sintered corundum.

[0033] The performance index of the obtained product is: apparent porosity 16.8%, bulk density 2.99g / cm 3 , normal temperature compressive strength 90MPa, load softening temperature 1660 ℃, thermal shock stability (1100 ℃, water cooling) 16 times, its erosion resistance, wear resistance and kiln skin hanging performance are good.

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Abstract

The invention relates to a high-iron magnesite and sintered corundum sintered composite non-chromium high-iron magnesium brick and a preparation method thereof, and belongs to the field of fire resistant materials. The composite non-chromium high-iron magnesium brick is prepared from the following raw materials by weight percent: 80% to 99% of high-iron magnesite and 1% to 2% of sintered corundum, wherein lignosulfite which accounts for 1% to 5% of the total weight of the high-iron magnesite and the sintered corundum is added and taken as a bonding agent. The preparation method comprises the following steps: weighing the raw materials in proportion and evenly mixing so as to obtain a material slurry; pressing the material slurry in a molding manner; drying for 5 to 25 hours at 80 DEG C to 200 DEG C; and sintering at a high temperature of 1400 DEG C to 1650 DEG C in a tunnel kiln. The composite non-chromium high-iron magnesium brick is simple in production process, low in raw material price, low in production cost, high in volume density and strength, good in thermal shock stability, resistant to erosion, resistant to abrasion as well as high in refractoriness under load and has the kiln coating hanging performance, thereby meeting the requirements of nasty application environments, namely, the temperature fluctuations, the atmosphere changes and the chemical erosions of a cement kiln are serious and the like. The composite non-chromium high-iron magnesium brick is applied to a high-temperature zone of the rotary cement kiln and has a large market potential, thereby being suitable for popularization applications and having good social benefits.

Description

technical field [0001] The invention relates to preparing a refractory material for a cement kiln, in particular to a high-iron magnesia-sintered corundum composite chromium-free high-iron magnesia brick for a cement kiln and a preparation method, belonging to the field of refractory materials. Background technique [0002] The cement rotary kiln has gone through a long process of evolution and development. The development trend of the cement industrial kiln has two aspects: one is the resource reuse of various industrial wastes and the use of low-grade raw materials, making the cement kiln an industrial waste. Consumers, because the combustion of these wastes increases the circulation of alkali, chlorine, and sulfur in the cement kiln, the erosion of refractory materials will be intensified, and the skinning problem will be more serious; the second is to reduce NOx emissions from cement kilns. The jet channel coal injection pipes being developed and the use of staged fuel t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/622
Inventor 李勇冯运生林鑫李平李燕京张军杰
Owner UNIV OF SCI & TECH BEIJING
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