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Sintered alumina composite chromium-free magnesia-alumina spinel brick for cement kiln firing zone and preparation method

A composite magnesia-alumina spinel brick and sintered magnesia-alumina spinel technology, which is applied in the field of refractory brick processing, can solve the problems of difficult preparation process, low thermal conductivity, instability, etc., and achieve simple production process and high magnesium content , the effect of prolonging the service life

Inactive Publication Date: 2016-12-14
安徽海螺暹罗耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the development trend of chromium-free refractory materials used in cement kilns, overcomes the disadvantages of high cost, difficult preparation process and instability in redox atmosphere for bricks used in cement kiln firing zone, and provides a sintered corundum A cement kiln with good thermal shock resistance, strong clinker erosion resistance, low thermal conductivity, good kiln skin hanging performance, long service life, low production cost, superior performance and good stability in redox atmosphere Sintered corundum composite chromium-free magnesium-aluminum spinel brick for firing zone and preparation method thereof

Method used

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Effect test

Embodiment 1

[0023] A sintered corundum composite chrome-free magnesia-alumina spinel brick for the firing zone of a cement kiln, characterized in that the raw material composition of the sintered corundum composite magnesia-alumina spinel brick by weight percentage is: 84% sintered magnesium Sand, 15% sintered magnesia-aluminum spinel, 1% sintered corundum, and 3.4% calcium lignosulfonate solution (solid content controlled at 52%) of the total amount of the above-mentioned raw materials are used as binder, and the sintered magnesia Using 97 high-purity sintered magnesia, the sintered magnesia adopts four particle sizes, which are 4.75-1.70mm, 1.70-0.60mm, ≤0.60mm, ≤0.088mm, and the 4.75-1.70mm, 1.70-0.60mm , ≤0.60mm, and ≤0.088mm particle sizes of sintered magnesia accounted for 16%, 18%, 39%, and 11% of the total raw materials, and the sintered magnesia-aluminum spinel uses three particle sizes, respectively 4.75-1.70 mm, 1.70-0.60mm, ≤0.60mm, the sintered magnesia-aluminum spinel with a...

Embodiment 2

[0032] A sintered corundum composite chrome-free magnesia-alumina spinel brick for the firing zone of a cement kiln, characterized in that the raw material composition of the sintered corundum composite magnesia-alumina spinel brick by weight percentage is: 83% sintered magnesium Sand, 12% sintered magnesia-aluminum spinel, 5% sintered corundum, and 2.7% calcium lignosulfonate solution (solid content controlled at 51%) of the above-mentioned total amount of raw materials are used as binders, and the sintered magnesia Using 97 high-purity sintered magnesia, the sintered magnesia adopts four particle sizes, which are 4.75-1.70mm, 1.70-0.60mm, ≤0.60mm, ≤0.088mm, and the 4.75-1.70mm, 1.70-0.60mm , ≤0.60mm, and ≤0.088mm particle sizes of sintered magnesia accounted for 15%, 17%, 42%, and 9% of the total raw materials, respectively. mm, 1.70-0.60mm, ≤0.60mm, the sintered magnesia-aluminum spinel with a particle size of 4.75-1.70mm, 1.70-0.60mm, and ≤0.60mm accounted for 5%, 2%, and ...

Embodiment 3

[0041] A sintered corundum composite chrome-free magnesia-alumina spinel brick for the firing zone of a cement kiln, characterized in that the raw material composition of the sintered corundum composite magnesia-alumina spinel brick in terms of weight percentage is: 86% sintered magnesium Sand, 15% sintered magnesia-aluminum spinel, 4% sintered corundum, and 4.2% calcium lignosulfonate solution (solid content controlled at 55%) of the total amount of the above raw materials are used as binders, and the sintered magnesia Using 97 high-purity sintered magnesia, the sintered magnesia adopts four particle sizes, which are 4.75-1.70mm, 1.70-0.60mm, ≤0.60mm, ≤0.088mm, and the 4.75-1.70mm, 1.70-0.60mm , ≤0.60mm, ≤0.088mm particle size of sintered magnesia accounted for 17%, 19%, 38%, 12% of the total raw materials, respectively, the sintered magnesia-aluminum spinel adopts three particle sizes, respectively 4.75-1.70 mm, 1.70-0.60mm, ≤0.60mm, the sintered magnesia-aluminum spinel wit...

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Abstract

The invention discloses a sintered alumina composite chromium-free magnesia-alumina spinel brick for a cement kiln firing zone and a preparation method. The sintered alumina composite chromium-free magnesia-alumina spinel brick is characterized by comprising the following components in percentage by weight: 80-90% of magnesite clinker, 10-15% of sintered magnesium aluminate spinel, 0.5-5% of sintered alumina, and a calcium lignosulphonate solution which serves as a binding agent and accounts for 1-5% of the total weight of the raw materials. The sintered alumina composite chromium-free magnesia-alumina spinel brick is simple in production process, low in production cost, good in volume density and strength, excellent in thermal shock resistance and erosion resistance, good in redox atmosphere resistance, good in wearing resistance, good in kiln coating resistance and high in load refractoriness temperature, and can be applicable to multiple serious application environments such as cement kiln temperature fluctuation, atmosphere variation and serious chemical erosion. The sintered alumina composite chromium-free magnesia-alumina spinel brick can be applied to a cement rotary kiln firing zone, and is good in fire resistance, large in market potential, applicable to popularization and application, and good in economic and social benefits.

Description

technical field [0001] The invention relates to the technical field of refractory brick processing, in particular to a sintered corundum composite chromium-free magnesium-aluminum spinel brick for a cement kiln firing zone and a preparation method thereof. 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 technology in the precalciner kiln syste...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/443C04B35/622C04B35/634
CPCC04B35/443C04B35/622C04B35/634C04B35/66C04B2235/3217C04B2235/5427C04B2235/5436C04B2235/5445C04B2235/96C04B2235/9607C04B2235/9684
Inventor 杨忠德刘德嵩谢虎林鑫于龙泉
Owner 安徽海螺暹罗耐火材料有限公司
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