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Magnesium-manganese spinel refractory material as well as preparation method and application thereof

A magnesium-manganese spinel and refractory technology, applied in the field of refractory materials, can solve the problems of poor thermal shock stability, environmental pollution, poor chemical corrosion resistance of complex composition materials, etc.

Pending Publication Date: 2021-06-25
MARVELS REFRACTORIES ANSHAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Magnesia-chrome refractories are widely used in cement rotary kilns due to their good kiln skin and chemical resistance to cement clinker, but the residual magnesia-chrome bricks after use contain hexavalent chromium compounds (magnesia-chrome bricks Part of the chromium in the 3+ into highly toxic and carcinogenic Cr 6+ ), this compound is a water-soluble carcinogen and will cause long-term pollution to the environment. Therefore, chrome-free refractories for cement rotary kilns are an inevitable trend
[0003] In recent years, the chromium-free refractories used in cement kilns are mainly magnesia-alumina spinel bricks or magnesia-aluminum spinel bricks, of which magnesia-aluminum spinel bricks have better hanging properties than magnesia-alumina spinel bricks. Kiln skin performance, but poor thermal shock stability, mainly used in the firing zone of cement rotary kiln; magnesia-alumina spinel brick thermal shock stability is good, but the performance of hanging kiln skin is poor, mainly used for the transition of cement rotary kiln bring
Therefore, the lining of the cement rotary kiln has never been able to realize the integrated configuration of the whole kiln.
[0004] At the same time, the country gradually pays attention to the promotion of environmental protection integration of rotary kilns. More and more cement or lime rotary kilns need to co-process urban waste. The price change effect of iron ions in the existing magnesia-iron spinel bricks makes them sensitive to the atmosphere in the kiln , this weakness is particularly prominent when used in cement production lines for the purpose of garbage disposal; while magnesia-alumina spinel bricks are in the transition zone without kiln skin protection, and their resistance to chemical erosion of complex composition materials is poor

Method used

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  • Magnesium-manganese spinel refractory material as well as preparation method and application thereof
  • Magnesium-manganese spinel refractory material as well as preparation method and application thereof
  • Magnesium-manganese spinel refractory material as well as preparation method and application thereof

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preparation example Construction

[0047] The present invention also provides a preparation method for the magnesium manganese spinel refractory material described in the above technical solution, comprising the following steps:

[0048] The aluminum compound, the manganese compound and the magnesium compound are subjected to the first mixing, light burning and co-grinding in sequence to obtain a co-milled fine powder;

[0049] performing a second mixing of the co-ground fine powder, magnesia, magnesia-aluminum spinel and binder to obtain a mixed material;

[0050] molding the mixed material to obtain brick adobe;

[0051] The adobe is sintered to obtain the magnesium manganese spinel refractory material.

Embodiment 1

[0064] 53.3 parts of calcined alumina (particle size 0.005-0.015mm, purity 99.5%), 13 parts manganese dioxide (particle size 0.030-0.045mm, purity 72%), 12 parts manganese monoxide (particle size 0.050~0.062, the purity is 75%) and 21.7 parts of magnesium carbonate mixed products are placed in the box and lightly burned at 1400°C for 3h, and co-milled in a 4R3216 Raymond mill for 45min to obtain a particle size of 0.045mm Co-grind fine powder;

[0065] Prepare 2.2kg dextrin solution (1.26g / mL specific gravity) and 0.5kg calcium lignosulfonate solution (1.26g / mL specific gravity) to obtain binder;

[0066] 35kg particle size distribution is 26% 0.088 ~ 0.099mm, 47% 1 ~ 2.999mm, 27% 3 ~ 5mm particle sintered magnesia (the mass percentage of MgO is 97.5%), 22kg particle size distribution is 28% 0.088 ~0.999mm, 45% 1 ~ 2.999mm, 27% 3 ~ 5mm granular fused magnesia (the mass percentage of MgO is 97.2%), 13kg particle size is 0.1 ~ 3mm fused magnesia aluminum spinel ( The sum of th...

Embodiment 2

[0070] 56.7 parts by mass of fused alumina (particle size 0.005-0.02 mm, purity 98.5%), 16 parts manganese dioxide (particle size 0.03-0.04 mm, purity 85%), 10 parts manganese monoxide (particle size (0.03-0.04mm in diameter, 85% in purity) and 17.3 parts of light-burned magnesia are placed in a box and lightly burned at 1450°C for 3 hours, and co-milled in a 4R3216 Raymond mill for 35 minutes to obtain granules Co-ground fine powder with a diameter of 0.045mm;

[0071] Prepare 1.8kg dextrin solution (1.28g / mL specific gravity) and 0.3kg methylcellulose solution (1.28g / mL specific gravity), and 0.5kg sulfurous acid pulp waste liquid to obtain binding agent;

[0072] 42kg particle size distribution is 28% 0.088 ~ 0.999mm, 48% 1 ~ 2.999mm, 24% 3 ~ 5mm particle sintered magnesia (the mass percentage of MgO is 97.5%), 12kg particle size distribution is 29% 0.088 ~0.999mm, 46% 1 ~ 2.999mm, 25% 3 ~ 5mm granular fused magnesia (the mass percentage of MgO is 97.0%), 16kg of sintered ...

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Abstract

The invention belongs to the technical field of refractory materials, and particularly relates to a magnesium-manganese spinel refractory material as well as a preparation method and application thereof. The magnesium-manganese spinel refractory material is prepared by sintering the following preparation raw materials in parts by mass: 75-85 parts of magnesia, 10-20 parts of magnesium aluminate spinel, 1.5-5.0 parts of an aluminum compound, 1.0-5.0 parts of a manganese compound, 1.0-5.0 parts of a magnesium compound and 2.0-3.5 parts of a binding agent. In the invention, the aluminum compound and the manganese compound can form a manganese-aluminum spinel mineral phase, the magnesia, the magnesium compound and the aluminum compound can form a magnesium-aluminum spinel mineral phase, and a periclase mineral phase in the magnesia, the manganese-aluminum spinel mineral phase and the magnesium-aluminum spinel mineral phase are co-melted to form a stable structure, so that the volume stability and the chemical stability of the magnesium-manganese spinel refractory material are improved, and the kiln coating hanging performance, the thermal shock performance and the chemical erosion resistance of the magnesium-manganese spinel refractory material are further improved.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a magnesium manganese spinel refractory material and its preparation method and application. Background technique [0002] Magnesia-chrome refractories are widely used in cement rotary kilns due to their good kiln skin and chemical resistance to cement clinker, but the residual magnesia-chrome bricks after use contain hexavalent chromium compounds (magnesia-chrome bricks Part of the chromium in the 3+ into highly toxic and carcinogenic Cr 6+ ), this compound is a water-soluble carcinogen and will cause long-term pollution to the environment. Therefore, chrome-free refractories for cement rotary kilns are an inevitable trend. [0003] In recent years, the chromium-free refractories used in cement kilns are mainly magnesia-alumina spinel bricks or magnesia-aluminum spinel bricks, of which magnesia-aluminum spinel bricks have better hanging properties than...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/043C04B35/622C04B35/626F27B7/28
CPCC04B35/043C04B35/622C04B35/62605F27B7/28C04B2235/3217C04B2235/3218C04B2235/3222C04B2235/5427C04B2235/5436C04B2235/77C04B2235/96C04B2235/9607C04B2235/9669C04B35/0435C04B35/636C04B35/6365C04B2235/3262C04B2235/3267C04B2235/3265C04B2235/3263C04B2235/5463C04B2235/6567C04B2235/606C04B2235/9684C04B35/6262C04B2235/5472C04B2235/80F27D1/0006
Inventor 芦贻春王桂鹏
Owner MARVELS REFRACTORIES ANSHAN CO LTD
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