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Nano-matrix-combined high-performance fused magnesium calcium brick and manufacturing method thereof

A fused magnesia-calcium brick, nano-scale technology, applied in the field of nano-scale matrix combined with high-performance fused magnesia-calcium bricks and its manufacturing, can solve the problems of poor corrosion resistance of magnesia-calcium bricks, age of magnesia-calcium brick blast furnace, high calcium There are no more mature production technology solutions for magnesia-calcium bricks, and the effects of improving hydration resistance, compressive strength, and good high-temperature volume stability are achieved.

Active Publication Date: 2015-09-02
LIAONING ZHONGMEI HIGH TEMPERATURE MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the performance of magnesia-calcium bricks can no longer meet the age and low-cost target requirements of steel mills. For example, a 180-ton AOD furnace in a domestic steel plant has poor corrosion resistance due to the poor corrosion resistance of magnesia-calcium bricks in the wind eye area and slag line. In addition, due to the easy hydration of magnesia-calcium bricks, there is still no mature production technology solution for high-calcium magnesia-calcium bricks (CaO≥35%) with a stronger ability to purify molten steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A nano-scale matrix combined with high-performance fused magnesia-calcium brick is made of the following raw materials in proportion by weight:

[0034] 5 parts of 8~5mm high-calcium fused magnesia-calcium sand,

[0035] 25 parts of 5~2mm high-calcium fused magnesia-calcium sand,

[0036] 25 parts of 2~0mm high-calcium fused magnesia-calcium sand,

[0037] ≤ 0.074mm High-calcium fused magnesia-calcium sand fine powder 10 parts,

[0038] 5 parts of 8~5mm fused magnesia,

[0039] 5~2mm fused magnesia 10 parts,

[0040] 2~0mm fused magnesia 5 parts,

[0041] ≤ 0.074mm fused magnesia fine powder 10 parts,

[0042] Nanoscale seawater magnesia fine powder 5 parts,

[0043] Binder 2~5 parts.

[0044] The physical and chemical indicators of the nano-scale seawater magnesia fine powder, high-calcium fused magnesia-calcium sand, and fused magnesia are as follows:

[0045] project Nano-scale seawater magnesia fine powder High calcium fused magnesia calcium san...

Embodiment 2

[0057] A nano-scale matrix combined with high-performance fused magnesia-calcium brick is made of the following raw materials in proportion by weight:

[0058] 5 parts of 8~5mm high-calcium fused magnesia-calcium sand,

[0059] 5~2mm high calcium fused magnesia calcium sand 30 parts,

[0060] 25 parts of 2~0mm high-calcium fused magnesia-calcium sand,

[0061] ≤ 0.074mm high calcium fused magnesia calcium sand fine powder 15 parts,

[0062] 5 parts of 8~5mm fused magnesia,

[0063] 5 parts of 5~2mm fused magnesia,

[0064] 2~0mm fused magnesia 5 parts,

[0065] ≤ 0.074mm fused magnesia fine powder 5 parts,

[0066] Nanoscale seawater magnesia fine powder 5 parts,

[0067] Binder 2~5 parts.

[0068] The physical and chemical indicators of the nano-scale seawater magnesia fine powder, high-calcium fused magnesia-calcium sand, and fused magnesia are as follows:

[0069] project Nano-scale seawater magnesia fine powder High calcium fused magnesia calcium sand ...

Embodiment 3

[0073] A nano-scale matrix combined with high-performance fused magnesia-calcium brick is made of the following raw materials in proportion by weight:

[0074] 8mm~5mm high-calcium fused magnesia-calcium sand 5 parts,

[0075] 5mm~2mm high-calcium fused magnesia-calcium sand 35 parts,

[0076] 2mm~0mm high-calcium fused magnesia-calcium sand 30 parts,

[0077] ≤ 0.074mm high calcium fused magnesia calcium sand fine powder 15 parts,

[0078] 8mm~5mm fused magnesia 5 parts,

[0079] ≤ 0.074mm fused magnesia fine powder 5 parts,

[0080] Nanoscale seawater magnesia fine powder 5 parts,

[0081] Binder 2~5 parts.

[0082] The physical and chemical indicators of the nano-scale seawater magnesia fine powder, high-calcium fused magnesia-calcium sand, and fused magnesia are as follows:

[0083] project Nano-scale seawater magnesia fine powder High calcium fused magnesia calcium sand Fused magnesia MgO, % ≥98.00 ≥50.00 ≥97.00 CaO, % ≤1.00 ≥48.00 ≤1....

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Abstract

The invention provides a nano-matrix-combined high-performance fused magnesium calcium brick and a manufacturing method thereof. The fused magnesium calcium brick is prepared from 8-5mm high-calcium fused magnesium calcium sand, 5-2mm high-calcium fused magnesium calcium sand, 2-0mm high-calcium fused magnesium calcium sand, <=0.074mm high-calcium fused magnesium calcium sand, 8-5mm fused magnesite, 5-2mm fused magnesite, 2-0mm fused magnesite, <=0.074mm fused magnesite fine powder, nano sea water magnesia fine powder and a binder paraffin. The manufacturing method comprises the following steps: fine powder premixing, integral compounding, molding, drying, firing and the like. The product has the advantages of compact microstructure, fewer low-melting-point minerals, higher erosion resistance, higher scour resistance, higher stripping resistance and higher hydration resistance. The furnace life is prolonged by 30% above on average. Thus, the product satisfies the requirements of high efficiency, long service life and high cleanness for stainless steel and special steel smelting, and lowers the cost for the steel enterprises.

Description

technical field [0001] The invention relates to a nanoscale matrix combined with high-performance fused magnesia-calcium brick and a manufacturing method thereof, belonging to the technical field of refractory materials for special steel smelting furnaces such as stainless steel. Background technique [0002] As we all know, magnesia-calcium brick has become an indispensable and difficult to replace refractory material for special steel smelting equipment such as stainless steel. At present, domestic magnesia-calcium bricks use fired dolomite sand (sintered magnesia-calcium sand) and fused magnesia as the main raw materials to produce magnesia-calcium bricks. The physical and chemical indicators and performance of magnesia-calcium brick products have the following problems, such as: SiO 2 、Al 2 o 3 , Fe 2 o 3 The sum of the three impurities is 2~3%, the impurity content is too high, and it reacts with molten steel and slag to form more low-melting substances, which is no...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 苏广深杨永刚
Owner LIAONING ZHONGMEI HIGH TEMPERATURE MATERIAL CO LTD
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