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Magnesium-zirconium-calcium bricks for stainless steel smelting kilns

A technology of magnesia-zirconium-calcium brick and stainless steel, applied in the field of refractory materials, can solve problems such as pulverization of kiln lining, unsuitable for gunning and maintenance, and public hazards, and achieve good hydration resistance and suitable for gunning and maintenance

Active Publication Date: 2017-04-19
郑州市科源耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the refractory materials used in stainless steel smelting kilns mainly include magnesia-chrome bricks and magnesia-calcium bricks: 1. Magnesia-chrome bricks will produce Cr during use. 6+ Public nuisance, waste bricks after use are also likely to pollute the environment. Although the country has not enforced the prohibition of use, it does not advocate it. Therefore, the use of chrome-free refractory materials instead of magnesia-chrome bricks is the development trend of stainless steel smelting refractory materials.
2. Magnesia-calcium bricks are also widely used in stainless steel smelting kilns in my country, but the calcium oxide in magnesia-calcium bricks is very easy to absorb moisture, reacts with water vapor in the air, and has the disadvantage of easy hydration. First, the product is not easy to preserve Second, during the use of the kiln, once the furnace is shut down for a long time, the magnesia-calcium brick is very easy to absorb moisture and hydrate the kiln lining; the third is not suitable for gunning maintenance

Method used

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  • Magnesium-zirconium-calcium bricks for stainless steel smelting kilns

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Choose MgO-96 grade for fused magnesia, choose ZrO for desiliconized zirconium 2 -90 grade, lime paste requires crystallization water of slaked lime, and the content of free water contained in it is 25~40%.

[0028] The preparation method of magnesium-zirconium-calcium brick for stainless steel smelting kiln of the present invention is:

[0029] The first step, raw material weighing

[0030] 1) Weigh fused magnesia granules and powder according to the following particle size distribution

[0031] 30 parts of granular materials with a particle size of 5~3mm, 15 parts of granular materials with a particle size of 1mm

[0032] 2) Weigh 8 parts of desiliconized zirconium powder with particle size <0.088mm; 10 parts of lime paste with CaO≥95%; 0.2 parts of industrial dextrin;

[0033] The second step, material mixing

...

Embodiment 2

[0041] Fused magnesia chooses MgO-97 grade, desiliconized zirconium chooses ZrO 2 -98 grade, lime paste requires crystallization water of slaked lime, and the content of free water contained in it is 25~40%.

[0042] The preparation method of magnesium-zirconium-calcium brick for stainless steel smelting kiln of the present invention is:

[0043] The first step, raw material weighing

[0044] 1) Weigh fused magnesia granules and powder according to the following particle size distribution

[0045] 30 parts of granular materials with a particle size of 5~3mm, 15 parts of granular materials with a particle size of 1mm<3mm, 20 parts of granular materials with a particle size of 0.088mm<1mm, and 20 parts of powder materials with a particle size of ≤0.088mm;

[0046] 2) Weigh 8 parts of desiliconized zirconium powder with particle size <0.088mm; 10 parts of lime paste with CaO≥95%; 0.4 parts of industrial dextrin;

[0047] The second step, material mixing

[0048] Add the three...

Embodiment 3

[0055] Fused magnesia chooses MgO-97 grade, desiliconized zirconium chooses ZrO 2 -95 grade, lime paste requires crystallization water of slaked lime, and the content of free water contained in it is 25~40%.

[0056] The preparation method of magnesium-zirconium-calcium brick for stainless steel smelting kiln of the present invention is:

[0057] The first step, raw material weighing

[0058] 1) Weigh fused magnesia granules and powder according to the following particle size distribution

[0059]15 parts of granular materials with a particle size of 5~3mm, 30 parts of granular materials with a particle size of 1mm<3mm, 15 parts of granular materials with a particle size of 0.088mm<≤1mm, and 20 parts of powder materials with a particle size of ≤0.088mm;

[0060] 2) Weigh 12 parts of desiliconized zirconium powder with particle size <0.088mm; 13 parts of lime paste with CaO≥95%; 0.6 parts of industrial dextrin;

[0061] The second step, material mixing

[0062] Put the thre...

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Abstract

The invention discloses a magnesium zirconium calcium brick for a stainless steel smelting kiln. The brick is prepared from the raw materials in parts by weight: 75-85 parts of fused magnesite, 8-16 parts of desilicated zirconium powder, 10-16 parts of lime paste and 0.2-1.0 part of industrial dextrin. The brick is prepared by the steps: firstly weighing the raw materials in proportion, uniformly mixing granules of the fused magnesite, then adding the lime paste and the industrial dextrin to be uniformly mixed with the granules of the fused magnesite, and finally adding the fused magnesite powder and the desilicated zirconium powder to be stirred and mixed; pressing the mixed material to molded green bricks with the volume density of 3.20+ / -0.1 g / cm3; feeding the molded green bricks into a tunnel kiln to be dried; firing the dried green bricks in the kiln, and when the firing temperature reaches 1600-1680 DEG C, insulating the green bricks for 8-16 hours, cooling the green bricks and discharging the bricks to obtain a magnesium zirconium calcium brick finished product for the stainless steel smelting kiln. The magnesium zirconium calcium brick for the stainless steel smelting kiln disclosed by the invention has the advantage that by adding the desilicated zirconium, calcium oxide can be stabilized to the brick bodies, so that the magnesium zirconium calcium brick has an extremely good hydration-resisting capacity; as the magnesium zirconium calcium brick is free of chromium element, the environment is not polluted, and the brick is suitable for being maintained by spray repair.

Description

technical field [0001] The invention relates to a refractory material, in particular to an environment-friendly magnesium-zirconium-calcium brick for a stainless steel smelting kiln. Background technique [0002] With the development of our country's national economy, as an important part of iron and steel metallurgy, stainless steel smelting is also making continuous progress, but the service life of AOD furnace and VOD furnace, the important equipment for stainless steel smelting, has not been very ideal, and the repair technology is also subject to certain restrictions. In this case, continuing to study refractory materials for stainless steel smelting has become an important topic in the future. At present, the refractory materials used in stainless steel smelting kilns mainly include magnesia-chrome bricks and magnesia-calcium bricks: 1. Magnesia-chrome bricks will produce Cr during use. 6+ Public nuisance, waste bricks after use are also easy to pollute the environmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 王国选康华荣董胜英孙福安牛伟海王有权孙阳阳王春波牛全义
Owner 郑州市科源耐火材料有限公司
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