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A kind of chrome-free brick for rh inner lining and preparation method thereof

A chrome brick and lining technology, applied in the field of chrome-free bricks for RH lining and its preparation, can solve the problems of insufficient contact of large particles and difficulty in forming high-strength bonds, etc., and achieve good slag resistance and excellent comprehensive performance , Improving the effect of anti-slag invasion performance

Active Publication Date: 2017-12-15
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Based on the above patents, it can be seen that most of the additives in the prior art are added in the form of powder, and the contact with the large particles is not sufficient, so it is difficult to form a high-strength bond between the two during the sintering process

Method used

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  • A kind of chrome-free brick for rh inner lining and preparation method thereof
  • A kind of chrome-free brick for rh inner lining and preparation method thereof
  • A kind of chrome-free brick for rh inner lining and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Prepare the chrome-free brick for RH inner lining of the present invention, comprise the following steps:

[0044] a. Mix 15 parts by weight of fused magnesia coarse particles, 25 parts by weight of fused magnesia fine particles and 20 parts by weight of fused magnesia fine powder, and preheat to above 550° C. to obtain a magnesia mixture;

[0045] b. Under vacuum, melt 10 parts by weight of aluminum-magnesium alloy at 700-720°C, add it to the magnesia mixture, and mix until all the magnesia particles are coated with a thin layer of aluminum-magnesium alloy;

[0046] c. Add 15 parts by weight of fused zirconia corundum, 15 parts by weight of fused spinel powder, 6 parts by weight of α-alumina micropowder and 5 parts by weight of light-burned magnesia powder in sequence, mix for 40-60 minutes, and then add liquid phenolic resin 5 parts by weight, and then mixed for 40min to obtain the chrome-free brick mixture for RH inner lining;

[0047] d. Press the chrome-free brick...

Embodiment 2

[0050] Prepare the chrome-free brick for RH inner lining of the present invention, comprise the following steps:

[0051] a. Mix 18 parts by weight of fused magnesia coarse particles, 20 parts by weight of fused magnesia fine particles and 25 parts by weight of fused magnesia fine powder, and preheat to above 550° C. to obtain a magnesia mixture;

[0052] b. Under an argon atmosphere, melt 5 parts by weight of aluminum-magnesium alloy at 700-720°C, add it to the magnesia mixture, and mix until all the magnesia particles are coated with a thin layer of aluminum-magnesium alloy ;

[0053] c. Add 10 parts by weight of fused zirconia corundum, 10 parts by weight of fused spinel powder, 3 parts by weight of α-alumina micropowder and 2 parts by weight of light-burned magnesia powder in sequence, mix for 40-60 minutes, and then add liquid phenolic resin 3 parts by weight, and then mixed for 40 minutes to obtain the chrome-free brick mixture for RH inner lining;

[0054] d. Press th...

Embodiment 3

[0057] Prepare the chrome-free brick for RH inner lining of the present invention, comprise the following steps:

[0058] a. Mix 16 parts by weight of fused magnesia coarse particles, 23 parts by weight of fused magnesia fine particles and 22 parts by weight of fused magnesia fine powder, and preheat to above 550° C. to obtain a magnesia mixture;

[0059] b. Under an argon atmosphere, melt 8 parts by weight of aluminum-magnesium alloy at 700-720°C, add it to the magnesia mixture, and mix well until all the magnesia particles are coated with a thin layer of aluminum-magnesium alloy ;

[0060] c. Add 14 parts by weight of fused zirconia corundum, 13 parts by weight of fused spinel powder, 4 parts by weight of α-alumina micropowder and 3 parts by weight of light-burned magnesia powder in sequence, mix for 40-60 minutes, and then add liquid phenolic resin 4 parts by weight, and then mixed for 40min to obtain the chrome-free brick mixture for RH inner lining;

[0061] d. Press th...

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Abstract

The invention relates to a refractory material and a preparation method thereof, in particular to a chrome-free brick for RH inner lining and a preparation method thereof. A chrome-free brick for RH inner lining of the present invention is prepared from the following components in parts by weight: 15-18 parts of fused magnesia coarse particles; 20-25 parts of fused magnesia fine particles; fused magnesia fine powder 20-25 parts; light-burned magnesia powder 2-5 parts; α-alumina micro-powder 3-6 parts; aluminum-magnesium alloy 5-10 parts; fused spinel powder 10-15 parts; fused zirconia corundum 10-15 parts parts; 3 to 5 parts of liquid phenolic resin. The chrome-free brick for RH inner lining prepared by the invention not only has a simple production method, but also has the characteristics of good slag resistance, high temperature strength, and high density. The raw material does not contain chromium, is environmentally friendly, and its comprehensive performance is better than magnesium Chrome tiles.

Description

technical field [0001] The invention relates to a refractory material and a preparation method thereof, in particular to a chrome-free brick for RH inner lining and a preparation method thereof. Background technique [0002] In 1957, German Thyssen Steel Company invented the vacuum cycle degassing-RH method. In the 1970s and 1980s, Japan successively developed the RH-OB method, RH-KTB method and RH-PB method, and continuously improved the refining of RH. Features. As the market has higher and higher requirements for the cleanliness of steel and the demand for high-quality steel increases, most steel mills at home and abroad have been equipped with RH refining devices. Magnesia-chrome bricks are commonly used as RH linings. However, Cr(Ⅲ) reacts with CaO in slag to form Cr(Ⅵ) in a high-temperature oxidizing atmosphere, causing environmental pollution. As environmental protection requirements become more and more stringent, it is necessary to develop chrome-free bricks to re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66
Inventor 李龙李冬梅陈永刘丰强杨强曾建华戈文荪李扬洲李平凡杨大刚王军
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP