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Green low-creep MgO-C brick and preparation method thereof

A low-creep, green technology, applied in the field of green low-creep MgO-C bricks and its preparation, can solve problems such as complex process, increased production cost, and significant environmental impact, and achieve improved accumulation form, enhanced environmental protection effect, and environmental protection good effect

Inactive Publication Date: 2019-12-10
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technical means mainly introduce or form nano-carbon sources (such as carbon nanotubes) in situ to improve the dispersion of carbon sources, thereby slowing down the weakening of the high-temperature performance of MgO-C bricks, but the process is complicated, which significantly improves the preparation time. cost
[0005] (2) The existing technology shows that the main raw materials (magnesia and carbon materials) used in the preparation of MgO-C bricks have no significant negative impact on the environment, but the binders used (mainly phenolic resin, high-temperature asphalt or tar etc.) is not only related to the bonding performance of MgO-C bricks, but also has a significant impact on the environment
At present, the main technical means to improve the hydration resistance of MgO-C bricks is to coat the binder to isolate the outside air, but the binder itself (such as resin) still contains a small amount of water, which will inevitably lead to hydration of MgO-C bricks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A green low-creep MgO-C brick and a preparation method thereof. The preparation method described in this embodiment is:

[0039] The first step, according to the mass ratio of fused magnesia fine powder: titanium diboride fine powder: triethanolamine is 100: (2~3): (4~5), the described fused magnesia fine powder, the The titanium diboride fine powder and the triethanolamine are added into a vertical heating mixer, and mixed uniformly under the condition of 130-135° C. to prepare a mixed fine powder.

[0040] Second step, according to electric fused magnesia particle: described mixed fine powder material: flake graphite: the mass ratio of boric anhydride is 100: (40~42): (3~5): (2~3), described The fused magnesia particles, the mixed fine powder, the graphite flakes and the boric anhydride are added into a vertical heating mixer, and mixed at 140-150°C for 6-8 minutes to prepare a premixed material.

[0041] In the third step, sequentially add 4 to 5 wt% of glycerin an...

Embodiment 2

[0046] A green low-creep MgO-C brick and a preparation method thereof. The preparation method described in this embodiment is:

[0047]The first step, according to the mass ratio of electric fused magnesia fine powder: titanium diboride fine powder: triethanolamine is 100: (2~3): (5~6), described electric fused magnesia fine powder, all The titanium diboride fine powder and the triethanolamine are added into a vertical heating mixer, and mixed uniformly under the condition of 130-135° C. to prepare a mixed fine powder.

[0048] Second step, by electric fused magnesia particle: described mixed fine powder material: flake graphite: the mass ratio of boric anhydride is 100: (41~43): (3~5): (2~3), described The fused magnesia particles, the mixed fine powder, the graphite flakes and the boric anhydride are added into a vertical heating mixer, and mixed at 140-150°C for 6-8 minutes to prepare a premixed material.

[0049] In the third step, sequentially add 4 to 5 wt% of glycerin...

Embodiment 3

[0054] A green low-creep MgO-C brick and a preparation method thereof. The preparation method described in this embodiment is:

[0055] The first step, according to the mass ratio of electric fused magnesia fine powder: titanium diboride fine powder: triethanolamine is 100: (3~4): (4~5), described electric fused magnesia fine powder, all The titanium diboride fine powder and the triethanolamine are added into a vertical heating mixer, and mixed uniformly under the condition of 130-135° C. to prepare a mixed fine powder.

[0056] Second step, according to electric fused magnesia particle: described mixed fine powder: flake graphite: the mass ratio of boric anhydride is 100: (42~44): (4~6): (2~3), described The fused magnesia particles, the mixed fine powder, the graphite flakes and the boric anhydride are added into a vertical heating mixer, and mixed at 140-150°C for 6-8 minutes to prepare a premixed material.

[0057] In the third step, sequentially add 4 to 5 wt% of glycer...

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Abstract

The invention relates to a green low-creep MgO-C brick and a preparation method thereof. The technical scheme of the preparation method comprises the steps: performing batching on fused magnesia finepowder, titanium diboride fine powder and triethanolamine at a mass ratio of 100:(2-4):(4-6), performing even mixing at 130-135 DEG C in a vertical heating mixer so as to obtain a mixed fine powder material, performing batching on fused magnesia particles, the mixed fine powder powder, flake graphite and boric anhydride at a mass ratio of 100:(40-45):(3-6):(2-3), performing even mixing at 140-150DEG C in the vertical heating mixer so as to obtain a premix, adding glycerin with an amount of 4-5% of the weight of the premix and liquid paraffin with an amount of 2-3% of the weight of the premixto the premix, performing mixing at 160-165 DEG C in the vertical heating mixer so as to obtain a mixed material, performing press forming on the mixed material under 55-65 MPa, and performing heat treatment at 220-250 DEG C for 60-90 minutes so as to obtain the green low-creep MgO-C brick. The process is simple and environmentally friendly, the prepared product has a good environmental protectioneffect, low creep at high temperature, hydration resistance and high resistance to slag corrosion.

Description

technical field [0001] The invention belongs to the technical field of MgO-C bricks. Specifically relates to a green low-creep MgO-C brick and a preparation method thereof. Background technique [0002] MgO-C brick is a non-burning carbon composite refractory material made of high melting point MgO and carbon materials, adding non-oxide additives, and combining carbon binders. It can be widely used in converters and electric furnace linings and ladles. Slag lines and other parts. [0003] With the development and continuous development of MgO-C bricks, its high-temperature service performance has attracted more and more attention, and the requirements for functionalization and longevity are getting higher and higher: [0004] (1) At present, the C content in MgO-C bricks is about 10-20%, but during the service process, the C in MgO-C bricks is eroded by molten steel to cause carburization of molten steel (Zhu Boquan, et al. "Research on low-carbon magnesia-carbon bricks C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10C04B111/20C04B111/27C04B111/76
CPCC04B28/105C04B2111/20C04B2111/27C04B2111/763C04B14/321C04B24/122C04B22/0013C04B14/024C04B24/36C04B24/026
Inventor 张寒赵惠忠谈利强谈继星谈振宁徐建新
Owner WUHAN UNIV OF SCI & TECH
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