Chrome-free brick for RH (Ruhrstahl Heraeus) furnace vacuum chamber and preparation method of chrome-free brick

A vacuum chamber and chrome brick technology, applied in the field of smelting refractory materials, can solve problems such as limited application scope, and achieve the effects of broad market prospects, good high temperature slag corrosion resistance, and high thermal shock resistance.

Active Publication Date: 2014-05-28
WUGANG REFRACTORY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The initial purpose of RH development is to dehydrogenate molten steel to prevent white spots in steel, so RH is only used to deal with steel types that hav

Method used

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  • Chrome-free brick for RH (Ruhrstahl Heraeus) furnace vacuum chamber and preparation method of chrome-free brick

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) By weight percentage: 70% of fused magnesia with a particle size of 0.074-5mm, 17% of spinel fine powder with a particle size of 0.074mm, 3% of zirconia fine powder with a particle size of 60-80nm, and a particle size of 200 mesh Titanium dioxide 8%, macromolecular organic binding agent 2%, described macromolecular organic binding agent is the calcium lignosulfonate solution of the zirconium dioxide sol of zirconia content 20wt% and lignin content 60wt% according to mass percent: 2:1 mixed mixture, weigh each component, set aside;

[0019] (2) Mixing: put the weighed fused magnesia, spinel fine powder, zirconia fine powder, and titanium dioxide into a mixer and mix them evenly; then add a polymer organic binder and stir Uniform;

[0020] (3) Compression forming;

[0021] (4) Sintering at 1600°C for 8 hours after drying and curing;

[0022] (5) Cool naturally to room temperature to obtain chrome-free bricks for RH vacuum chambers.

Embodiment 2

[0024] (1) Calculated by weight percentage: 84% of sintered magnesia with a particle size of 0.074-5mm, 9% of spinel fine powder with a particle size of 0.074mm, 1% of zirconia fine powder with a particle size of 60-80nm, and a particle size of 325 mesh Titanium dioxide 5%, macromolecular organic binder 1%, described macromolecular organic binder is the titanium dioxide sol that titanium dioxide content is 20wt%, weighs each component, standby;

[0025] (2) Mixing: add part of polymeric organic binder to the weighed spinel fine powder and zirconia fine powder, the amount of which accounts for 40wt% of the total amount of polymeric organic binder; Titanium dioxide, put it into a mixer and dry mix it evenly, then add sintered magnesia with a particle size, after mixing evenly, add the remaining polymer organic binder, and stir evenly;

[0026] (3) Compression forming;

[0027] (4) Sintering at 1900°C for 4 hours after drying and curing;

[0028] (5) Cool naturally to room temp...

Embodiment 3

[0030] (1) Calculated by weight percentage: 93% of sintered magnesia with a particle size of 0.074-5mm, 2% of spinel fine powder with a particle size of <0.074mm, 1% of zirconia fine powder with a particle size of 60-80nm, and a particle size of 1% of 325-purpose titanium dioxide, 3% of high molecular organic binder, the high molecular organic binder is titanium dioxide sol, weigh each component, and set aside;

[0031] (2) Mixing: Add part of polymeric organic binder to the above weighed zirconia fine powder and spinel fine powder, the amount of which accounts for 30wt% of the total amount of polymeric organic binder; add titanium Put the white powder into the blender and dry mix evenly, then add sintered magnesia, after mixing evenly, add the remaining polymer organic binder, and stir evenly;

[0032] (3) Compression forming;

[0033] (4) Sintering at 1800°C for 6 hours after drying and curing;

[0034] (5) Cool naturally to room temperature to obtain chrome-free bricks fo...

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Abstract

The invention relates to a chrome-free brick for an RH (Ruhrstahl Heraeus) furnace vacuum chamber, which comprises the following ingredients by weight percentage: 70%-93% of one or a mixture of more than one of fused magnesite, magnesite clinker and high-purity magnesite at a particle size of 0.074-5mm, 2%-17% of spinel fine powder at a particle size of less than or equal to 0.074mm, 1%-3% of zirconium dioxide fine powder at a particle size of 60-80mm, 1%-8% of titanium dioxide at a particle size greater than or equal to 200 meshes, and 1%-3% of high polymer organic binding agent. The brick is free from harmful elements such as chromium, has no pollution to a human body and an environment, meets the limitation of the harmful elements such as chromium in national Industrial Restructuring Guide List (Version 2011), is scientific and reasonable in matrix composition and particle grading, and compact in product structure, and has good high-temperature slag corrosion resistance and thermal shock resistance, higher high-temperature folding strength and a broad market prospect.

Description

technical field [0001] The invention belongs to the field of refractory materials for smelting, and relates to a chrome-free brick and a preparation method thereof, in particular to a chrome-free brick for replacing magnesia-chrome bricks in a RH furnace vacuum chamber and a preparation method thereof. Background technique [0002] The RH (Molten Steel Vacuum Circulation Degassing) process was jointly developed by Ruhrstahl and Heraeus in 1959, and has a history of 50 years. The RH vacuum treatment device is mainly composed of vacuum chamber, dipping pipe (rising pipe, descending pipe), vacuum exhaust pipe, alloy silo, lifting device, argon blowing pipe system and vacuum chamber preheating device. The initial purpose of RH development is to dehydrogenate molten steel to prevent white spots in steel, so RH is only used to deal with steel types that have strict requirements on gas, such as thick plate steel, steel for large forgings, silicon steel and bearings Steel, etc....

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622
Inventor 周辉宋仪杰王忠徐超洪学勤
Owner WUGANG REFRACTORY CO LTD
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