Magnesium-iron-carbon brick used for vanadium-extracting converter and preparation method thereof

A magnesia-iron-carbon brick and converter technology, applied in the field of refractory materials, can solve the problems affecting the service life of the vanadium extraction converter, the low service life of the vanadium extraction converter, the slag splashing layer and the decarburization layer falling off, etc., achieving good application prospects and maintaining The effect of anti-slag permeability and simple preparation method

Active Publication Date: 2013-11-13
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Vanadium-titanium-magnetite is a characteristic resource in China, and the use of converters to extract vanadium from molten iron and semi-steel smelting is a vanadium extraction process widely used in China; however, due to the low temperature (about 1400 °C) , High oxidizing, acidic environment, after the magnesia carbon brick is oxidized to form a decarburization layer, the magnesia particles in the decarburization layer are difficult to sinter at a low temperature of about 1400 ℃; therefore, the magnesia carbon in the vanadium extraction converter Once the decarburization layer is formed on the brick, the strength of the decarburization layer is very low because it cannot be sintered well, and it is easy to fall off under the scouring of the molten pool during the smelting process, which not only seriousl

Method used

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  • Magnesium-iron-carbon brick used for vanadium-extracting converter and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0024] Example 1

[0025] The weight content of MgO in the fused magnesia used is 97%, the particle size of the fused magnesia is ≤3mm; the weight content of flake fixed carbon in the scaly graphite used is 94%, and the particle size of the scaly graphite is ≤0.15mm; The weight purity of the iron powder is 95%, and the iron powder particle size is ≤200 mesh; the organic binder used is phenolic resin, and the weight content of fixed carbon is 45%; the antioxidant used is aluminum powder, the weight purity is 99%, and the particle size is ≤300 mesh ;

[0026] Mix fused magnesia, flake graphite, iron powder and phenolic resin, then add aluminum powder, put all the materials into the sand mixer, and mix for 25 minutes to obtain the mixture;

[0027] Use a friction press to press the mixture into a shape under a pressure of 250MPa to make a brick;

[0028] The bricks were heat treated for 24 hours at a temperature of 200°C to obtain magnesium-iron carbon bricks for vanadium extraction con...

Example Embodiment

[0031] Example 2

[0032] The weight content of MgO in the fused magnesia used is 97%, the particle size of the fused magnesia is ≤3mm; the weight content of flake fixed carbon in the scaly graphite used is 98%, and the particle size of the scaly graphite is ≤0.15mm; The weight purity of the iron powder is 95%, and the iron powder particle size is ≤200 mesh; the organic binder used is phenolic resin, and the weight content of fixed carbon is 46%; the antioxidant is aluminum powder, the weight purity is 99%, and the particle size is ≤300 mesh ;

[0033] Mix fused magnesia, flake graphite, iron powder and phenolic resin, then add aluminum powder, put all the materials in the sand mixer, and mix for 30 minutes to obtain the mixture;

[0034] Use a friction press to press the mixture into a shape under a pressure of 250MPa to make a brick;

[0035] The bricks are heat treated for 24 hours at a temperature of 250°C to obtain magnesium-iron carbon bricks for vanadium extraction converters....

Example Embodiment

[0038] Example 3

[0039] The weight content of MgO in the fused magnesia used is 97%, and the particle size of the fused magnesia is ≤3mm; the weight content of fixed carbon in the flake graphite used is 90%, and the particle size of the flake graphite is ≤0.15mm; The weight purity of the iron powder is 95%, the particle size of the iron powder is ≤325 mesh; the organic binder used is phenolic resin, and the weight content of fixed carbon is 47%;

[0040] Mix fused magnesia, flake graphite, iron powder and phenolic resin, put all the materials into the sand mixer, and mix for 20 minutes to obtain the mixture;

[0041] Use a friction press to press the mixture into a shape under a pressure of 250MPa to make a brick;

[0042] The bricks are subjected to heat treatment at 250℃ for 24 hours to obtain magnesium iron carbon bricks for vanadium extraction converters. The composition contains 71% fused magnesia, 18% flake graphite, 8% iron powder, and mesh in weight percentage. Fixed carbon...

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Abstract

The invention relates to a magnesium-iron-carbon brick used for a vanadium-extracting converter and a preparation method thereof, and belongs to the technical field of refractory materials. The brick comprises, by weight, 62-84% of fused magnesite clinker, 10-18% of flaky graphite, 5-12% of iron powder, 1-3% of netted fixed carbon and 0-5% of an anti-oxidant. The preparation method comprises (1) a step of mixing the fused magnesite clinker, the flaky graphite, the iron powder and an organic binding agent, adding or not adding the anti-oxidant, and mixing uniformly to obtain a mixture; (2) a step of subjecting the mixture to compression moulding under a pressure of 200-250 MPa to prepare an unburned brick; and (3) a step of subjecting the unburned brick to heat treatment at 150-250 DEG C for 12-32 h to obtain the magnesium-iron-carbon brick. The brick provided by the invention has good practical performances and the simple preparation method, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a magnesia-iron-carbon brick for a vanadium extraction converter and a preparation method thereof. Background technique [0002] Due to its good slag erosion resistance, thermal shock resistance and high temperature strength, magnesia carbon bricks are widely used as working linings for steelmaking converters, which has revolutionized the service life of converters; especially since the advent of slag splashing furnace protection technology, it will The combination of magnesia carbon bricks and slag splashing furnace protection technology makes the life of the converter reach 20,000 furnace times or even higher. As we all know, the magnesia-carbon bricks used for the working lining of steelmaking converters work in the environment of high temperature, high oxidation and high alkalinity above 1600 ℃. Once the carbon in the magnesia-carbon bricks is oxidize...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 陈敏黄伟军王楠
Owner NORTHEASTERN UNIV
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