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

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...

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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 seriously affects the service life of the vanadium extraction converter, but also directly affects The quality of vanadium slag; when using the slag splashing technology to protect the furnace, also due to the low strength of the decarburization layer, it is easy to cause the slag splashing layer and the decarburization layer to fall off together under the scouring of the molten pool, and the slag splashing effect is very unsatisfactory; in view of the above reasons At present, the service life of vanadium extraction converters in China is generally low, generally around 8,000 furnaces, which is far lower than ordinary steelmaking converters; therefore, traditional magnesia carbon bricks are difficult to meet the production needs of vanadium extraction converters, and it is urgent to develop new types of refractory materials

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