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Novel converter magnesia carbon brick and preparation method thereof

A converter magnesia-carbon brick and magnesia-carbon brick technology, which is applied in the field of refractory materials, can solve the problems of thinning profit of converter magnesia-carbon bricks, too late to eliminate, waste of recycled materials, etc., so as to improve utilization, reduce production pressure, and reduce energy consumption. Effect

Active Publication Date: 2013-11-20
WUGANG REFRACTORY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In recent years, on the one hand, due to the increasingly tight resources of various mines at home and abroad, the profits of converter magnesia-carbon brick products have been decreasing day by day, and some companies have even sold at a loss; During the dismantling and replacement process, although it was found that there are still a large number of areas of the product that have not been eroded and damaged, it should be able to continue to be used as recycled materials after processing. Contains "false particles" composed of fine powder. Therefore, when using recycled materials to prepare converter magnesia carbon bricks for the second time, the small pores on the surface of recycled materials contain a certain amount of water, which cannot be removed in the process of pressing and forming. It causes lamination and other phenomena in the product, which restricts the use of recycled materials in converter magnesia carbon bricks and causes a lot of waste of recycled materials

Method used

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  • Novel converter magnesia carbon brick and preparation method thereof
  • Novel converter magnesia carbon brick and preparation method thereof

Examples

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preparation example Construction

[0037] The preparation method of novel converter magnesia carbon brick of the present invention comprises the steps:

[0038] 1) Sorting: Sorting the recycled materials of magnesia carbon bricks, removing the metamorphic layer and surface impurities of the recycled materials;

[0039] 2) Crushing: The selected regenerated materials are crushed to ≤12mm and then subjected to magnetic separation to remove iron mixed in the regenerated materials; and then sieved to remove powders of ≤1mm.

[0040] 3) Heat treatment: heat and dry the regenerated material treated in step 2) at a heating rate of 8~15°C / min, heat it up to 350°C and keep it warm for 6~10h, choose MgO≥75%, SiO 2 ≤3.6%, CaO≤2.2%, Fe 2 o 3 ≤1.9%, Al 2 o 3 ≤4.5% recycled materials for standby;

[0041] 4) Part of the recycled materials treated in step 3) is further crushed and then screened together with the rest of the recycled materials, and two kinds of recycled materials with particle sizes of 1mm

Embodiment 1

[0054] In this example, the new converter magnesia carbon brick is obtained by molding 1 / 4 part of material a and 1 part of material b, wherein in each part of material a, the parts by weight of each component are:

[0055] Fused magnesia, in which the MgO content is ≥ 97.0%, and the fused magnesia with a particle size of 3 mm < particle size ≤ 5 mm: 50 parts by weight; the fused magnesia with a particle size of 0.088 mm < particle size ≤ 3 mm Magnesia: 15 parts by weight; particle size ≤ 0.088mm: 13 parts by weight;

[0056] Graphite: 10 parts by weight;

[0057] Phenolic resin: 2 parts by weight.

[0058] In every part of material b, the parts by weight of each component are:

[0059] Recycled materials that have been sorted, crushed, heat-treated and further crushed, wherein the particle size is 1mm < particle size ≤ 5mm is 35 parts by weight; the particle size is 0 mm < particle size ≤ 1mm is 0 parts by weight;

[0060] Fused magnesia, the MgO content of the fused magne...

Embodiment 2

[0065] In this example, the new converter magnesia carbon brick is formed by 1 part of material a and 1 part of material b, wherein in each part of material a, the parts by weight of each component are:

[0066] Fused magnesia, in the fused magnesia, the MgO content is ≥ 97.0%, and the fused magnesia with a particle size of 3 mm < particle size ≤ 5 mm: 20 parts by weight; the fused magnesia with a particle size of 0.088 mm < particle size ≤ 3 mm Magnesia: 40 parts by weight; particle size ≤ 0.088mm: 25 parts by weight;

[0067] Graphite: 9 parts by weight;

[0068] Phenolic resin: 6 parts by weight.

[0069] In every part of material b, the parts by weight of each component are:

[0070] Recycled materials that have been sorted, crushed, heat-treated and further crushed, wherein the particle size is 1mm < particle size ≤ 5mm is 20 parts by weight; the particle size is 0 mm < particle size ≤ 1mm is 40 parts by weight;

[0071] Fused magnesia, the MgO content of the fused mag...

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Abstract

The invention discloses a novel converter magnesia carbon brick and a preparation method thereof. The method comprises the following steps: 1) sorting and roguing; 2) crushing, and removing false granules; 3) carrying out heat treatment, and selecting a reclaimed material, which contains at least 75% of MgO, at most 3.6% of SiO2, at most 2.2% of CaO, at most 1.9% of Fe2O3 and at most 4.5% of Al2O3, for later use; 4) further crushing part of the reclaimed material subjected to the step 3), and screening the part of the reclaimed material and the rest of reclaimed material; and 5) carrying out pressure molding by a gradient molding technique. The method disclosed by the invention can obviously enhance the utilization ratio of renewable resources, and sufficiently implements reutilization of resources and reduces waste of nonrenewable resources, thereby reducing the energy consumption and the lowering the production pressure of the enterprise. The novel converter magnesia carbon brick prepared by the method has favorable properties, and can well satisfy the production requirements.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a novel converter magnesia-carbon brick and a preparation method thereof. Background technique [0002] Steelmaking converter is a vertical cylindrical furnace that mainly uses liquid pig iron as raw material for steelmaking without external heat source. Its main features are: relying on the physical heat of liquid pig iron in the converter and the heat generated by the chemical reaction of various components in the pig iron (such as carbon, manganese, silicon, phosphorus, etc.) Ingredients and temperature required. According to the properties of lining refractories, it can be divided into two types: acidic converter and basic converter; according to the position where the gas is blown into the furnace, the converter is divided into bottom blowing, top blowing, side blowing and top-bottom composite blowing converter. Magnesia-carbon bricks have high ref...

Claims

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Application Information

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IPC IPC(8): C04B35/66
Inventor 雷中兴周辉周勇龚仕顺刘良兵徐志华秦常杰洪学勤田先明
Owner WUGANG REFRACTORY CO LTD
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