High-performance magnesia-carbon brick and production method thereof

Abstract

The invention discloses a magnesia-carbon brick for a steelmaking converter and a steel ladle and a production method of the magnesia-carbon brick. The magnesia-carbon brick is prepared from the raw materials in percentage by weight: 72-83 percent of sintered magnesia, 3-15 percent of graphite grain, 1-15 percent of antioxidant and 2-5 percent of binder. The preparation method comprises the steps: (1) carrying out mechanical crushing on massive magnesia, then sending the crushed massive magnesia into a ball mill, and carrying out fine grinding on the crushed massive magnesia to prepare the magnesia in five specifications; and (2) carrying out burdening according to the required weight percentage, sending the burdened materials into a mixer to carry out mulling, adding coarse-grained magnesia, a thermosetting phenol-formaldehyde resin binder, the graphite grains and a mixed powder of fine-grained magnesia and the antioxidant into the mixer sequentially, carrying out material mixing for more than 25 minutes, and carrying out processing forming finally. According to the magnesia-carbon brick and the production method disclosed by the invention, as the graphite grains are adopted to replace crystalline flake graphite, the material yield is increased, and the spalling resistance and the structure spalling resistance of the materials are improved.

Description

technical field [0001] The invention relates to the technical field of refractory materials, in particular to a magnesia-carbon brick for a steelmaking system and a preparation method thereof. Background technique [0002] Up to now, magnesia carbon brick (MgO-C) is the main lining material for steelmaking converters and ladles. According to the damage investigation of the used converter and ladle, the damage of magnesia carbon bricks is mainly due to: on the one hand, the oxidation resistance of carbon is poor and easy to oxidize, which leads to poor resistance to slag erosion and peeling of bricks; on the other hand , the carbon used in magnesia-carbon bricks is mainly flake graphite. Because of its unique lamellar structure, when the brick body is formed, it will produce an elastic effect in the direction of parallel pressure forming, resulting in layer cracking and heat transfer anisotropy in the brick body structure. The stress concentration accelerates the failure of ...

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Problems solved by technology

According to the damage investigation of the used converter and ladle, the damage of magnesia carbon bricks is mainly due to: on the one hand, the oxidation resistance of carbon is poor and easy to oxidize, which leads to poor resistance to slag erosion and peeling of bricks; on the other hand , the carbon used in magnesia-carbon bricks is mainly flake graphite. Because of its unique lamellar structure, when the brick body is formed, it will produce an elastic effect in the direction of parallel pressure forming, resulting in layer cracking and heat transfer anisotropy in the brick body structure. Stress concentration accelerates brick structure failure

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