Secondary mould returning method of magnesium carbon brick and alumina-magnesite carbon brick used for steel ladle

Abstract

The invention discloses a secondary mould returning method of magnesium carbon brick and alumina-magnesite carbon brick used for steel ladle. The method includes the following steps: firstly, mixed magnesium carbon brick or alumina-magnesite carbon brick pug used for steel ladle is weighed as required; secondly, the mixed magnesium carbon brick or alumina-magnesite carbon brick pug used for steel ladle is poured into a moulding mould, and primary moulding is carried out; the primary moulding adopts the method of first light hind heavy, step-by-step pressurization and exhaust by hanging and beating, and the thickness of moulded green brick is 0.6-1.6mm higher than design thickness; thirdly, green bricks after primary moulding are piled up, and standing is carried out for 30-60min for natural exhausting; fourthly, the green bricks obtained by the step three are placed into the mould according to mould stripping direction, secondary beating is carried out, the count of the secondary beating is half of the total count regulated by design, and beating pressure is 215-340MPa; fifthly, the green bricks obtained by the step four are subject to sampling inspection, drying, sorting and packaging. The invention has the advantage that lamination crack of magnesium carbon brick and alumina-magnesite carbon brick used for steel ladle is effectively avoided.

Description

technical field [0001] The invention relates to a production method of magnesia-carbon bricks and aluminum-magnesia-carbon bricks for ladles, in particular to a secondary molding method for magnesia-carbon bricks and aluminum-magnesia-carbon bricks for steel ladles. Background technique [0002] Since the magnesia-carbon brick and aluminum-magnesia-carbon brick mud for ladle is mixed with a certain amount of air after mixing, and the temperature of the material after mixing is generally between 20°C and 40°C, if the material after mixing is passed through Forming after trapped material is easy to affect the bonding strength and compactness of adobe. However, if the mixed material is directly formed, since the top, bottom plate and mold of the brick press just form a relatively airtight space, this allows a small amount of air to pass through the gap between the mold, the top and the bottom plate of the brick press. Exhaust, most of the air cannot be exhausted. Therefore, a...

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Problems solved by technology

Therefore, after friction, blowing and other work processes, the temperature of the adobe is further increased, resulting in easy lamination in the adobe. During the use of the ladle brick, with the erosion of the ladle, the molten steel invades the cracks of the ladle brick, which is subjected to high temperature thermal stress. Action bricks are prone to abnormal damage such as peeling and falling blocks, which seriously affects the service life of ladle bricks