Alumina-magnesia-carbon brick

Description

Alumina-magnesia-carbon brick (AMC, APU and KPU grades) is an unfired refractory based on alumina: corundum or high-alumina bauxite. Periclase, usually 5–16 % MgO, and graphite are added to the mix, with resin as the binder. It is the material for those areas of the ladle where the metal erodes the lining and there is little basic slag. The more corundum the brick contains and the purer it is, the higher its erosion resistance and the longer the lining lasts between repairs.

Its main feature is that on heating, periclase and alumina react and form MgO·Al₂O₃ spinel right inside the brick. The reaction comes with a slight expansion, so the lining joints tighten and the metal does not penetrate them. As in magnesia-carbon brick, graphite protects against wetting by slag and absorbs thermal shock during filling and tapping. A tight lining without open joints is one of the main conditions for long ladle life: the metal does not get behind the working lining and does not burn through the safety lining.

Applications include steel ladle walls in the metal zone, the bottom and impact pad area, and ladles of secondary steelmaking units. The ladle slag line is usually lined with magnesia-carbon brick, because the slag there is basic and alumina-magnesia-carbon products are less resistant to it. This combination is a common ladle lining scheme; we select the grade for each zone to suit your shop conditions. The working lining is usually laid over a safety lining of fireclay or high-alumina brick or castable. For the bottom and impact area, products with the highest strength and density are used.

We supply ladle wedges for the ladle radius, straight brick and products to drawing. Refractory products for steel ladle linings are covered by GOST 5341-2016; some grades are made to the manufacturer’s specification. The brick is laid dry or with mortar, according to the design. Store it in a dry, covered area in the original packaging. We calculate the set of wedges from the ladle drawing.

Technical data