Two Construction Methods of Refractory Castable

A good construction method can help to save refractories, but many many people don’t know how to do it exactly, here are the construction methods of castable for ladle bottom and ladle wall.

Casting of Backing Layer for Ladle Bottom (construction time: 1 day)

    Firstly, fix Refractory Permeable Brick and Well Block, and then plug the inner hole with some resilient staff.

    Secondly, weld some anchoring nails in the middle area of ladle bottom between one well block and another, the vertical and horizontal distances between every two anchoring nails are 25 mm and 30 mm.

    Thirdly, mix backing layer castable for ladle with about 5% of water, and then stir it for about 20 minutes till smooth.

    At last, pave the mixed backing layer refractory castable at the bottom of ladle, and then vibrate it to 100mm in thickness by flat vibrator.

Casting of Backing Layer for Refractory Ladle Wall (construction time: 1 day)

    After maintenance of bottom permanent layer, stick a layer of high alumina fiber mat which is 10 mm in thickness with the ladle shell. Then place the mould right in the middle, flat, no deviation. The mould surface should be clean, smooth and greased for easy demould.

    Lay the mould properly to ensure that the gaps between mould and sidewall are the same, then pour the mixed backing layer refractory castable into the gaps, vibrate it by vibration bar till no bubble emerges (If mould is unavailable, cast working layer first and then permanent backing layer). The bottom of permanent backing layer is 100 mm in height; vibrate 300-400 mm per time, and its 90-100 mm in thickness, then one circle by one circle till to the top.

    After vibration of permanent backing layer, lift the refractory ladle to an area at higher temperature, so that it is convenient for water evaporation and drying of cast body. The time of demould should be more than 12 hours, usually 24 hours, specific time depends on lining harden situation.