The invention relates to a
slag line
brick for a steel
ladle and a preparation method. The
slag line
brick for the steel
ladle is prepared from, by weight, 10-40 parts of fused
magnesite with the particle size greater than or equal to 3 mm but smaller than 5 mm, 5-30 parts of fused
magnesite with the particle size greater than or equal to 1 mm but smaller than 3 mm, 10-20 parts of fused
magnesite with the particle size smaller than 1 mm, 5-20 parts of magnesite-carbon waste
brick fine powder, 12-16 parts of flaky
graphite, 1-3 parts of bonding agent and 4 parts or less of additive. The
slag line brick has the advantages that the problem that an existing slag line brick frequently produces a steamed bun shape in the using process is solved, the slag line brick for the steel
ladle adopts phenolic resin having better wettability and
moisture retention property, the pug temperature is strictly controlled, the phenomenon that mixed pug is dried too fast due to too high temperature is avoided, the adding amount of
metal or
alloy powder is appropriately controlled by increasing critical particle size, the
graphite adding amount is increased, a
heat stress is buffered by introducing a trace amount of additive, and the
thermal shock resistance stability of the slag line brick is improved.