Iron Runner · Slag Line
The main trough of a blast furnace cast house is the core channel for slag-iron separation and transport. The main trough slag line sits at the iron-slag interface, the most severely attacked zone of the trough. Its rapid loss determines trough throughput and repair frequency, and forms the main part of cast-house refractory cost.
Alternating slag/iron scouring: during casting, hot metal and slag alternately contact and churn violently at the slag-line interface, imposing strong scouring and chemical attack. Slag dissolution: CaO, FeO, MnO and other slag components react with and dissolve the castable matrix. Oxidation-structural spalling: carbon in carbon-composite castables oxidizes at high temperature, loosening the matrix and causing structural spalling. Thermal shock: the tap—no-tap cycle causes slag-line temperature fluctuation, accelerating cracking and spalling. Mechanical impact: iron landing points and slag flow impact the slag line.
Rapid slag-line loss lowers trough throughput and raises repair frequency, occupying cast-house time; in severe cases the slag line burns through, hot metal/slag spills out, endangering safety and forcing trough shutdown for major repair.
Recommend the Al₂O₃-SiC-C iron runner castable for the main trough slag line:
Monolithic casting: cast slag line and bottom in one pour, keeping construction joints away from the slag-line interface. Vibration: vibrate fully for tight bonding with the permanent layer. Bake-out: follow the curve to prevent carbon oxidation and residual moisture. Curing: control curing time and reach strength before service.
Plan repairs by throughput—record throughput each time and arrange hot repair or local replacement before the design value; inspect the slag line closely and restore thinned zones quickly with repair material or precast blocks; control iron dwell time and slag volume to ease the slag-line load.
Al2O3-SiC-C iron runner castable is made of high-grade bauxite clinker with SiC and carbon additives, offering excellent slag resistance, erosion resistance and thermal shock stability for blast furnace main troughs to achieve long service life.
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Iron runner castable purpose-built for blast furnace troughs with Al₂O₃≥65%, SiC+C≥15% and 1550℃ max service. Resists continuous erosion by hot iron and slag. For main trough working linings, branch runners, swing spouts, slag runners and trough covers—the core refractory of the cast house.
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SiC wear-resistant castable with SiC≥50% aggregate offers extreme hardness and erosion resistance to 1600℃. High thermal conductivity promotes slag-coating self-protection. For CFB boiler cyclone barrels and cones, loop seals, copper flash furnace cones, launders and elbows under heavy wear.
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