Converter Refractory Hot Repair Throwing Machine

I. Core Functions

(Summary: Online hot repairing under high temperature to protect lining, prolong furnace campaign and cut production cost)

1. Hot Repair of Furnace Lining

   Without shutdown at furnace temperature of 800–1200℃, the machine accurately feeds bagged refractory patching material (magnesite / magnesia-dolomite material) to damaged lining areas. Relying on residual furnace heat, the material spreads and sinters to repair severely worn sections including slag line, trunnion and molten pool. It balances uneven lining erosion and extends converter service life by 30%–50%.

2. Worker Replacement, Improved Safety & Working Efficiency

   Mechanical feeding replaces manual high-temperature operation within less than 1.5m from furnace mouth to eliminate scald hazards.

   Feeding capacity: 20–30 bags/hour (3kg per bag), 3–5 times higher efficiency than manual work and over 50% shorter patching duration.

   Precision targeted feeding boosts material utilization rate by 20% and cuts refractory waste.

3. Stable Repair Quality & Reduced Cost per Ton of Steel

   Uniform feeding enables dense sintering; patched layer tightly bonds with original lining with excellent anti-erosion performance to reduce repeated maintenance. It lowers refractory consumption and production loss from shutdown, cutting refractory cost per ton of steel by 5%–10%.

II. Typical Application Scenarios in Steelmaking Converter Workshop

1. Routine Online Hot Patching (Most Common Working Condition)

• Timing: After tapping and before next furnace charging, no furnace shutdown or temperature drop required.

• Target Positions: Heavily scoured slag line, stress-concentrated trunnion, big/small faces of molten pool and local pits on furnace bottom.

• Raw Material: Bagged hot patching material (asphalt/resin bonded magnesia refractory, 3kg/bag).

2. Emergency Repair for Severely Eroded Local Lining

• Working Condition: Local lining thinning, pits or cracks occur with no risk of steel leakage.

• Advantage: Quick hot repair without cold shutdown overhaul which normally takes 24–48 hours, avoiding production halt.

3. Surface Coating & Sintering for New or Overhauled Converter Lining

• Working Condition: During furnace drying period after new lining construction or intermediate overhaul. Even hot feeding forms compact protective layer on lining surface and improves overall erosion resistance.

4. Reinforced Maintenance for Special Positions

• Taphole surrounding: Combined application of throwing patching + local guniting to prevent taphole enlargement and prolong service life.

• Furnace cap & furnace mouth: Periodic hot patching against brick spalling and lining collapse caused by high-temperature flue gas erosion.