This semi-dry gunning machine is specially designed for cold repair and online hot emergency repair of refractory linings for electric arc furnace walls, furnace bottoms, furnace roofs, tapping holes, ladles and LF refining furnaces. Adopting the semi-dry process (dry powder mixed with water for spraying), it serves as the core equipment for daily maintenance of electric furnaces in steel plants.
Rapid repair of damaged refractory linings
During high-temperature smelting, the refractory lining suffers erosion, spalling, cracking and cavity defects. This machine quickly sprays refractory gunning mix to fill damaged areas, restore the integrity of the lining and prevent breakout caused by molten steel.
Uniform semi-dry mixing for firm coating adhesion
Equipped with an integrated water-material blending system, the machine mixes dry refractory powder with water at an accurate ratio before high-pressure spraying. The formed coating is dense with strong adhesion, low rebound and less peeling, greatly improving repair quality.
Online hot repair shortens furnace downtime
Hot gunning can be carried out under high-temperature conditions without full furnace cooling, which drastically cuts maintenance downtime, raises furnace operation rate and boosts steel output.
Extend the overall service life of electric furnaces
Timely repair of worn linings prevents large-area refractory damage, reduces the frequency of full furnace demolition and relining, and significantly prolongs furnace campaign life.
Lower refractory material consumption
Stable material output and low rebound rate greatly reduce material waste compared with manual plastering, cutting purchasing costs of refractory raw materials.
Suitable for full-area repair of electric furnaces
The machine is flexible to move with an angle-adjustable spray gun, enabling uniform spraying on complex positions including furnace walls, bottoms, slag lines, tapping holes and roofs for comprehensive furnace maintenance.
Reduce labor intensity and improve working environment
Mechanical spraying replaces manual plastering for easier operation. Closed conveying generates less dust, optimizing the harsh high-temperature, high-dust working environment at the furnace front.
Compatible with both cold and hot repair conditions
It supports cold repair (normal-temperature overhaul after furnace shutdown) and hot repair (online emergency hot mending), realizing dual-purpose functionality with outstanding cost-effectiveness.
