A New All-round Hot Patching Technology for Converter Linings with Twice The Result with Half The Effort

    Traditionally, carbon-based hot patching materials for converters generally contain more than 10% asphalt/resin. During the application, construction workers manually throw the materials into the positions in the converter that need to be repaired. Under the action of high temperature, organic substances such as asphalt soften and liquefy, endowing the materials with good adhesiveness and certain fluidity. This enables the patching materials to adhere and level off at the positions that need to be repaired and form a firm carbon bond, thus achieving the purpose of repairing the converter lining.

    This construction method mainly relies on manual throwing, which has high labor intensity, low work efficiency, and a harsh working environment. Moreover, the throwing distance is short, the patching position is inaccurate, and there is serious material waste.

In order to solve the above problems, Innovake used a patching machine instead of manual labor at the converter maintenance site, achieving excellent results. This technology has the following main features:

    Firstly, the frame of the patching machine is equipped with upper and lower conveyor belts, which are connected to the driving device inside the frame. There is a gap between the two conveyor belts. The patching machine uses the relative movement of the upper and lower conveyor belts to catapult the patching material bags between the two conveyor belts into the converter hearth.

Secondly, traveling wheels are installed at the bottom of the patching machine frame, and a push handle is installed on the frame. There is a support rod connecting the push handle and the traveling wheels, which facilitates the rapid turning and movement of the equipment on site.

    Thirdly, by installing traveling wheels, a push handle, and a support rod, it is convenient for workers to control the throwing direction of the patching material bags, ensuring the accuracy of throwing.

Fourthly, a fireproof cover is installed on the outer side in front of the equipment, which can effectively isolate the heat source. A protective cover is installed on the outer side of the side, which can prevent the material bags from falling out from the side or causing other dangers.

Fifthly, the structure and operation mode of the equipment are relatively simple, making it convenient for on-site personnel to operate and maintain.

    Sixthly, the packaging requirements for the patching material bags are comparable to those for manual throwing. They are packaged in a certain amount of bags using ordinary woven bags, and the weight should be controlled at 3 kilograms (with a positive and negative deviation of less than 0.1 kilograms).

During patching, workers put the patching materials into the receiving port of the patching machine bag by bag. Then, the patching materials can be shot into the converter through the acceleration of the conveyor belt. In this way, the patching of the large surface, small surface, trunnion area, and molten pool part of the converter can be easily and quickly completed.

    Field industrial application practice shows that the new hot patching technology has a faster patching speed, precise control of the patching direction, good stability of fixed-point patching, more uniform feeding, and easy sintering. It can also perform excellent patching on difficult-to-repair parts such as the trunnion, molten pool, and slag line. This technology can effectively improve the repair efficiency of the patching materials used for converter maintenance, reduce the labor intensity in front of the furnace, and avoid material waste.