Coil cement construction precautions

1. The induction coil of the medium frequency furnace to be smeared with coil mud must be cleaned off the floating ash and paint slag pasted on it, and cleaned with a wire brush. The top ring firebrick must be filled and tightened with hard objects, and the fastening screws of the furnace cover plate must be tightened. Induction ring fixed reinforcement of medium frequency furnace (very important).

2. The mixed water shall be of drinkable quality. The ideal water temperature is between 5-25 ° C. The amount of water added should be strictly controlled in the range of 15-22 liters /100 kg material specified in the instruction manual. Can be added in 16kg / 100kg material. Excessive addition of water will cause the strength to decrease, increase the solidification time and shrinkage and crack.

3. When the coil mud is mixed, all the equipment and tools are clean and must not be mixed on the bare ground. It can be mixed by hand in the field without a mixer, and should be mixed evenly. The mixed material should be constructed within 30 minutes after mixing (at 5-25 ° C in the environment).

4. When coating the coil of the intermediate frequency furnace, a plumb line should be hung in the center of the intermediate frequency furnace to check whether the installation position of the coil is concentric with the furnace.

5, if the furnace coil coating construction, pay attention to make the coating embedded in the coil turns, coating thickness is about 6mm. The surface should be smooth and flat. When the old furnace lining is removed by a push-out mechanism, the coating should be formed into an inverted cone smooth and flat inner surface with large top and small bottom. The bottom coating thickness can be 10-12mm.

6. Minimize the gap or protrusion size between the bottom/top turn of the IF furnace coil and the corresponding bottom/upper support structure of the IF furnace (such as the pouring port). The purpose is to make the coil coating layer and the bottom/upper support structure of the electric furnace to form an overall smooth cylinder, so that the furnace lining can be expanded or cooled on its smooth surface, to prevent the furnace lining expansion and the above protruding objects or gaps between the huge stress, resulting in the lining crack.

7. After the coating layer is completed, the surface of the coating layer is brushed with a wire brush to facilitate drying.

8. The repair layer of a new coil coating or a larger area of coil coating should be subjected to at least maximum natural drying. Small areas also require a natural drying period of at least 6 hours. After natural air drying, external heat source baking, baking temperature between 200-250℃. The infrared lamp can be used as a drying tool, and the crucible mold can be put into the furnace as a heating body, and the low power is used to heat it to evenly bake the coil coating layer. (The water of the furnace will not stop cooling.)

9. Coil mud should be completed at least 2 days before building new furnace lining.