The knotting materials are quartz sand knotting materials and magnesium knotting materials, and magnesium knotting materials have a long time to use, and are generally used in medium frequency furnaces with large tonnage. Quartz sand knotting material is used in small tonnage furnace, the number of uses is 30-40 times.

The dry knotting material is sintered at a lower temperature to quickly form a solid working layer. The knotting material can resist mechanical impact at the same time, but also prevent slag penetration, resist slag erosion, and optimize the dispersion and heat insulation of the electric furnace heat.

After the construction of the knotting material, in order to prevent the scrap steel from damaging the unsintered furnace bottom, the surface of the dry knotting material is tightly covered with 2 mm thick steel plate. Lightweight scrap Basket material, the height of the material should be < 1.5 m, open the basket as far as possible to avoid the mechanical impact on the bottom of the furnace, and it is strictly prohibited to use heavy material impact on the bottom of the furnace.

When the temperature of the electric furnace is about 800 ℃, the sintering time of the furnace bottom is 10 min. Continue to heat up to about 1000 ℃, sintering furnace bottom, furnace slope time in 20 minutes. The second basket is mainly filled with light scrap steel. When the temperature rises to about 1100 ℃, the sintering furnace bottom and slope time is 15 min. The heavy scrap material of the third basket material plant is the staff. When the heating process is 1600 ℃, the sintering furnace bottom and furnace slope can be smelted normally in 10 minutes.

Do not blow oxygen for primary and secondary materials, and do not use buried pipes to blow oxygen during smelting and melting. .. The furnace is only used for smelting. There is no special requirement for steel, and hot metal cannot be added.

After the electric furnace is used for a period of time, if the local pits are found in the furnace bed, it is necessary to immediately carry out hot repair, first remove the residual steel and residue with an oxygen blowing tube, and then transport the dry knotting material to the top of the pits, and determine the appropriate sintering time according to the amount of material used. When the furnace is replaced and the slag line brick is removed, cold repair can be carried out, the residual steel and residue of the furnace bottom and slope are cleaned, and the dry knotting material is re-laid.

The dry knotting material is divided into sintering layer and powder layer, and the sintering layer is divided into: the thickness of the corrosion layer is about 20 mm by the heat side of the furnace bottom. Heat from dry knotting material outward. Dry type knotting material used in electric furnace has excellent hot repair performance and long service life, so it is generally used in hot repair.