It is a very common method to improve the service life of electric furnace refractory lining by optimizing injection and repair material.Generally, the material of the aggregate in the injection supplement is the same as the material of the injection supplement furnace lining.With the development of metallurgical furnace lining quality, the material of injection supplement also develops from silicon, high aluminum, magnesium to high aluminum and silicon carbide, magnesium and dolomite, aluminum and magnesium, magnesium and carbon, aluminum, magnesium and carbon, magnesium, calcium and carbon.At home and abroad are committed to the development of new materials and new varieties, in order to meet the needs of different metallurgical furnace injection technology development.

In the smelting process, the injection supplement is under the same high temperature and harsh working environment as the furnace lining, so in addition to high fire resistance, erosion resistance, erosion resistance, peeling resistance, but also must have good attachment with the furnace lining.

The injection supplement for electric furnace includes magnesium, magnesia one dolomite, magnesia one chromite, one magnesium one carbon, magnesia one dolomite one carbon, etc., and some highly active seawater magnesia is used in the aggregate to promote sintering and improve the density and strength of the injection layer.In order to make the injection supplement quickly solidified during the injection operation, and attached to the furnace lining, a small amount of additives are often added to the aggregate.

① added Al, Mg and other low melting point metal powder spray stoppage time, the metal powder oxidative heat release helps to improve the temperature, and form harmless oxides in the spray supplement, improve the adhesion of the spray supplement layer and the furnace lining.

② added spinel Cr203, SiC, B4C and others to improve the oxidation resistance and corrosion resistance of materials.

③ adds a small amount of organic fibers ranging from 1~5mm long to form a ventilation duct at low temperature, which facilitates the evaporation of water in the binder agent and prevents bursting.

④ Add 0.1~2mm, 10-40mm long metal fiber, used for steel outlet and other parts, to improve the corrosion resistance of the spray fill layer.

⑤ adds some slag of metallurgical furnace to improve the attachment and corrosion resistance of spray supplement.