The service life ofelectric furnace lining can be increased by selecting suitable gunning materials. The electric furnace gunning material can effectively delay the damage time of the furnace lining, increase the service life of the furnace lining, reduce the cost of large and medium repairs, and at the same time ensure the continuous production of the electric furnace, thereby improving the production efficiency of the electric furnace, and the gunning process is simple and easy to use. Convenience, short production cycle, energy saving and strong adaptability.

Physical And Chemical Indicators

Selection of electric furnace gunning material:

1. Raw material selection. At present, the aggregates of electric furnace gunning materials mainly use magnesia, magnesia dolomite, magnesia-chromite, magnesia carbon, and magnesia dolomite carbonaceous raw materials. At the same time, add appropriate additives to the material, such as adding Si, For low melting point metal powders such as Al and Mg, the metal powder oxidizes to increase the temperature during gunning, and forms harmless oxides in the gunning material, which is beneficial to improve the adhesion of the gunning material; adding spinel , Cr203, SiC, B4C, Si3N4, etc. to improve the oxidation resistance and corrosion resistance of materials; the addition of organic explosion-proof fibers is conducive to the discharge of moisture in the binder and can prevent the castable from bursting during use; adding metal fibers for Tap the tap hole to improve the spalling resistance of the gunning material; adding a small amount of metallurgical slag can improve the adhesion and corrosion resistance of the gunning material.

2. Use appropriate additives. The binding agent is pided into two types: organic binding agent and inorganic binding agent. Organic binders mostly use thermosetting resins and water-soluble phenolic resins; inorganic binders include CaO and MgO and their hydration products, as well as phosphates, water glass, amides, and sulfates. In actual use, the method of combining organic binders with inorganic binders or the method of combining several inorganic binders is often used, especially the phosphate binders are used, and the magnesium gunning material is added with an appropriate amount of hardening accelerators and plasticizers. It is better to use more in electric furnaces.

3. Optimize particle gradation. Large particles, high resilience rate, poor fluidity, but good corrosion resistance; small particles, although the resilience rate can be reduced, but the gunning material has a high porosity, which is not conducive to the corrosion resistance of the material. Generally, the critical particle size of semi-dry gunning material is 3mm. The critical particle size of the flame gunning material is 1mm.