Composition and function of neutral ramming mass

The ramming material is made of composite technology and is an amorphous refractory material sintered under the action of heating (higher than normal temperature). A good ramming material can greatly extend the number of intermediate frequency furnaces, reduce working strength and improve production. Efficiency. At the same time, the ramming material is also called the knotting material, which is mainly used as the filler of the furnace body, that is, the filler to fill the gap between the cooling equipment of the furnace body and the masonry leveling layer, so as to isolate the contact between the molten metal and the intermediate frequency furnace.

Neutral ramming material is composed of fused corundum, brown corundum, graphite powder, alumina powder, metal silicon powder, binder and dispersant.

At high temperature, the silicon powder in the neutral ramming material and the fibrous silicon carbide generated in situ from the carbon material are inserted into the voids of the corundum skeleton structure, filling the voids and blocking the main channel of slag penetration, which is beneficial to improve the resistance to slag erosion. The addition of graphite micropowder increases the content of non-oxides in the material matrix, which is beneficial to further improve the corrosion resistance of the material; the silicon oxide generated after the high temperature oxidation of the generated silicon carbide reacts with the calcium oxide in the slag and the alumina in the material matrix The formation of low-melting calcium sulfide causes the material to gradually erode; slag and anorthite will also penetrate inward from the erosion layer, but they will encounter more and more silicon carbide barriers. Corundum particles in the erosion layer and slag The calcium oxide reacts to form an aluminum-silicon calcified body with a melting point of 1830 degrees Celsius, which is fixed on the surface of the corundum particles and no longer penetrates into the material, which enhances the structural stability and improves the resistance to slag corrosion. Construction quality and efficiency.

In summary, the neutral ramming material can improve the resistance to slag erosion, molten iron erosion, iron flux, strong chemical erosion resistance, good thermal shock stability, and can prolong the service life of the electric furnace.