Ramming material refers to unshaped refractory materials that are constructed by ramming (manual or mechanical) and hardened under heating above normal temperature. It is made by mixing refractory aggregates, powders, binders, admixtures with a certain gradation and adding water or other liquids. According to the material classification, there are high alumina, clay, magnesia, dolomite, zirconium and silicon carbide-carbon refractory ramming mass materials. It is used to fill the gap between the furnace cooling equipment and the masonry or the filling material for the masonry leveling layer. The ramming mix material has good chemical stability, erosion resistance, wear resistance, peeling resistance and thermal shock resistance. Widely used in metallurgy, building materials, non-ferrous metal smelting, chemical industry, machinery and other manufacturing industries.
Dry ramming mass material is a cost-effective dry vibrating material, which is composed of special grade bauxite clinker, corundum, spinel, magnesite, sintering agent, etc. It is suitable for smelting carbon steel, alloy steel, stainless steel and high manganese steel, with long service life and high cost performance. The electric furnace bottom dry ramming material is formulated based on the principle of close particle packing and using high-quality synthetic raw materials, additives and binders. It has the characteristics of strong resistance to molten steel penetration, corrosion resistance, easy sintering, high packing density and convenient construction. It is an ideal material for the bottom of electric furnaces. Rongsheng’s dry ramming mix materials have been used by many foundry companies with very good results, helping companies reduce costs and extend the service life of kilns.
Dry ramming mass materials do not add water or liquid binder, and can form a fine and uniform whole under the effect of vibration alone. Thermosetting binders or ceramic sintering agents develop strength when heated. The material is composed of high-iron and high-calcium magnesia and electrolytic magnesia as aggregates. Composed magnesia and fused magnesia are used as fine powder, and the critical particle size is 5~6mm. C2F (dicalcium ferrite) in the composition of magnesia is used as a sintering aid, without adding any binding agent, and is made of multi-stage ingredients. Through strong ramming construction, the density after construction is ensured, and it can be sintered into a solid whole at the appropriate temperature. Its service life is several times longer than the previous knotting and bricklaying methods. Under normal circumstances, the one-time service life of dry ramming mix materials can reach more than 300 furnaces. It can be extended to 500-600 furnaces through hot patching. Not only has the number of furnace shutdowns been reduced, but the consumption of refractory materials per ton of steel has also been significantly reduced.
Dry Ramming Mix Materials from RS Refractory Factory
The types of dry ramming mix materials include: acidic ramming materials (silica sand, silica, zircon), neutral ramming materials (corundum, mullite), alkaline ramming materials (magnesium, magnesium Aluminum) and ramming mass materials containing carbon and silicon carbide (corundum-silicon carbide-carbonaceous, alumina-carbonaceous, magnesium oxide-carbonaceous, magnesium oxide-calcium oxide-carbonaceous, etc.).
With appropriate expansion function, its expansion and contraction will neither cause excessive cracks to reduce the intrusion of molten steel and steel slag, nor will cracks caused by contraction cause partial floating, ensuring that the furnace can continue to operate. The larger natural bulk density and post-fired density can not only prevent uneven density caused by construction and sintering, but also have high resistance to penetration by molten steel and steel slag. It has strong corrosion resistance to molten steel and steel slag, low corrosion rate, uniform corrosion, and long service life. The hot surface of the furnace bottom has a strong affinity with the new furnace bottom ramming mix material, which can ensure the repair effect.
On cored induction furnaces, neutral dry ramming mix materials are generally used for the furnace body. The raw materials of dry ramming mass materials selected for the sensor vary with the operating conditions. In non-ferrous metal smelting furnaces, neutral dry ramming materials are often used. In ferrous metal smelting furnaces, alkaline or neutral dry ramming mass materials are often used.
Application Advantages of Dry Ramming Mass Materials
Dry material is the general term for dry vibrating material, and there are many called dry mixes. Because the construction method is mostly ramming, it is often called dry ramming mass material.
This dry material is constructed using vibration or pounding methods in a dry state. According to the material, it can be divided into corundum, silicon, silicon-aluminum, magnesia and magnesia-calcium.
Dry materials are mostly used in furnace linings such as induction furnaces, aluminum smelting furnaces, tundishes and steelmaking electric furnaces. During the construction of dry ramming materials, the ramming mix materials are placed into the space between the mold and the permanent layer or the furnace shell, and are vibrated, tamped, and then baked before use.
The working principle of dry ramming mass material is: after the construction is completed or after heating and baking, the mold can be removed only when the hot surface has to form a certain combination and have a certain strength. Or there is no need to take off the mold and let the steel mold melt into the added molten iron or molten steel.
If it is during the smelting process, the working surface in contact with molten metal or slag will quickly develop sufficient strength, or form a dense sintered layer that resists the penetration of slag and metal. The loose, unsintered state remains behind the sintered layer. As the eroded sintered layer of the furnace lining advances from the inner wall to the outer layer, the thickness of the scattered layer will gradually become thinner.
The role of the unsintered loose layer has three aspects. First of all, after a furnace service is completed, the loose layer is still in an unknotted state, and it is very easy to fall off when the furnace is turned over. Second, it has the function of thermal insulation, reducing heat dissipation in the furnace lining and reducing the sintering of the loose layer. The third function is to prevent metal penetration.
Dry ramming mass materials have the functions of heat insulation, wear resistance and anti-penetration at the same time, which are two contradictory points. The heat insulation requires a small packing density, and the anti-penetration requires a high density. Therefore, the production process should determine the proportion of dry ramming materials according to the actual situation. In addition, attention should be paid to the selection of binders and burning aids and the impact of particle size on the ramming mix material.
Choose Rongsheng unshaped refractory material manufacturer to buy high-quality ramming mass materials, dry ramming mix materials, high-alumina mullite dry ramming materials, vibrating materials and other unshaped refractory castable materials, as well as plastic and other refractory furnace lining materials. Contact us for a free quote and solution.
