Magnesium Calcium Tundish Dry Vibrating Material

Dry vibrating material is an amorphous refractory material formed by vibration without adding water or liquid binder. Under the action of vibration, the material can form a dense and uniform whole, and when heated, it is strengthened by thermosetting binder or ceramic sintering agent. Dry vibrating material is composed of refractory aggregate, powder, binder, sintering agent and additives. Characteristics of dry vibrating material: This material is easy to flow under the action of vibration force, and the powder can fill the extremely small pores between the particle accumulation even under the action of very small vibration force to obtain a dense body with a high filling density. During use, a layer of working surface with a certain strength is formed by heating. The non-working surface still has some unsintered original dense accumulation structure. This structure helps to reduce the stress caused by expansion or contraction; helps to hinder the diffusion and extension of cracks; helps to prevent the invasion of metal melt, and is easy to dismantle and clean the furnace. This material is constructed on site by vibration method. The construction is simple, the construction period is short, and no maintenance and baking are required. The working layer can be directly and quickly heated to sinter and put into use.

 

Dry vibration materials are divided into acidic vibration materials (silica sand or silica, zircon), neutral vibration materials (corundum, mullite), alkaline vibration materials (magnesium, magnesium aluminum), carbon-containing and silicon carbide vibration materials (corundum-silicon carbide-carbon, alumina-carbon, magnesium oxide-carbon, magnesium oxide-calcium oxide-carbon, etc.).

Reasonable particle grading is the determining factor for improving the density of dry vibration materials and reducing the segregation of coarse particles. On the basis of coarse, medium and fine particle grading, reducing coarse particles and increasing the amount of fine powder can effectively reduce particle segregation. However, excessive fine powder content less than 10μm will lead to increased particle segregation and increase porosity. To obtain a dense structure with higher filling density and less particle segregation, it is advisable to appropriately increase the proportion of medium particles. The particle grading used for general dry vibration materials is: coarse: medium: fine. Increasing the bulk density of dry vibration materials can effectively improve their corrosion resistance and thermal conductivity.

The fluidity of dry vibration materials during vibration molding varies with particle grading, particle shape and vibration conditions. Particles without edges (smooth) are easier to flow than particles with edges.

The type and amount of thermosetting binder and ceramic sintering agent are key factors in determining the temperature at which dry vibration materials start sintering and the sintering strength they produce. The selected sintering agent must start sintering at the specified temperature and have suitable use strength. It must not reduce the refractory properties of the material, produce no harmful gases and harmful substances, and will not pollute the environment. The sintered body must not have serious cracking, expansion, and contraction. Thermosetting phenolic resins, silicates, sulfates, borates, phosphates, etc. can be used as thermosetting binders and ceramic sintering agents. Reasonable selection should be made according to different use parts and different use requirements.

Dry vibrating materials can be constructed on site by direct vibration and indirect vibration to obtain a uniform and dense overall structure. The direct vibration method is to vibrate the refractory material directly with a vibrator, fully compact a layer of refractory material with the vibrator, rake its surface, fill a new layer of material, and then fully compact it with the vibrator. This is done layer by layer until the construction is completed. Avoid stratification between layers during construction. Indirect vibration is the vibration force generated by the vibrator fixed on the inner or outer mold is transmitted to the vibrating material through the template, thereby densifying it.

The filling density of dry vibrating materials after molding is closely related to the degree of preloading, the vibration force of the vibrator, the vibration frequency and the number of vibrators. Preloading can increase the initial filling density. Increasing the vibration frequency can also increase the filling density. When the vibration frequency is above 50Hz, increasing the vibration force can effectively increase the filling density of the construction body. When the dry vibrating material is not preloaded, the vibration force generated by two mutually perpendicular vibrators can also achieve a fully dense effect.

In a cored induction furnace, the furnace body generally uses neutral dry vibrating materials. The material of the dry vibrating material used in the sensor can be changed according to the use conditions. Acidic or neutral dry vibrating materials are often used in non-ferrous metal smelting furnaces. Alkaline or neutral dry vibrating materials are often used in steel smelting furnaces. Due to the characteristics of easy construction and fast baking, dry vibrating materials are used in the metallurgical industry and can save 30% energy compared with refractory castables. Using dry vibrating materials in continuous casting tundishes can reduce material costs by 20% compared with using insulation boards.

The tundish magnesium-calcium dry vibrating material is dry-formed, and the construction is quick. The surface is flat and smooth after construction, which can effectively reduce the pollution of the tundish working layer material to the molten steel. No water is added during the construction process of this product, which can greatly shorten the time required for the tundish baking, thereby reducing fuel consumption. The service life of magnesium dry material is greater than 24 hours, and the service life of magnesium-calcium dry material is greater than 12 hours. Environmentally friendly magnesium dry vibrating material is characterized by strong resistance to slag erosion, no irritating gas is produced during baking, which is beneficial to the environment. During use, the molten steel does not increase carbon or hydrogen, and can clean the molten steel. This material has been used in many steel mills with remarkable results.

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