Ramming Mass
It is constructed by a beating method and is shaped with an amorphous refractory material that is hardened by heating under normal temperature conditions. And has a certain grade of refractory aggregate. It is composed of refractory aggregate, powder, binder and admixture with certain concentration, and water or other liquid is mixed. According to the material, it is classified into high alumina, clay, magnesia, dolomite and zirconium.
The ramming material can be configured from refractory aggregates and powders of various materials according to the needs of use. At the same time, according to the refractory aggregate material and the use requirements, a suitable binder is selected. Some ramming materials do not use a binder and only a small amount of a solvent is added to promote sintering. Sodium silicate, silicate ethanol and silica gel are commonly used as binders in acidic ramming materials. It is also often used in places with high carbon content to form carbon-bound organics and temporary binders at high temperatures. Chrome ramming is commonly used as a binder for thenardite. High-aluminum and corundum ramming materials are commonly used as binders for inorganic substances such as phosphates and chlorides of phosphoric acid and aluminum. When phosphoric acid is used as the binder, the phosphoric acid reacts with the activated alumina in the ramming material during storage to form a precipitate of aluminum orthophosphate which is not used for coagulation and hardening. It is difficult to construct due to loss of plasticity. Therefore, in order to extend the shelf life of the ramming material, an appropriate preservative must be added to prevent or delay the occurrence of coagulation hardening, and oxalic acid is usually used as a preservative.
Ramming Mass Performance
Generally, the ramming mass is mainly used for the direct contact with the molten material, and the refractory material is required to have good volume stability, compactness and corrosion resistance, so that high-temperature firing or electrofusion raw materials are generally selected. The maximum particle size of the ramming material is related to the construction method of the used part, and the general critical particle is 8 mm. Most of the ramming materials have low room temperature strength before unsintering, and some of the squeegees are not too high in medium temperature. Only when the smashing is heated, the good combination is obtained. The fire resistance and erosion resistance of the ramming material can be obtained through high quality raw material selection, reasonable ratio adjustment and careful construction. In addition to high stability and erosion resistance at high temperatures. The service life is also largely determined by the quality of the sintering before use or the first use. If the heating surface is sintered as a whole, no cracks and no separation from the lower layer, the service life can be improved.
Ramming Mass Used in Glass Furnace
1. Zircon sand ramming material, its composition is % (mass): Zro2 62, sio232, Al2o3, fe2o3 0.5, bulk density is more than 3g/cm3, refractoriness is above 1790 °C, maximum particle is 0.5mm. The binder is made of orthophosphoric acid and aluminum hydroxide, and the aluminum dihydrogen phosphate is firmly bonded, has high strength and high temperature resistance, but is easy to be air-dried and hard, and is not easy to be placed for a long time, and has certain corrosiveness and inconvenience to the skin.
2. Zirconium corundum ramming material, commonly used AZS brick waste as refractory material. The composition of the ramming material is (%): Al2o3 48, Zro2 30, Sio2 20, the crystal phase is α-Al2o3, mullite, oblique zircon, glass phase, and the largest particle is 5 mm. When used, it needs to be stirred with water, the bulk density is 3.2g/cm3, the porosity is 12%, the tendency of precipitation bubbles is weak, and the resistance to glass liquid is strong at 1400 °C. It can also be used as a sealing layer and a mud slurry.
3. Low shrinkage AZSC ramming material It introduces a certain amount of chromium-containing material in the basic component of AZS, the bulk density is more than 2.9g/cm3, the shrinkage of reheating line is less than 0.2% (1400°C, 3h), and the corrosion resistance of glass liquid Better than two types of ramming. It is also possible to seal the layer and the castable.
