Properties of dry vibratory materials

The main properties of dry vibratory materials are shown in Table 1. Sintered magnesia with MgO > 95% and fused magnesia with MgO > 97.2% were used as refractory aggregate and powder respectively in No. 1 and No. 2. The critical particle size was 5mm and graded according to three grades. The refractory powder is graded in 180 mesh and 320 mesh. Bone meal is better than 68:32. The sintering agents and modifiers are polyphosphate, boric acid and aluminum magnesium spinel. Phenolic resin powder was used as binder, the dosage was about 6%; No. 3 used magnesia as refractory aggregate and powder, modifier was super bauxite clinker powder and a-Al2O3, sintering agent was boric acid and soft clay. The dosage of modified phenolic resin powder is 5.6%, and 0.5% Urotropine is added as accelerator; the number 4 is the same as the number 3, and the refractory aggregate and powder are mixed with about 18% sintered spinel; the number 5 uses MgO > 42% and CaO > 55% sintered magnesia-calcium sand as refractory aggregate, MgO > 95% sintered magnesia as refractory, sintering agent and modification. Sex agent, using about 6% resin powder as binder. In short, the material composition of dry vibratory material varies greatly from each other and should be determined according to the conditions of use. The tundish dry vibrating material is being popularized. Its service life varies with the size of the tundish, the type of steels smelted and the operating conditions, etc. It is usually 10-77 hours. Magnesium-calcium dry vibrating material should be popularized because of its advantages of clean molten steel and strong corrosion resistance. The key technology of dry vibrating material is to choose binder and sintering agent to ensure the strength at various temperatures. The dosage is determined according to the composition and use requirements of the material.