... of vibration to the hopper area: in the military and the chemical industry: ammonium sulfate, ammonium nitrate, ammonium ... black, activated carbon, coal, hydrated lime, pigments and additives. In the mechanical and metallurgical industry: sand casting, iron ore, sinter, ... , polishing materials, plaster, aluminum oxide powder. In the food and food industry: flour, soybean, peanut, starch, milk, salt, ...