| 摘要 |
<p>Binder building additive contains oxides of aluminum. magnesium, silicon, iron, calcium, sodium and potassium, aluminum nitride, metallic particles and minerals. Binder building additive contains (in wt.%) 50-90 alumina (Al2O3), 4-20 magnesium oxide (MgO), 0.5-15 silica (SiO2), 0.1-5 aluminum nitride (AlN), 0.1-5 iron (III) oxide (Fe2O3), 0.1-5 calcium oxide (CaO), 0.1-5 fluorine (F), 0.1-5 sodium oxide (Na2O), 0.1-2 potassium oxide (K2O), and as metallic particles 0.1-10 aluminum (Al), 0.1-3 silicon (Si), 0.1-3 iron (Fe), and mineral components in the form of corundum and spinel (MgO.Al2O3). The metallic aluminum particles are encapsulated by mineral transition modifications of aluminum hydroxide to alpha -aluminum oxide. The additive has a particle size of at least 90% less than 500 mu m and a BET surface area of at least 10 m<2>/g. An Independent claim is also included for a process for the production of a binder building additive. Preferred Features: The encapsulation of the mineral transition modifications has a permeability for gases and aqueous liquids. The additive has a particle size of at least 90% less than 200 mu m and a BET surface area of 10-50 m<2>/g.</p> |
