Patent ID: 7011689

Claim:
A process for producing fused alumina-zirconia grits comprising the steps of: a) mixing raw materials to produce grits with the following chemical composition, in % by weight: ZrO 2 + HfO 2 : 10–60% Al 2 O 3 : 38–90% SiO 2 : <0.8% Impurities: <1.2% b) adding carbon and aluminum metal to the mixture of raw materials to obtain a charged batch containing, in % by weight,: Carbon: 0.4–1% Aluminum metal: 0.5–2.5% c) melting said charged batch in an electric arc furnace with a voltage of 175–205 V and a delivered specific electrical energy of 2.5 to 4 kWh per kg of charge.