Patent ID: 8025824
Filing Date: 2011-09-27
Classification: B09B,C04B,Y02P

Abstract:
1. A process for producing refractory particles, which comprises introducing to and melting in a melting furnace both a spent refractory which contains, by mass % as chemical components, from 75 to 97% of at least one of ZrO 2 and Al 2 O 3 , from 2 to 25% of SiO 2 , from 0.4 to 7% in total of Na 2 O, K 2 O and Li 2 O, at most 2% of CaO and at most 2% of MgO, wherein mass % is based on the total mass of the ZrO 2 , the Al 2 O 3 , the SiO 2 , the Na 2 O, the K 2 O, the Li 2 O, the CaO and the MgO, and carbon particles in an amount of from 1 to 8% by mass percentage, wherein mass percentage is based on the total mass of the spent refractory, and after the melting, tapping the melt while blowing compressed air against the melt to form refractory particles having the content of at least one of ZrO