Patent ID: 9688561
Date: 2017-06-27
CPC Classifications: C03B,Y02P

Claim:
1. A method of making a mineral melt comprising providing a cyclone furnace which comprises an upper zone, a lower zone below the upper zone, a base zone below the lower zone, an exhaust gas outlet in the upper zone, and a mineral melt outlet in the base zone, injecting particulate fuel, particulate mineral material, and primary combustion gas which has an oxygen level of at least 25% by volume into the upper zone of the cyclone furnace so that particulate fuel undergoes pyrolysis in the upper zone to produce char, the particulate mineral material melts in the upper zone to form a mineral melt, the mineral melt collects in the base zone as a melt pool, and hot exhaust gases are formed in the upper zone, injecting secondary combustion gas which has an oxygen level of at least 25% by volume into the lower zone of the cyclone furnace such that char combusts in the lower zone and hot exhaust gases are formed in the lower zone, and separating the hot exhaust gases formed in the upper zone and the lower zone from the mineral melt so that hot exhaust gases pass through the exhaust gas outlet in the cyclone furnace.