BigPatents India

The invention relates to a method for calcination of a material in which said material is heated by contact with a heat source essentially generated by means of a flame produced with at least one flow (a) of fuel and primary air and a flow (b) of secondary air, the flame comprising a first (I) combustion zone with a temperature below 1500 °C and a second (II) combustion zone with a temperature above 1500 °C, where at least one flow (c) of at least one inert gas is injected into the flame at the beginning of the second (II) combustion zone and/or at least one flow (d) of oxygen or a gas enriched in oxygen is injected into the second (II) combustion zone. No. of Pages : 21 No. of Claims : 16