Patent ID: 9068240
Filing Date: 2015-06-30
Classification: C22B,F23C,F23L,Y02E

Abstract:
1. A method for thermally processing α-spodumene by which treatment it is transformed into ρ-spodumene; wherein concentrate or ore with a grain size of 20-1,000 μm is processed in a fluidized bed reactor, at a temperature within a range of 800-1,000° C., by using an oxygenous gas as the fluidizing gas, wherein the temperature within the range 800-1,000° C. is chosen to limit formation of molten phases to less than 15% in the fluidized bed; and wherein such method outputs β-spodumene, discharged gas, and dust, followed by using the thermal energy of the discharged gas to preheat air to be fed into the fluidized bed reactor, wherein at least part of the dust is recovered by a cyclone and a fiber filter and returned to the fluidized bed reactor and wherein the dust obtained from a fluidized bed cooler is combined with the discharged gas.