Patent ID: 7744848
Filing Date: 2010-06-29
Classification: C01G,C01P,F27B,F27D,Y02P

Abstract:
1. A process for producing high purity magnetite comprising the steps of: feeding hematite into a feed zone of a heating device for movement therethrough, the heating device further having a discharge zone, feeding gas into the heating device for movement therethrough, and heating a portion of the heating device to a maximum temperature in a range of about 700 to 1300° C., to convert said hematite into said high purity magnetite, and cooling the high purity magnetite in an atmosphere selected from the group consisting of a reducing gas atmosphere and an oxygen-free atmosphere, prior to the high purity magnetite being discharged from the heating device, wherein the high purity magnetite has a purity of greater than 90%, and wherein the feeding gas is natural gas.