Recycling of iron values

Details Recycling of iron values Recycling of iron values

C - Chemistry, Metallurgy

21

B

53/22

C21B 3/02 (2006.01)

Patent

CA 1098711

ABSTRACT A method for recycling iron values such as the iron which is present in the iron oxide, primarily Fe3O4 found in millscale and other fine or waste materials containing oxides of iron. The method is applicable to basic oxygen refining operations wherein iron is charged to the basic oxygen furnace along with a flux. The method can also be applied to other iron or steel-making furnaces. In accordance with the inven- tion, a portion of the flux charged to the furnace is prepared by forming a mixture of iron or iron containing particles with the balance comprising dolomite, the mixture including suffi- cient iron values such that the product after calcination will contain in excess of 20 percent and up to 50 percent by weight iron values, calculated as Fe2O3. The mixture is heated in a kiln to a temperature in excess of 2000°F. whereby reaction products such as calcium and magnesium ferrites are formed and make up a substantial portion of the mixture. The mixture is then introduced as a part of the flux utilized in the furnace, the mixture preferably comprising from 20 to 100 percent of the dolomitic lime which would normally be utilized in said flux charge.

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