Process for pyrometallurgical recovery of iron from iron...

Details Process for pyrometallurgical recovery of iron from iron... Process for pyrometallurgical recovery of iron from iron...

C - Chemistry, Metallurgy

21

B

53/38

C21B 3/06 (2006.01) C21B 3/04 (2006.01) C21B 11/00 (2006.01) C22B 7/04 (2006.01)

Patent

CA 1075469

ABSTRACT OF THE DISCLOSURE A process for recovering iron from preliminarily decopperized molten copper smelter slags having an initial composition which includes iron oxide, (FeO), silica (SiO2), and aluminum oxide (Al2O3) as the major constituents. These constituents are initially present in the range of 40-70 percent FeO, 25-40 percent SiO2 and 5-10 percent Al2O3. The slag is maintained in a molten state and a solid reductant is mixed into the slag using an internally cooled, metal bladed, rotating stirrer, which rotates at a rate sufficient to pump the reductant into the slag to enhance the reduction of the iron oxide. It is important to maintain the SiO2 to CaO ratio in the range of about 2.0-3.3. Thus, along with the reducing agent, other constituents are added to the molten slag to maintain the slag with the desired composition. After reduction of the slag, the iron-bearing phase is separated from the slag in the form of a metal-rich matte containing 85-90 percent iron.

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