Study on recovering iron concentrate from pyrite cinder with combined process of magnetic and gravity separation

The technical process of recovering iron concentrate from pyrite cinder was studied.The best technical process included magnetic separating at 120kA/m after classification and grinding,and gravity separation of magnetic tailings with helix screw-chute.The mixed iron concentrate contained 61.32% Fe with a recovery of 83.28% and a yield of 72.86%.High grade of concentrate can't be obtained without grinding.The grade of concentrate could be increased slightly if all pyrite cinder was ground,but the recovery would be down greatly.