公开(公告)号：WO2022223061A1

公开(公告)日：2022-10-27

申请号：PCT/CZ2021/000044

申请日：2021-09-16

Applicant: VYSOKÁ ŠKOLA BÁŇSKÁ - TECHNICKÁ UNIVERZITA OSTRAVA

Inventor： VLČEK, Jozef ,  MATĚJKA, Vlastimil ,  FONIOK, Kryštof ,  MAIEROVÁ, Petra

IPC: C22B7/04 ,  B09B3/30 ,  B09B3/40 ,  B03C1/00 ,  B02C19/18

Abstract: Method for obtaining iron concentrate from metallurgical slags from steel production, containing at least 10 mass % of Fe, consists in their gradual crushing and grinding to a granulate with the particles of maximum grain size 1.0 mm, and a subsequent magnetic separation of the magnetic fraction contained in the granulate, while prior to commencing the magnetic separation, the granulate is mixed with water in the ratio of 1 mass portion of granulate to 10 to 100 mass portions of water to obtain a well mixable slurry which, after mixing and under continuous stirring, is subjected to magnetic separation for 2 to 30 min. with a co-action of ultrasound with a frequency of 20 to 40 kHz. Separated magnetic fraction is dried to a constant mass, and an iron concentrate with a content of 20 to 80 mass % of Fe is obtained. Alternatively, prior to mixing with water, the granulate may be subjected to calcination at a temperature of 600 to 1000 °C for at least 60 min. In order to increase the efficiency of this method, the residual fraction not captured by magnetic separation may also be subjected to calcination under the same conditions, and after mixing with water, either alone or in a mixture with the new granulate, the resulting slurry is subjected to repeated magnetic separation with the co-action of ultrasound.