US 12,220,707 B2
Method and apparatus for processing magnetite
Andrew Graham Hamilton, East Perth (AU); and Gerald Michael Larosa, East Perth (AU)
Assigned to IB OPERATIONS PTY LTD, East Perth (AU)
Appl. No. 17/294,122
Filed by IB OPERATIONS PTY LTD, East Perth (AU)
PCT Filed Aug. 16, 2019, PCT No. PCT/AU2019/050865
§ 371(c)(1), (2) Date May 14, 2021,
PCT Pub. No. WO2020/097666, PCT Pub. Date May 22, 2020.
Claims priority of application No. 2018904331 (AU), filed on Nov. 14, 2018; and application No. 2019902398 (AU), filed on Jul. 5, 2019.
Prior Publication US 2022/0008932 A1, Jan. 13, 2022
Int. Cl. B02C 4/02 (2006.01); B02C 4/30 (2006.01); B02C 4/42 (2006.01); B02C 23/12 (2006.01); B02C 23/14 (2006.01); B03C 1/14 (2006.01); B03C 1/30 (2006.01); B07B 9/00 (2006.01)
CPC B02C 23/12 (2013.01) [B02C 4/02 (2013.01); B02C 4/30 (2013.01); B02C 4/42 (2013.01); B02C 23/14 (2013.01); B03C 1/14 (2013.01); B03C 1/30 (2013.01); B07B 9/00 (2013.01); B03C 2201/18 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A magnetite iron ore processing apparatus, comprising:
a first high pressure grinding roller (“HPGR”) configured to operate in a crushing mode for crushing the magnetite into coarse particles;
a second high pressure grinding roller (“HPGR”) configured to operate in a grinding mode for grinding the coarse particles into fine particles; and
a dry magnetic separation (“DMS”) unit for discarding non-magnetic materials from the crushed magnetite prior to grinding,
wherein each of the HPGRs has a separate feedback loop associated therewith for recycling particles through the respective HPGRs, with the dry magnetic separation unit being disposed outside the two feedback loops associated with the first and second HPGRs.