The invention relates to a new technology for sorting a lean red
magnetite ore containing
iron carbonate, which is characterized by comprising the following steps of: enriching and discarding
tailings by adopting a 'technology for stage
grinding and strong magnetic discarding
tailings', thereby obtaining a mixed magnetic concentrate; sorting the mixed magnetic concentrate by adopting an 'open-circuit
reverse flotation technology with one-stage roughing, one-stage fining and two-stage
scavenging', thereby obtaining a high-grade
hematite and
magnetite concentrate; adopting a 'close-circuit
centrifuge technology with one-stage roughing and one-stage fining' for sorting a high
iron carbonate ore enriched in mine obtained by adopting the 'open-circuit
reverse flotation technology', thereby obtaining a
siderite concentrate; feeding the
centrifuge tailings into a weak magnetic
machine and sorting; and recycling fine fraction magnetic concentrates. The new technology provided by the inventionhas the advantages that the lean
hematite and
magnetite ore containing
iron carbonate is sorted by adopting a 'combined sorting process flow with stage
grinding, strong magnetic discarding tailings,
reverse flotation-
centrifuge', so that the sorting indexes of the whole iron grade of the obtained comprehensive concentrate being more than 65% and the
metal recovery rate being more than 65% are achieved and the maximization of utilization benefit of
iron ore resources is realized.