公开(公告)号：US20210054479A1

公开(公告)日：2021-02-25

申请号：US16977378

申请日：2019-02-22

Applicant: JFE STEEL CORPORATION

Inventor： Nobuhiko ODA ,  Yuta HINO ,  Yuki TAKAKI ,  Yoshiaki NISHINA ,  Naoki KIKUCHI

IPC: C22B9/14 ,  C22B47/00 ,  C21C7/00

Abstract: A manufacturing method includes a first pulverization step of compressively pulverizing a manganese oxide-containing material containing at least manganese, calcium, silicon, iron, and phosphorus, which is used as a raw material, to form a composite in which a compound phase of nCaO.P2O5 is combined with at least one phase of a spinel phase and a calcium ferrite phase, which are ferromagnetic materials, and produce a first pulverized manganese oxide-containing material containing the composite; a first magnetic separation step of separating the first pulverized manganese oxide-containing material produced in the pulverization step into a magnetic substance and a non-magnetic substance under a magnetic force; and a step of recovering the non-magnetic substance separated in the first magnetic separation step as a manganese raw material.