US 12,473,605 B2
Method for producing low-carbon ferromanganese
Nobuhiko Oda, Tokyo (JP); Yusuke Fujii, Tokyo (JP); Shingo Sato, Tokyo (JP); Ryo Kawabata, Tokyo (JP); Naoki Kikuchi, Tokyo (JP); Toshio Shiota, Tokyo (JP); and Ippei Higuchi, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP); and JFE MINERAL & ALLOY COMPANY, LTD., Tokyo (JP)
Appl. No. 17/802,389
Filed by JFE STEEL CORPORATION, Tokyo (JP); and JFE MINERAL & ALLOY COMPANY, LTD., Tokyo (JP)
PCT Filed Feb. 16, 2021, PCT No. PCT/JP2021/005689
§ 371(c)(1), (2) Date Aug. 25, 2022,
PCT Pub. No. WO2021/177021, PCT Pub. Date Sep. 10, 2021.
Claims priority of application No. 2020-038790 (JP), filed on Mar. 6, 2020.
Prior Publication US 2023/0167518 A1, Jun. 1, 2023
Int. Cl. C21C 7/068 (2006.01); C21C 5/35 (2006.01); C21C 5/36 (2006.01); C22C 33/06 (2006.01); C22C 35/00 (2006.01)
CPC C21C 7/068 (2013.01) [C21C 5/35 (2013.01); C21C 5/36 (2013.01); C22C 33/06 (2013.01); C22C 35/005 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A method for producing low-carbon ferromanganese comprising blowing an oxidizing gas onto a bath face of high-carbon ferromanganese molten metal contained in a reaction vessel provided with a top-blowing lance and bottom-blowing tuyere, from the top-blowing lance for decarburization, wherein
a slag composition during the blowing is adjusted so that a value of (CaO+MgO)/(Al2O3+SiO2) on a mass basis in the slag composition is not less than 2.5 but not more than 5.0, and
an agitation gas is blown from the bottom-blowing tuyere to have an agitation power density of not less than 500 W/t.