Novel recycling process of ferro-alloy using steelmaking slag

2016 Fiscal Year Final Research Report

• Project/Area Number: 26289278
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Metal making/Resorce production engineering
• Research Institution: Tohoku University
• Principal Investigator: KITAMURA SHINYA 東北大学, 多元物質科学研究所, 教授 (80400422)
• Co-Investigator(Kenkyū-buntansha): 金 宣中 東北大学, 多元物質科学研究所, 助教 (40724430) ; 高 旭 東北大学, 多元物質科学研究所, 教育研究支援者 (80707670)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Keywords: 製鋼スラグ / マンガン / リン / 硫化 / 浸出

Outline of Final Research Achievements

Ferro alloy can be produced by steelmaking slag using carbothermic reduction as it contains Mn and Cr. However, as P is also reduced, its value is low. The purpose of this research is the development of recovery process of Mn and Cr as ferro alloy by the separation of P from them. The elemental technologies are (1) separation of Mn and P by sulfurization, (2) selective leaching of P-rich water soluble phase in slag. For the technology (1), by the fundamental test and reaction model, multi-sulfurization process was proposed. However, the Mn yield was only 45% and ratio of Mn to Fe was 0.46. For the technology (2), by the leaching of oxidized slag after slow cooling using citric acid, without the dissolution of matrix, 99% of P was recovered selectively.

Free Research Field

金属資源生産工学