Title:
製鋼スラグの資源化方法及び燐酸肥料用原料
Document Type and Number:
Japanese Patent JP5573403
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To inexpensively recover metal iron from decarburization refining slag and preliminary dephosphorized slag which are produced in a steelmaking process and utilize the steelmaking slag as a civil engineering and construction material or an environmental improvement material, which do not cause volume expansion and clouding phenomenon of seawater, and further as raw materials for phosphate fertilizers.SOLUTION: In the method for resource recovery from steelmaking slag, decarburization refining slag produced in decarburization refining of molten iron in a converter and preliminary dephosphorized slag produced in preliminary dephosphorization treatment of molten iron are mixed such that a basicity (mass% of CaO/mass% of SiO) of the mixture after the mixing of the slag is 1.5-2.8, reduction treatment for the reduction of an iron oxide in the slag is subjected to the mixture using a reducing agent containing one or more selected from carbon, silicon and aluminum, and the slag after the reduction treatment is used as one or more of a civil engineering and construction material, an environmental improvement material and raw materials for phosphate fertilizers, while metal iron obtained through the reduction treatment is used as an iron source.
Inventors:
Matsui 章敏
Naoki Kikuchi
Yasuo Kishimoto
Hiroyuki Tobo
Katsunori Takahashi
Yasuto Miyata
Yasuko Yao
Naoki Kikuchi
Yasuo Kishimoto
Hiroyuki Tobo
Katsunori Takahashi
Yasuto Miyata
Yasuko Yao
Application Number:
JP2010141137A
Publication Date:
August 20, 2014
Filing Date:
June 22, 2010
Export Citation:
Assignee:
JFE Steel Corporation
International Classes:
C21C5/28; B09B3/00; C04B5/00; C21B13/08; C21C1/02; F27D15/00
Attorney, Agent or Firm:
Shigeru Inoue
Woods Kazuhiro
Woods Kazuhiro