Separation and recovery of phosphorus from steelmaking slags with the aid of strong magnetic field

Kazuyo Yokoyama, Hironari Kubo, Kazuhiro Mori, Hidehiko Okada, Shuji Takeuchi, Tetsuya Nagasaka

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

In order to make sure the great potential of steelmaking slag as a new phosphorus resource, domestic phosphorus material flow in Japan including iron and steel industry has been investigated based on the statistical data on 2002. It has been demonstrated that phosphorus in the steelmaking slag is almost equivalent with that in the imported phosphate rock in the view points of the amount and the concentration. Phosphorus exists mainly in the form of calcium-phosphate or its solid solution with calcium-silicate rather than the FetO rich liquid phase in the slag and exhibits remarkable segregation in the solidified slag. If the strong magnetic field is applied to the crushed slag, precipitated calcium-phosphate solution phase can be separated from Fet0 matrix phase due to the large difference of each magnetic property. It has also been indicated by the Waste Input-Output model that the phosphorus recovery from steelmaking slag by the new process proposed in the present work has great environmental and economical benefits.

Original languageEnglish
Pages (from-to)683-689
Number of pages7
JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
Volume92
Issue number11
DOIs
Publication statusPublished - 2006 Nov

Keywords

  • Calcium phosphate
  • Dephosphorization
  • Fertilizer
  • Input-output analysis
  • Material flow analysis
  • Phosphorus resource
  • Steelmaking slag

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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