Recovery of Fe and P from CaO-SiO 2-Fe tO-P 2O 5 slag by microwave treatment

Taeyoung Kim, Joonho Lee

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

In order to optimize the recovering process of Fe and P from steelmaking slag by the microwave irradiation, heating rates of various substances and recovery ratios of iron and phosphorus from slag-graphite mixtures were investigated. The heating rates of the examined substances are in the order of graphite Fe 3O 4 Fe 2O 3 > the synthesized CaO-SiO 2-Fe tO-P 2O 5 slag > the industrial slag. From the maximum heating rates, it was considered that the microwave absorption ability of graphite was 40 times greater than that of the industrial slag. Consequently, it was considered that the heating rate of the graphite-slag mixture was dominantly determined by graphite. In the reduction of the synthetic slag (15 g) by graphite (0.816 g), the weight of the recovered metal was maximized at 900 s under the present experimental condition (1.7 kW, 2.45 GHz). At a fixed microwave processing time of 900 s, the recovery ratio of iron increased with increasing the carbon equivalent (C eq.: the mole ratio of carbon to oxygen to reduce Fe 2O 3 and FeO, yielding CO gas), and reached 0.97 when C eq. = 1.69. The recovery ratio of phosphorus also increased with C eq., and showed 0.89 at the same condition. From the chemical analysis of the slag and metal after experiments, it was found that the phosphorus distribution ratio (L p) strongly depended on T. Fe content in slag, namely, as FeO content decreased, L p value decreased.

Original languageEnglish
Pages (from-to)2233-2238
Number of pages6
JournalMaterials Transactions
Volume52
Issue number12
DOIs
Publication statusPublished - 2011 Dec 1

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slags
Slags
Graphite
recovery
Microwaves
microwaves
Recovery
graphite
Heating rate
Phosphorus
phosphorus
heating
Carbon
Iron
Metals
iron
Microwave irradiation
microwave absorption
carbon
Steelmaking

Keywords

  • Microwave irradiation
  • Recovery iron and phosphorus
  • Steelmaking slag

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

Cite this

Recovery of Fe and P from CaO-SiO 2-Fe tO-P 2O 5 slag by microwave treatment. / Kim, Taeyoung; Lee, Joonho.

In: Materials Transactions, Vol. 52, No. 12, 01.12.2011, p. 2233-2238.

Research output: Contribution to journalArticle

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