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Phosphorous Removal from Steelmaking Slags for Re-use.

Authors
Iwasaki-I
Source
NTIS: PB 92-112960 :74 pages
Link
NIOSHTIC No.
10011233
Abstract
To recycle the iron, manganese, and lime in steelmaking slags, the removal of phosphorus is essential. Phosphorus is concentrated mainly in the dicalcium silicate phase in the slags. Previously, the slow cooling of a steelmaking slag in an air atmosphere was shown to cause the conversion of wustite to a strongly magnetic mg- mn-ferrite, and its close association with dicalcium silicate interfered with magnetic separation. The study aims at establishing the phosphorus mineralogy and its distribution in steelmaking slags by slow cooling under a neutral or somewhat reducing atmosphere and the methods of phosphorus removal. Magnetic separation produced iron-manganese-rich fractions analyzing 1.2 to 1.5 pct p2o5. Eighty percent of the phosphorus was associated with the locked dicalcium silicate, and a possibility of flotation upgrading is discussed.
Publication Date
19910101
Document Type
CP; Final Contract Report;
Fiscal Year
1991
NTIS Accession No.
PB92-112960
NTIS Price
A05
Identifying No.
OFR 43-91
Source Name
NTIS: PB 92-112960
State
MN;
Performing Organization
Univ. of Minnesota
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