Material for phosphate fertilizer and method for production thereof
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United States of America Patent
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Issued Date -
Aug 26, 2004
app pub date -
Apr 5, 2004
filing date -
May 17, 2001
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Provided is a raw material for phosphate fertilizer having excellent fertilizer characteristics, which raw material consists essentially of a slag containing phosphate generated from dephosphorization reaction in molten iron, and is a method for manufacturing the raw material suitable for manufacturing the phosphate fertilizer. The raw material for phosphate fertilizer consists essentially of a slag containing phosphate generated from dephosphorization reaction in molten iron. As for the slag composition, the phosphate content satisfies the formula (1), and preferably the formula (2): [P.sub.2O.sub.5].gtoreq.5.6.times.[F]+7 (1) [P.sub.2O.sub.5].gtoreq.5.6.times.[F]+10 (2) where, [P.sub.2O.sub.5] is the phosphate content in slag, (mass %) and [F] is the fluorine content in slag, (mass %). The method for manufacturing the raw material thereof is a method of charging an oxygen source and a CaO source to a molten iron which decreases the Si concentration therein to a sufficient level, thus inducing the dephosphorization reaction in the molten iron, or a method of charging a CaO source and a gas oxygen in respective specified configurations and conditions to the molten iron, thus inducing the dephosphorization reaction in the molten iron.
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