METHOD OF DECHROMIZING MOLTEN IRON AND METHOD OF MANUFACTURING PHOSPHATE FERTILIZER RAW MATERIAL
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United States of America Patent
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Jul 30, 2020
app pub date -
Oct 16, 2018
filing date -
Oct 20, 2017
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Abstract
On molten iron having the P concentration of 2 to 4 mass % and having the Cr concentration of 0.3 to 1.2 mass %, a dechromization treatment is performed by adjusting a basicity (CaO mass %)/(SiO2 mass %) of slag to greater than 0.1 and 1 or less and supplying an oxygen source with a molten iron temperature falling within a range of 1250 to 1500° C. to manufacture molten iron having the P concentration of 1.9 to 3.8 mass % and having the Cr concentration of less than 0.2 mass %.
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