| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing slag containing a phosphorus-concentrated phase having a high P<SB>2</SB>O<SB>5</SB>concentration, by which phosphorus can be efficiently separated and recovered in the separation and recovery of useful components utilizing such a property that the phosphorus-concentrated phase is separated from the other phase in the cooling/solidification process of the slag; and to provide its production method. SOLUTION: In the slag containing the phosphorus-concentrated phase, the concentration of P<SB>2</SB>O<SB>5</SB>in the phosphorus-concentrated phase is≥20 mass% and the content of the phosphorus-concentrated phase is≥5 mass%. The method for producing the slag comprises using steel-making slag having a basicity within a range of 1.0-1.3 and setting the average cooling speed within a temperature range of 1,200-1,150°C to be≤5°C/min in the cooling/solidification process of the slag. COPYRIGHT: (C)2007,JPO&INPIT
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