| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the elution amount of fluorine when recycling fluorine-containing blast furnace slag. <P>SOLUTION: Recycled slag is recycled slag produced from blast furnace slag consisting of 30-45 mass% of CaO, 25-40 mass% of SiO<SB POS="POST">2</SB>, 10-16 mass% of Al<SB POS="POST">2</SB>O<SB POS="POST">3</SB>, ≤10 mass% of MgO, 0.3-1.5 mass% of S and the balance inevitable impurities, wherein when the concentration (mass%) of alkali metal oxides is represented by R<SB POS="POST">2</SB>O and the amount (vol.%) of a melilite mineral phase by M, the concentration R<SB POS="POST">2</SB>O of alkali metal oxides and the amount M of a melilite mineral phase satisfy the expression: M-14×ln(R<SB POS="POST">2</SB>O)-98≥0. <P>COPYRIGHT: (C)2013,JPO&INPIT |
