| 摘要 |
PROBLEM TO BE SOLVED: To restrain inexpensively and securely the elution of fluorine from slag containing fluorine which is generated in the process using a converter to be 0.8 mg/L or less which is a reference value prescribed in Environment Agency notification No.46 in 1991. SOLUTION: By cooling slag generated in the process using a converter which has CaO/SiO<SB>2</SB>of≥1.5 and≤2.5 and contains fluorine at a cooling speed of 3°C/min or less from a slag discharge temperature to 500°C, mineral phases containing fluorine in this slag are made not to be the (2CaO*SiO<SB>2</SB>)<SB>2</SB>*CaF<SB>2</SB>phase, (3CaO*SiO<SB>2</SB>)<SB>3</SB>*CaF<SB>2</SB>phase and 3CaO*SiO<SB>2</SB>-CaF<SB>2</SB>phase whose hydration reactivities are large, but to be the 3CaO*2SiO<SB>2</SB>*CaF<SB>2</SB>phase and 2CaO*SiO<SB>2</SB>-CaF<SB>2</SB>phase whose hydration reactivities are small. COPYRIGHT: (C)2011,JPO&INPIT |
