| 摘要 |
<p>A method for manufacturing a Fe-Ni alloy mass with excellent strength and high purity more economically by pelletizing FeNi powder in the middle of reduction heat treatment, thereby utilizing FeNi-containing sludge is provided. A method for manufacturing Fe-Ni alloy mass using FeNi-containing sludge comprises the steps of: neutralizing FeNi-containing sludge with a neutralizer to remove chlorine from the FeNi-containing sludge, and drying the chlorine removed FeNi-containing sludge to a moisture content of 5% or less; deagglomerating the dried sludge into powder with an average particle size of 30 to 700 mum; molding the deagglomerated powder into an molded body with a molding density range of 1.7 to 4.7 g/cc; increasing temperature of the molded body at a temperature increasing rate of 100 deg.C/min or less to sinter the molded body at 500 to 950 deg.C; performing heat treatment of the sintered material by primarily reducing the sintered material in a temperature range of 500 to 750 deg.C under a reductive gas atmosphere for 15 to 60 minutes, and secondly reducing the primarily reduced sintered material in a temperature range of 750 to 1000 deg.C for 15 to 60 minutes such that sintering reaction is occurred during the reduction; and cooling and extracting the reduced and sintered alloy mass.</p> |
