| 摘要 |
PURPOSE:To produce a magnetic metal powder excellent in magnetic characteristics by continuously supplying a granulated material to be reduced on a belt permeable to a gas in a reaction furnace, transferring the material, continuously heating and reducing the material with a reducing gas. CONSTITUTION:A reducing gas is introduced into a gas-circulated reaction furnace main body 40 from a reducing gas inlet 44, dispersed by a gas dispersing plate 42, supplied to a belt 41 permeable to the gas, passed through the hole in the belt 41 and discharged from a gas outlet 45. The inside of the furnace main body 40 is heated to a specified temp. by a heating means 43. Meanwhile, a material (consisting essentially of alpha-FeOOH, alpha-Fe2O3, etc.) to be reduced is continuously supplied on the belt 41 from an inlet 46 in <=25cm thickness, transferred in the A direction, continuously heated and reduced and discharged from an outlet 47. At this time, the reducing gas is vertically passed through the belt upward at a linear velocity of >=10cm/sec. As a result, a magnetic metal powder excellent in magnetic characteristic is obtained without the acicular shape being deformed or without the skeletal particles being adhered to one another by sintering. |
