| 摘要 |
PURPOSE:To improve the reducing efficiency of a reducing gas and the quality and stabilization of metallic powder by providing air permeability to a belt for moving unreduced metallic powder continuously to the furnace and supplying the reducing gas to the inside of furnace walls in such a way as to flow through the belt. CONSTITUTION:Metallic powder 19 is packed in a hopper 18, and the inside of furnace walls is heated. While a reducing gas is kept introduced through an introducing port 27 into furnace walls 31, an endless track belt 12 made of meshed steel is run in a direction A. The powder 19 delivered at a specified rate from the hopper 18 is heated from a supply area 15 to a heating area 16, and contacts with the reducing gas passing through the belt 12, by which the powder is reduced. The residual reducing gas after used for the reduction is discharged through a discharging port 21. Here, the powder 19 sinters to each other and loses fluidity; therefore, the powder does not drop through the belt 12. The reducing gas is discharged after the gas intersects with the belt 12 and the laminar powder 19 through the openings 22 of the holding means 24 of the belt 12. The gas is brought into contact with the 100% powder 19 by the projecting plates 26 on the furnace walls on both sides of the means 24. |
