| 摘要 |
The invention relates to a method for producing granular metal iron, comprising the forming raw materials containing a carbon reductant and iron oxide-containing substances are heated in a reduction melting furnace, the iron oxide in the forming raw materials is carried out the solid-state reduction; the reducted iron which is obtained from the solid-state reduction uses the carbon which is contained in the carbon reductant to carry out the carburization to melt the reducted iron, at the same time, the contained gangue component in the forming raw materials is separated, the obtained fused metal iron is coagulated into the granular metal iron, wherein, the atmospheric gas which is in the vicinity of the forming raw materials at the carburization and the melting stages has the reduction degree of not less than 0.5. The invention further relates to a method for producing metal iron, comprising that: a sediment layer which contains the generated furnace slag during the reduction melting process is formed on a hearth refractory material, thus protecting the hearth refractory material to produce the metal iron. The invention also relates to a device for supplying auxiliary raw materials which is applicable to the hearth of the movable hearth type reduction melting furnace for producing the metal iron, and the device includes a material supply pipeline which is vertically connected with the top part of the melting furnace. |
