| 摘要 |
PURPOSE:To increase the yield of Mn and to manufacture a high-Mn ferrous alloy efficiently and inexpensively by repeating a two-stage operation consisting of manufacturing a high-Mn ferrous alloy and of forming a low-Mn ferrous alloy by adding an iron source to the high MnO concentration slag forming at the above stage so as to eliminate the slag. CONSTITUTION:A top and bottom blown convertor-type reaction vessel containing a molten ferrous alloy of <=20wt% Mn content is charged with Mn ore, slagging agent and carbon material, which is subjected to blow smelting by the ordinary method to undergo heating, melting and reduction so that the Mn content of the molten alloy is 40wt%, which is then taken out to undergo casting (the primary stage). The melt which is allowed to remain at the primary stage is charged with the iron source, slagging agent and carbon material, which is subjected to blow smelting to undergo heating, melting and reduction so that the molten ferrous alloy of <=20wt% Mn content is formed and the MnO content of the slag is reduced to <=10wt% to carry out slag elimination (the secondary stage). By alternately performing the primary and the secondary stages, melting-reducing smelting of high-Mn ferrous alloy can be carried out in high efficiency. |
