| ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ KAWASAKI STEEL TECHNICAL REPORT No.22 ( May 1990 ) Advanced Technologies of Iron and Steel, Commemorating the 20th Anniversary of the Technical Research Division ‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘‘ |
| Ferroalloy Production by Smelting Reduction Process with Coke-Packed Bed Hiroshi Itaya, Hideshi Katayama, Takao Hamada, Masahiko Sato, Takashi Ushijima, Hideyuki Momokawa |
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Synopsis : A new smelting reduction process with coke-packed bed (Kawasaki's STAR process) has been developed to produce ferroalloys or pig iron, by using low grade coke and fine ores. The process is characterized by (1) coke-packed bed shaft furnace, (2) installation of two-stage tuyeres, (3) direct use of fine one without agglomeration, (4) gravitational powder transportation and injection through the upper tuyere, and (5) fluidized bed pre-reduction furnace for full utilization of a by-product gas. Bench scale tests of smelting reduction, gravitational powder transportation and fluidized bed pre-reduction were carried out independently to confirm the principle and the effectiveness. Campaigns of the pilot plant test for the production of ferrochromium were successfully done in 1986. The scale-up for ferrochromium production of 100 t/d was investigated, and the production cost by the process was shown to be more economical than that by an electric furnace. |
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