| 摘要 |
Metal production from oxidic ore, comprising tuyere injection of plastic supplied by a compressed air transport line (10) equipped with shut-off valves (24, 28, 29) for avoiding blockages and hot blast back-flow, is new. Metal production from oxidic ore comprises supplying fluidized plastic particles to tuyere injection lances (18) of a shaft furnace (1) by a transport line (10) equipped with shut-off valves (24, 28, 29), a compressed air entry connection (31) being provided in the transport line (10) or in each lance. The first shut-off valve (24) is closed when plastic blockage of the transport line or lances occurs; the second shut-off valve (28) is closed when hot air flows back through the injection lances (18); and the third shut-off valve (29) is closed when compressed air passes over and cools the injection lances. Independent claims are also included for the following: (1) a plant for carrying out the above process; and (2) a blast furnace in which the above process is carried out. |
