| 摘要 |
Disclosed is a method for reprocessing metallurgical dust or grinding dust, especially converter dust and arc furnace dust obtained from steel or high-grade steel production. In said method, the dust is burned and slagged with oxygen in oxidizing conditions in a melt burner (1), and the obtained slag is introduced into an inductively heated reduction furnace (17) containing a coke bed (49). Carbon monoxide formed during the reduction of the slag is withdrawn at the top of the reduction furnace (17) as gas along with Zn vapor, whereupon Zn is condensed or the gas is reformed with water or steam so as to form ZnO and hydrogen and is redirected into the melt burner (1) after separating the ZnO. The inventive apparatus for carrying out the disclosed method is characterized in that a dosing cone (3) is provided which comprises a burner lance (4) and a feeding device for the charge and which extends into a diffuser (44) via a feeding zone having a reduced cross-section and via an annular slot (41) that surrounds the burner lance (4). Furthermore, the combustion chamber (1) adjoins the diffuser (44) while an inductively heated coke column is connected to a bottom discharge port of the combustion chamber as a reduction furnace whose top end is equipped with at least one connection (56) for feeding coke as well as an exhaust gas connection (50) for withdrawing carbon monoxide and Zn vapor. |
