УСТРОЙСТВО И СПОСОБ РЕЦИРКУЛЯЦИИ ЖЕЛЕЗОСОДЕРЖАЩИХ ПЫЛИ И ШЛАМА В ПРОЦЕССЕ ПРОИЗВОДСТВА ЧУГУНА С ИСПОЛЬЗОВАНИЕМ УГЛЯ И РУДНОЙ МЕЛОЧИ

摘要

An apparatus and method for recovering Zn component contained in dust and sludge by vaporization and Fe component in the form of molten iron by reduction to reduce cost of sludge treatment and to prevent environmental pollution. A plurality of raw material feed bins (110a, 110b and 110c) respectively store and discharge dust/sludge (which is dewatered, dried and crushed), binder and fine iron ore by fixed quantities. An agitator (100) mixes and agitates a certain quantity of dust/sludge, binder and fine iron ore fed from the raw material feed bins (110a, 110b and 110c). A pelletizer (90) coarsens raw material mixture from the agitator (100) into certain particle sizes of pellets. A drier (80) dries the pellets supplied from the pelletizer (90). A shaft furnace (70) is connected to the melter gasifier (40) via a fifth gas duct (44) for receiving the pellets from the drier (80) and vaporizing Zn component contained in the pellets by reduction gas, and includes a sixth gas duct (71) in an upper portion thereof for emitting exhaust gas containing vaporized Zn component and a screw feeder (72) for outwardly discharging reduced iron pellets which are reduced by reduction gas. A hot enclosed screen (60) sorts the reduced iron pellets discharged from the screw feeder (72) into large and small (disintegrated) ones according to particle sizes and has fifth and sixth ore ducts (61 and 62) for selectively feeding the sorted pellets into a melter gasifier (40) and a briquetting machine (50).