Externally heated high-temperature reduction fuming calcining rotary kiln

Abstract

The invention discloses an externally heated high-temperature reduction fuming calcining rotary kiln. The externally heated high-temperature reduction fuming calcining rotary kiln is characterized in that a hearth external drum of a rotary drum (3) is provided with a high-temperature castable poured layer (2), the outer wall of the high-temperature castable poured layer (2) is reinforced by a steel plate shell (24), and a space between the steel plate shell (24) and the high-temperature castable poured layer (2) is filled with a heat-insulation material layer (1); oil and gas spray holes (5) are formed in a side of the rotary drum (3) and are communicated with an oil and gas ejection pipe (23) of an external heating system; a flue gas cooling and dust collecting device is arranged on a side of a kiln head of the rotary kiln, the temperature of a flue gas pipeline (10) of the flue gas cooling and dust collecting device keeps at 1050-1200 DEG C, and the temperature of an inlet of the flue gas cooling and dust collecting device is lower than 150 DEG C. The externally heated high-temperature reduction fuming calcining rotary kiln has the advantages that the externally heated high-temperature reduction fuming calcining rotary kiln can run stably and reliably and is high in metal oxide reduction rate and nonferrous metal evaporation rate, nonferrous metal in fume can be efficiently concentrated and recycled, the evaporation rate of lead in iron-bearing dust and the evaporation rate of zinc in the iron-bearing dust can respectively reach 90% and 95% at least, the grade of zinc oxide in the fume can reach 70% at least, and the occupation ratio of magnetic iron in calcined cinder can reach 80% at least.

Description

technical field [0001] The present invention relates to a rotary kiln, in particular to an external heating reduction roasting rotary kiln, which is used for high-temperature reduction fuming roasting of iron, lead, zinc and other valuable metals in comprehensive recovery and utilization of iron-containing dust and mud resources in ironworks and Recovery of valuable metal fumes. Background technique [0002] As we all know, my country is the world's largest steel producer, and the output of by-product gas mortar is also very large (about 10kg per ton of iron). Usually, gas plasters are rich in iron, carbon, a small amount of non-ferrous metals and trace rare metals. Most of the gas plasters are considered as "toxic solid waste" due to their relatively high content of zinc and lead. Lead is recycled. At present, in my country, a part of blast furnace gas ash is returned to the sintering process directly or through beneficiation to recycle the iron and carbon in it, and som...

AI Technical Summary

Problems solved by technology

However, this rotary kiln is not suitable for the comprehensive recovery and utilization of iron, lead, zinc and other valuable metals in iron-containing dust and mud resources in ironworks, high-temperature reduction fuming roasting and recovery of valuable metal flue gas

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