Process for recycling zinc and producing molten iron by using iron-containing zinc dust

Abstract

The invention relates to a process for recycling zinc and producing molten iron by using iron-containing zinc dust. The process is characterized by comprising the following steps: S1, uniformly mixing iron-zinc dust, iron ore powder and additives in a mixing machine, feeding the mixture into a sintering machine to be sintered, crushing and screening the sintered ore, and subsequently feeding into a furnace; S2, uniformly mixing grinded powder coal with an adhesive, and pressing into shaped coal; S3, feeding the sintered ore and the shaped coal into a blast furnace so as to react the sintered ore and the shaped coal in the blast furnace to generate molten iron and zinc vapor, and discharging out the zinc vapor along with dust and coal gas from the blast furnace; S4, primarily removing the dust of the coal gas with the zinc vapor, and subsequently feeding into a heat exchanger to exchange the heat; S5, feeding the coal gas after heat exchange into a fine dust remover to remove the dust so as to obtain gas mud, and feeding the gas mud into a settling pond to be filtered, settled and thickened; and S6, drying the thickened gas mud so as to obtain powder rich in zinc. By adopting the process, the problem that the blast furnace production is not smooth because of zinc circulation enrichment in steel companies can be solved, zinc and iron in dust can be economically recycled, carbon can be efficiently utilized, and comprehensive utilization of resources is achieved.

Description

technical field [0001] The invention relates to a process for recovering zinc and producing molten iron by using dust containing iron and zinc. Background technique [0002] Zinc is a non-ferrous metal closely related to iron and steel enterprises. 50% of the annual zinc output is used to produce galvanized products. These materials are returned to the steel production process after being used and scrapped. At the same time, zinc in ore is another source of zinc in the steel production process. At present, many iron and steel enterprises have the problem that zinc is harmful to blast furnaces. [0003] Due to the low boiling point and volatile nature of zinc, it is easily reduced under conventional blast furnace smelting conditions, erodes the brick lining of the furnace throat and furnace body, and forms furnace nodules. At the same time, the zinc vapor in the furnace will also block the gap between iron ore and coke, affecting the air permeability of the blast furnace, w...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a process for recovering zinc and producing molten iron by using dust containing iron and zinc, which can solve the problem of unsmooth production of blast furnaces caused by zinc cycle enrichment in iron and steel enterprises, so that zinc and iron in dust can be economically recovered, Efficient use of carbon to achieve comprehensive utilization of resources

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