Iron-containing zinc powder recycling process

Abstract

The invention discloses a recycling process of iron-containing zinc powder generated in an iron and steel process. The process comprises the following steps: mixing dried iron-containing zinc powder with a binder, and pelletizing by a pelletizer to obtain green balls; feeding the green balls into a shaft furnace and heating to 1100-1300 DEG C; reducing iron in the shaft furnace to sponge iron; converting reduced zinc at high temperature into zinc steam which is discharged out of the shaft furnace with coal gas and enters into a two-stage dedustor; and feeding dedusting mud obtained from the dedustor into a settling pond, and filtering, settling, thickening and drying to obtain zinc powder. The iron-containing zinc powder mainly comprises blast furnace gas ash, gas mud, dedusting ash, converter steelmaking dust and continuous casting steel rolling scrap iron generated in the iron and steel production. By adopting a treatment mode of the shaft furnace, the problem such as large rotary kiln equipment, low utilization ratio of in-kiln volume and high energy consumption is solved. Coal base is directly reduced at a high speed, and meanwhile, zinc in dust is further recovered.

Description

technical field [0001] The invention belongs to the technical field of iron and steel production, and in particular relates to a recycling method for dust containing iron and zinc produced in the iron and steel process. Background technique [0002] With the development of my country's iron and steel industry, the impact of dust generated in the process of iron and steel production on the environment has become increasingly prominent. Generally speaking, the amount of dust in iron and steel enterprises is 8% to 12% of steel production. The annual dust output of iron and steel enterprises in my country reaches tens of millions of tons. These dusts contain a large amount of iron, as well as carbon, zinc, lead, potassium and other elements. . [0003] Usually, iron and steel enterprises collect these dusts and use them as sintering raw materials for recycling within the enterprise. Due to the fine particle size and large specific surface area of ​​these dusts, the addition of ...

AI Technical Summary

Problems solved by technology

The main problems in the treatment of zinc-containing dust in the rotary hearth furnace are the high exhaust temperature, low thermal efficiency, and the problem that zinc vapor condenses and blocks the exhaust channel, resulting in unsmooth production; (3) Oxycup dust treatment process: Oxycup shaft furnace adopts internal Coal blending briquettes, in order to ensure sufficient strength, need to use cement as a binder. The advantages of the shaft furnace are high thermal efficiency, sufficient reduction of metal oxides, and high metal yield; the disadvantage is that the coke ratio is high (for ordinary blast furnace ironmaking). 3 times), the utilization coefficient is low, and the content of S and P in molten iron is high