Blast furnace-rotary kiln co-processing method for dust containing zinc and iron

A collaborative processing and rotary kiln technology, applied in the field of iron and steel metallurgy and environmental protection, can solve the problems of low amount of blast furnace gas and mud, adverse effects of material application, etc., and achieve the effect of efficient utilization and recycling

Active Publication Date: 2021-11-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the dry dust removal method is generally used in blast furnaces, and the amount of blast furnace gas and mud is small, which is not well combined with the current blast furnace technology, and a new accelerator CaCO is added to this method 3 and Na 2 CO 3 , these two accelerators belong to alkali metal additives, and alkali metal substances will remain in the treated material, which will have an adverse effect on the further application of the treated material

Method used

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  • Blast furnace-rotary kiln co-processing method for dust containing zinc and iron

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Effect test

Embodiment 1

[0050] Embodiment 1 of the present invention provides a method for co-processing blast furnace-rotary kiln dust containing zinc and iron, comprising the following steps:

[0051] S1, using the zinc-containing and iron-containing dust produced by the blast furnace as the main raw material, then adding the flux quicklime and reducing agent coke powder to fully stir to obtain a mixed material; in the zinc-containing and iron-containing dust of the blast furnace, the zinc content is 9.0%; among them, according to Blast furnace zinc and iron dust: quicklime: coke powder: water are batched in a mass ratio of 70:15:15:12. In order to ensure the full reduction of zinc oxide in the dust, it should be ensured that the C / O in the mixed material should be kept at 1.1-1.3.

[0052] S2. Since the particle size of iron and steel zinc-containing iron dust is generally 2-50 μm, and the particle size diameter is relatively small, it is easy to cause ring formation in the rotary kiln. Therefore,...

Embodiment 2

[0059] Embodiment 2 of the present invention provides a method for co-processing blast furnace-rotary kiln dust containing zinc and iron, comprising the following steps:

[0060] S1, using zinc and iron dust produced by blast furnace as the main raw material, then adding electric furnace dust, flux quicklime and reducing agent coke powder to fully stir to obtain a mixed material; among them, according to blast furnace zinc and iron dust: electric furnace dust: quicklime: Coke powder: water is batched in a mass ratio of 50:25:15:10:12.

[0061] S2, making the mixed material into zinc-containing iron dust particles with a particle size diameter of 3-5 mm.

[0062] S3. Drying and preheating the zinc-iron dust particles prepared in step S2 to obtain dried zinc-iron dust particles; the drying and preheating time is 40 minutes.

[0063] S4, sending the dried zinc-iron dust particles prepared in step S3 into a rotary kiln through a feeding device, and performing high-temperature red...

Embodiment 3

[0068] Embodiment 3 of the present invention provides a method for co-processing blast furnace-rotary kiln dust containing zinc and iron, comprising the following steps:

[0069] S1, using the zinc and iron dust produced by the blast furnace as the main raw material, then adding electric furnace dust, iron oxide scale, flux quicklime and reducing agent coke powder to fully stir to obtain the mixed material; among them, according to blast furnace zinc and iron dust: electric furnace dust : iron oxide scale: quicklime: coke powder: water is the mass ratio of 30:25:20:15:10:12 for batching.

[0070] S2, making the mixed material into zinc-containing iron dust particles with a particle size diameter of 3-5 mm.

[0071] S3. Drying and preheating the zinc-iron dust particles prepared in step S2 to obtain dried zinc-iron dust particles; the drying and preheating time is 40 minutes.

[0072] S4, sending the dried zinc-iron dust particles prepared in step S3 into a rotary kiln through...

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Abstract

The invention provides a blast furnace-rotary kiln co-processing method for dust containing zinc and iron. The method utilizes a rotary kiln in cooperation with a blast furnace, and adopts an open circuit circulation mode to treat dust containing zinc and iron in the blast furnace. In the present invention, the rotary kiln uses blast furnace zinc and iron dust as the main raw materials, and the zinc dust particles are made through mixing, granulation, drying and preheating processes, and the hot air used in the drying process comes from the high temperature flue gas of the rotary kiln through heat exchange. The hot air obtained by the equipment; then the dried zinc-containing dust particles are added to the rotary kiln for high-temperature reduction roasting, and the reduced metallic zinc volatilizes at about 907°C and becomes zinc vapor, which leaves the rotary kiln with the flue gas and is Zinc oxide is formed in the recovery system, thereby realizing the enrichment and recovery of zinc. The high-temperature dust particles after dezincification are turned into direct reduced iron, which are made into dezincified hot-briquettes through the hot-briquetting process, returned to the iron recovery system, and then enter the blast furnace for high-temperature melting treatment to achieve full recovery of metallic iron.

Description

technical field [0001] The invention relates to the technical field of iron and steel metallurgy and environmental protection, in particular to a method for co-processing dust containing zinc and iron by a blast furnace and a rotary kiln. Background technique [0002] Zinc-containing dust in iron and steel enterprises is a kind of solid waste produced in the iron and steel production process, which has the characteristics of various industrial types, huge output, and complex composition. At present, iron and steel enterprises mostly deal with zinc-containing dust in a closed-circuit cycle, that is, the zinc-containing dust is added to the sintering process, and the zinc element enters the blast furnace again along with the sinter, and is enriched in the blast furnace cycle, and part of it is recycled as dust again. The form leaves the blast furnace and is added to the sintering process, which is repeated in turn. This mode inevitably has the problem of zinc enrichment. Zinc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B19/30C22B19/20C21B3/04C21B5/00
CPCC21B3/04C21B5/00C22B7/04C22B19/20C22B19/30Y02W30/50Y02P10/20
Inventor 张建良李洋刘征建徐润生
Owner UNIV OF SCI & TECH BEIJING
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