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Method for treating blast furnace dust

A blast furnace dust removal and treatment method technology, which is applied in the field of metallurgy, can solve the problems of large dosage of flotation reagents, large fluctuations, and low iron powder selection rate, so as to reduce the dosage of flotation reagents, make full use of energy, and improve the selection rate. rate effect

Inactive Publication Date: 2005-11-23
LIUZHOU QINGYU ENVIRONMENTAL PROTECTION IND DEV
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Problems solved by technology

This process has a low selection rate for iron powder, and the grades of the selected iron powder and coke powder are low and fluctuate greatly. Generally, the iron content in the selected iron powder is about 55%, and the iron content in the coke powder is about 55%. Fixed carbon is about 72%
In addition, this process consumes a large amount of flotation agents, the process cost is high, the discharged wastewater contains more suspended solids, and the discharge volume is large, resulting in new and larger pollution to the environment.

Method used

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  • Method for treating blast furnace dust

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Experimental program
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Effect test

Embodiment

[0019] Embodiment: A steel company produces 30,000 tons of blast furnace dust per year, and its main chemical composition is as follows.

[0020] Total iron (%)

Metal iron (%)

Fixed carbon (%)

SiO 2 (%)

CaO(%)

P(％)

S(％)

22-39

20-32

17-30

0.1-1.5

0.1-0.6

0.005-0.05

0.035-0.120

[0021] The processing method of this blast furnace dedusting ash is:

[0022] A. Add water to blast furnace dedusting ash to make slurry, let the slurry mix with flotation agent in the first stage flotation machine for flotation, and separate the slurry with more carbon content from the slurry with more iron powder;

[0023] B. The slurry with more carbon content separated from the first-stage flotation machine is further flotation in the second-stage flotation machine to continue to separate coke powder and further improve the grade of coke powder;

[0024] C. Pump the slurry with more iron powder separated from the first and sec...

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Abstract

The present invention discloses an ash removal method for blast furnaces. It belongs to metallurgical technology field. Its main characteristic is mixing blast furnaces ashes with water to make slurry. The slurry is separated to obtain coke powder of high grade through the first and second floatation separation. The slurry containing more iron from first and second floatation machine is pumped into the first and second spiral chute. After gravity selection, magnetic selection, the high grade iron powder is obtained. The waste water passes through pressure filtration to recycle fine iron powder. The filtrated water is reused to make slurry for blast furnaces ash removal. The present invention is used to treat dedusting ashes from blast furnaces. As compared with the existing technologies, the invention can considerably increase the yield of iron powder selection and the grade of the iron powder and coke powder, and also avoid making new environment pollution.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a process method for treating flue gas dust containing certain iron powder and coke powder produced in the ironmaking production process. technical background [0002] The waste gas produced by ironmaking blast furnaces contains a lot of dust. When these dusts are discharged to the outside, they are generally collected by dry methods such as gravity dust removal and bag dust removal, and sometimes by wet methods. This kind of dust is usually called blast furnace dust removal ash or dry process ash, gas ash, etc. Blast furnace dust contains iron powder and coke powder which can still be used. Since the contents of these two different substances are relatively small, they are quite different from the technical requirements for raw materials in iron and steel smelting, so they can neither be used as iron powder ingredients nor as Coke powder is mixed in, so most of the steel mil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/04
CPCY02P10/20Y02W30/50
Inventor 黎伟汉李军罗承远王兴国吴文斌
Owner LIUZHOU QINGYU ENVIRONMENTAL PROTECTION IND DEV
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