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Process of extracting zinc from dedusting ash of blast furnace

A blast furnace dust removal and process technology, which is applied in the field of blast furnace dust removal and zinc extraction, can solve problems such as environmental pollution and high energy consumption, and achieve the effects of environmental friendliness, low process energy consumption and high recovery rate.

Active Publication Date: 2017-05-24
邹平县神鲁纳米材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the zinc oxide grade obtained is 51%, the recovery rate reaches 76.7%, then, this process consumes a lot of energy and causes serious pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 A process for extracting zinc from blast furnace dust

[0028] The specific process is as follows:

[0029] (1) Ball milling process

[0030] ①The blast furnace dust ash enters the receiving bin, and the terminal of the belt conveyor is equipped with a water feeding hopper. After adding water, the blast furnace dust ash enters the wet ball mill in a spiral manner with water as a carrier for ball milling.

[0031] ②The blast furnace dust ash is fully slurried and finely ground in the ball mill and overflows the ball mill and enters the discharge chute.

[0032] (2) Magnetic separation process

[0033] ① The blast furnace dust slurry after ball milling naturally flows from the discharge chute of the ball mill into the primary magnetic separator, and the ferromagnetic materials separated from it enter the secondary magnetic separator for selection.

[0034] ②The iron concentrate obtained after selection flows into the iron concentrate sedimentation tank through the concentra...

Embodiment 2

[0047] Example 2 A process for extracting zinc from blast furnace dust removal ash

[0048] The specific process is as follows:

[0049] (1) Ball milling process

[0050] ①The blast furnace dust ash enters the receiving bin, and the terminal of the belt conveyor is equipped with a water feeding hopper. After adding water, the blast furnace dust ash enters the wet ball mill in a spiral manner with water as a carrier for ball milling.

[0051] ②The blast furnace dust ash is fully slurried and finely ground in the ball mill and overflows the ball mill and enters the discharge chute.

[0052] (2) Magnetic separation process

[0053] ① The blast furnace dust slurry after ball milling naturally flows from the discharge chute of the ball mill into the primary magnetic separator, and the ferromagnetic materials separated from it enter the secondary magnetic separator for selection.

[0054] ②The iron concentrate obtained after selection flows into the iron concentrate sedimentation tank through t...

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Abstract

The invention relates to a process of extracting zinc from dedusting ash of a blast furnace, and belongs to the technical field of comprehensive utilization of metallurgic solid wastes. The process comprises the steps of a ball milling process, a magnetic separation process, a flotation process, a filter pressing process, a waste water recovery process, a caustic soda flake leaching process and electrolysis. In the caustic soda flake leaching process, sodium hydroxide is firstly added in tailing slag for filter pressing; then, sodium sulfide is added in filtrate for filter pressing again; and bone glue or potassium alkyl diphenyl ether sulfonate is added in the filtrate for electrolysis. The process can effectively extract zinc elements from the dedusting ash of the blast furnace through the caustic soda flake leaching process; and the whole process is low in energy consumption, environment-friendly and high in recovery rate of zinc.

Description

Technical field [0001] The invention relates to a process for extracting zinc from blast furnace dust removal ash, and belongs to the technical field of comprehensive utilization of metallurgical solid waste. Background technique [0002] Although the blast furnace dust generated during the production process of blast furnace contains a large amount of iron fine powder and carbon fine powder, it cannot be directly returned to the steel plant for recycling because it contains harmful elements such as zinc and lead. If it is recycled, it will lead to the recycling of zinc. . Zinc is reduced to gaseous zinc by carbon monoxide in the blast furnace. Zinc vapor with a boiling point of 907°C can be mixed into the furnace wall and combined with the furnace lining to form low melting point compounds to soften the furnace lining, accelerate the corrosion rate of the furnace lining, and shorten the life of the furnace; zinc vapor infiltrates and sinters In the gap between ore and coke, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B19/30C22B19/20C25C1/16C22B1/00
CPCC22B1/005C22B7/008C22B7/02C22B19/24C22B19/30C25C1/16Y02P10/20
Inventor 徐公美董杰
Owner 邹平县神鲁纳米材料科技有限公司
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