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Method for comprehensive recovery treatment of zinc-containing metallurgical dust and sludge

A technology for metallurgical dust and sludge recovery and treatment, which is applied in chemical instruments and methods, improvement of process efficiency, photography process, etc., can solve the problems of slow dissolution rate of electric furnace dust, long process processing time, difficult leaching or reduction, etc. Conducive to the recovery of iron resources, the realization of green metallurgy, the effect of simple equipment

Inactive Publication Date: 2018-09-18
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this technology has the advantages of low energy consumption, recyclable ionic liquid, and less environmental pollution, there are also some problems, such as the slow dissolution rate of electric furnace dust in ionic liquid, which leads to a long process time, and at the same time The extraction rate of zinc is low
The reason is that zinc in zinc-containing dust mainly exists in the form of zinc oxide and zinc ferrite. Zinc oxide is an amphoteric oxide and is easily soluble in acid or alkali. This part of zinc can be completely leached. The covalent bonds in the form of oxygen ions in the row, the structure is very high temperature, difficult to leaching or reduction, so the leaching or reduction of zinc in zinc ferrite has become the main problem in the recovery of zinc from electric furnace dust

Method used

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  • Method for comprehensive recovery treatment of zinc-containing metallurgical dust and sludge
  • Method for comprehensive recovery treatment of zinc-containing metallurgical dust and sludge

Examples

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Embodiment 1

[0024] A method for comprehensive recovery and treatment of zinc-containing metallurgical dust, the process of which is as follows figure 1 Shown, including the following processes and steps:

[0025] The composition of zinc-containing metallurgical dust in the present embodiment is as follows: Fe 2 o 3 (converted content of total iron) ≤ 80wt%, ZnO ≤ 15wt%, others ≤ 5wt%. Grind zinc-containing metallurgical dust to less than 75 μm, dry it, add solid reducing agent coal powder for thorough mixing, and then reduce and roast in a closed high-temperature furnace at 850°C for 1 hour. The reduced powder is cooled, crushed, ground, and magnetically separated to obtain an iron-rich powder with a TFe grade of 89.5% and a zinc-rich powder with a Zn grade of 34.2wt%. The yield of iron is 95%, and the yield of zinc The yield was 92%. The iron-rich powder is returned to the factory for direct recycling; the zinc-rich powder is added to the choline chloride-urea (molar ratio 1:2) low-e...

Embodiment 2

[0027] The composition of zinc-containing metallurgical dust in the present embodiment is as follows: Fe 2 o 3 (Content in total iron conversion) ≤ 60wt%, ZnO ≤ 25wt%, others ≤ 15wt%. Grind zinc-containing metallurgical dust to less than 75 μm, dry it, add solid reductant carbon powder for thorough mixing, and then reduce and roast in a closed high-temperature furnace at 750°C for 1.5 hours. After the reduction, the powder is cooled, crushed, ground, and magnetically separated to obtain an iron-rich powder with a TFe grade of 85.6wt% and a zinc-rich powder with a Zn grade of 45.2wt%. The yield of iron is 93%, and the yield of zinc The yield was 91%. The iron-rich powder is returned to the factory for direct recycling; the zinc-rich powder is added to the choline chloride-urea (molar ratio 1:2) low-eutectic solvent, stirred and leached at 65°C for 10 hours, and then separated by suction filtration to obtain Leachate and filter residue, the yield of zinc in the leachate is 88...

Embodiment 3

[0029] The composition of zinc-containing metallurgical dust in the present embodiment is as follows: Fe 2 o 3(converted content of total iron) ≤ 75wt%, ZnO ≤ 15wt%, others ≤ 10wt%. Grind the zinc-containing metallurgical dust to less than 75μm, dry it, and then put it into a closed high-temperature furnace. The CO gas with a gas volume of 30% was used for reduction roasting at 800° C. for 2 hours. After the reduction, the powder is cooled, crushed, ground, and magnetically separated to obtain an iron-rich powder with a TFe grade of 82.6wt% and a zinc-rich powder with a Zn grade of 29.2wt%. The yield of iron is 92%, and the yield of zinc The yield was 90%. The iron-rich powder is returned to the factory for direct recycling; the zinc-rich powder is added to choline chloride-urea (molar ratio 1:2) low-eutectic solvent, stirred and leached at 75°C for 30 hours, and then separated by suction filtration to obtain Leachate and filter residue, the yield of zinc in the leachate i...

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Abstract

The invention relates to a method for comprehensive recovery treatment of zinc-containing metallurgical dust and sludge and belongs to the technical field of solid waste treatment crossing metallurgical engineering and environmental engineering. Separation of iron and zinc is achieved by selective reduction and magnetic separation of the zinc-containing metallurgical dust and sludge. Zinc coordination dissolution is achieved through zinc-rich powder leaching with a low eutectic solvent. High-purity zinc extraction is then achieved through electrochemical extraction of the leachate. The methodhas advantages of a simple process, mild conditions, environmental friendliness, a low cost and the like, can comprehensively recover iron and zinc metal elements in the zinc-containing metallurgicaldust and sludge, and achieves efficient separation and extraction of zinc.

Description

technical field [0001] The invention relates to a method for comprehensive recovery and treatment of zinc-containing metallurgical dust and sludge, and belongs to the technical field of solid waste treatment intersecting metallurgical engineering and environmental engineering. Background technique [0002] Modern iron and steel production mainly uses blast furnace ironmaking, converter and electric furnace steelmaking as the main methods, and a large amount of dust and sludge are generated in the production process. A large amount of dust is one of the main pollution sources of iron and steel plants, and it is also a secondary resource that can be used by iron and steel plants. Dust not only has high iron content, but also has high zinc and lead content. The source of zinc in the dust is mainly galvanized scrap steel and iron-zinc symbiotic ore used in steelmaking process. Zinc in iron ore and steel scrap volatilizes and oxidizes in the furnace and almost all enters the du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B19/30C22B7/00C22B19/20C25C1/16B03C1/02C22B1/02
CPCB03C1/02C22B1/02C22B7/001C22B7/008C22B19/24C22B19/30C25C1/16Y02P10/20
Inventor 许继芳杨莹郭恒睿程晨翁文凭盛敏奇
Owner SUZHOU UNIV
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