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Method for extracting valuable metals from fumes in steel plant

A technology of valuable metals and iron and steel plants, applied in the field of metallurgy, can solve problems such as complex treatment process, complex leaching process, and undetermined scheme, and achieve the effect of simplifying the process flow, simple process and required equipment, and preventing explosion

Inactive Publication Date: 2018-06-08
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent Nos. CN201210358206.2, CN201210357961.9, CN201210357962.3 and a series of ammonia process, the method is complex leaching process and complex treatment process, no feasible scheme for practical application

Method used

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  • Method for extracting valuable metals from fumes in steel plant

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Comparison scheme
Effect test

Embodiment 1

[0038] This embodiment is realized through the following steps:

[0039] 1) Blast furnace gas ash and steelmaking dust removal ash are pressed into balls with a diameter of 35 mm, wherein the total molar amount of metal oxides in the blast furnace gas ash and steelmaking dust removal ash is equal to the amount of coal powder in the blast furnace gas ash The molar ratio is 1:1; the mass content of fixed carbon in the added blast furnace gas ash is 20%; then the mixed spheres are put into the crucible, and then the whole is put into the vacuum reduction regenerative furnace, and the vacuum degree of 90Pa is placed in the Keep warm at 600°C for 4 hours. After the heat preservation is over, break the vacuum when the temperature in the furnace is lowered to 300°C, and take out the crucible;

[0040] 2) Perform magnetic separation on the reduced mixture to obtain iron concentrate, thereby separating valuable metals such as lead, zinc, indium and silver from the reduced mixture.

Embodiment 2

[0042] This embodiment is realized through the following steps:

[0043]1) Press the blast furnace gas ash and steelmaking dust removal mud into a mixing sphere with a diameter of 20mm, wherein the total molar amount of the added blast furnace gas ash and steelmaking dust removal mud and the molar amount of coal powder in the blast furnace gas ash The ratio of the amount is 6:1; the mass content of fixed carbon in the added blast furnace gas ash is 25%; then the mixed spheres are put into the crucible, and then the whole is put into the vacuum reduction regenerative furnace, with a vacuum degree of 50Pa at 1200 ℃ heat preservation for 0.5h, after the heat preservation is over, the vacuum is broken when the temperature in the furnace is lowered to 200 ℃, and the crucible is taken out;

[0044] 2) Perform magnetic separation on the reduced mixture to obtain iron concentrate, thereby separating valuable metals such as lead, zinc, indium and silver from the reduced mixture.

Embodiment 3

[0046] This embodiment is realized through the following steps:

[0047] 1) Press the blast furnace gas mud and steelmaking dust removal dust into a mixing sphere with a diameter of 25 mm, wherein the total molar amount of metal oxides of the added blast furnace gas mud and steelmaking dust removal dust is equal to the molar amount of pulverized coal in the blast furnace gas muddy The ratio of the amount is 12:1; the mass content of fixed carbon in the added blast furnace gas mud is 35%; then the mixed spheres are put into the corundum crucible, and then the whole is put into the vacuum reduction regenerative furnace, with a vacuum degree of 70Pa in the Keep warm at 1000°C for 2 hours. After the heat preservation is over, break the vacuum when the temperature in the furnace is lowered to 150°C, and take out the crucible;

[0048] 2) Perform magnetic separation on the reduced mixture to obtain iron concentrate, thereby separating valuable metals such as lead, zinc, indium and s...

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Abstract

The invention discloses a method for extracting valuable metals from fumes in a steel plant. The method comprises mixing or pelleting blast furnace gas ash (mud) and the steel-making fumes (mud) recovered from steel smelting to obtain a mixture or pellets, putting the mixture or pellets into a vacuum reduction heat storage furnace, carrying out heat preservation at 600-1300 DEG C at a vacuum degree of less than 100Pa for 0.5-6h to obtain a reduced mixture, and carrying out magnetic separation on the mixture to obtain refined iron ore. Through reasonable control of the carbon content of blast furnace gas ash (mud), the ratio of the blast furnace gas ash (mud) to the steel-making fumes (mud) and the temperature, pressure and time in the vacuum reduction process, the separation of valuable metals such as zinc, lead and indium and the comprehensive recovery of iron oxides are achieved in the vacuum reduction heat storage furnace. The whole process is carried out in the vacuum reduction heat storage furnace, produces the small influence on personnel and environment, needs simple processes and devices, is safe and controllable, is easy to operate and can effectively realize the comprehensive recovery and recycling of secondary resources of valuable metals in steel dust.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for extracting valuable metals from flue dust in iron and steel plants. Background technique [0002] The soot ash produced in steel production engineering mainly includes sintering machine head electrostatic precipitator ash, pellet dust ash, blast furnace gas ash (mud) and steelmaking dust ash (mud). [0003] Blast furnace gas ash (mud) [0004] In the production process of blast furnace ironmaking, for the solid waste generated in the dust removal process of the blast furnace, the solid waste collected by the dry bag filter is called gas ash, and the solid waste collected by the wet dust collector is called gas ash. Gas mud. Blast furnace gas ash (mud), recorded as blast furnace gas ash / mud, has a complex chemical composition. In addition to iron, it also contains valuable metals such as zinc, lead, and indium. According to statistics, the amount of ...

Claims

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Application Information

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IPC IPC(8): C22B7/02B03C1/015C22B1/24C22B1/248
CPCB03C1/015C22B1/2406C22B1/248C22B7/02Y02P10/20
Inventor 张朝晖马红周冯璐
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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