Method for recycling valuable elements from blast furnace flocculated dust

A valuable element, blast furnace technology, applied in chemical instruments and methods, wet separation, solid separation, etc., can solve the problems of poor efficiency and high cost, and achieve the effect of low production cost, reduced loss, and good comprehensive recovery and utilization effect.

Inactive Publication Date: 2014-02-05
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of high cost and poor benefit in the blast furnace flocculation dust sludge treatment method in the prior art, and provide a combined process of flotation-magnetic separation-gravity sep

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  • Method for recycling valuable elements from blast furnace flocculated dust
  • Method for recycling valuable elements from blast furnace flocculated dust
  • Method for recycling valuable elements from blast furnace flocculated dust

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Embodiment Construction

[0022] This embodiment discloses a method for recovering valuable elements from blast furnace flocculation dust and sludge. The method is a process for processing low-grade blast furnace flocculation dust and sludge containing 2-8% zinc by mineral processing, and adopts flotation-magnetic separation-gravity Choose the combined process method to recover the valuable elements. For specific steps, see figure 1 :

[0023] A. Grinding, grading, concentrating

[0024] The blast furnace ironmaking bag ash (easy to sort) is first ground and classified with a fine sieve. The fineness of the product under the sieve after classification is between -200 mesh and 75-85%. The product on the sieve is concentrated and ground before returning to the classification operation . Due to its fineness, blast furnace dedusting sludge directly enters the fine sieve for classification, and the products on the sieve are returned to grinding;

[0025] Blast furnace bag ash TFe20—35%, C30—38%, SiO...

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Abstract

A method for recycling valuable elements from blast furnace flocculated dust adopts a process integrating flotation, magnetic separation and reselection to treat low-grade blast furnace flocculated dust with a 2 to 8 percent zinc content and recycle the valuable elements in the low-grade blast furnace flocculated dust, and comprises the following specific steps: firstly, conducting ore grinding on blast furnace cloth bag dust, sieving the blast furnace cloth bag dust with a fine screen for fineness classification, conducting ore grinding on coarse graded products on the fine screen, returning the coarse graded products for classification, placing the blast furnace flocculated dust on the fine screen directly for classification, returning products on the fine screen to a grinding machine, mixing and then concentrating products under the fine screen after classification, adding a medicament into the concentrated product, carrying out flotation including twice roughing and once fine screening, and carrying out classification to obtain carbon ore concentrate, iron ore concentrate and final tailing serving as a raw material in pyrometallurgy of zinc oxide. The method has the advantages that the process is simple; the energy consumption and the manufacturing cost are low; the comprehensive recycle effect is good; the selected carbon ore concentrate can serve as injection coal of steel enterprises; the selected iron ore concentrate can return to a pelletizing process directly; the final tailing (a zinc-rich material) is used for pyrometallurgy to extract zinc oxide.

Description

technical field [0001] The invention relates to a method for comprehensively recycling valuable elements in blast furnace flocculation dust, in particular to a method for recovering valuable elements from blast furnace flocculation dust. Background technique [0002] Blast furnace ironmaking bag dust is a by-product discharged during the ironmaking process. Its main components are carbon and iron, and the particle size is relatively coarse. Generally, the content of -200 mesh is between 30-45%. Many domestic enterprises have adopted conventional It is recovered by advanced magnetic separation, flotation and gravity separation processes, with high efficiency and low cost. The product iron fine powder is returned to the granulation process, and carbon powder is used as coal injection. However, there is no better way to process and utilize the blast furnace flocculated dust. [0003] At present, there are two main ways to deal with blast furnace dust in foreign countries: cycl...

Claims

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Application Information

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IPC IPC(8): B03B7/00
Inventor 高志明孙达张锦瑞
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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