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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 effects of low production cost, reduced loss and low energy consumption

Inactive Publication Date: 2015-07-01
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
  • Description
  • 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 separation, which has simple process, low energy consumption and high production efficiency. A method for recovering valuable elements from blast furnace flocculation dust and sludge with low cost, good treatment effect and high comprehensive utilization rate

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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 recovering valuable elements from blast furnace flocculation dust and sludge, which adopts a combined process of flotation, magnetic separation and gravity separation to process low-grade blast furnace flocculation dust and sludge containing 2-8% zinc to recover valuable elements. element. The specific steps include: firstly grind the blast furnace bag ash, and then use a fine sieve for coarse classification, and then return to the classification operation after grinding the product on the coarse-grained sieve; machine; the graded under-screen products are mixed and then concentrated, and added with chemicals for flotation. The flotation is divided into two roughings and one beneficiation. Zinc raw material final tailings. The invention has the beneficial effects of simple process, low energy consumption and low production cost. The comprehensive recycling effect is good. The selected carbon concentrate can be used as coal injection for steel enterprises, the iron concentrate is directly returned to the pelletizing process, and the final tailings (zinc-rich material) are 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...

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Application Information

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Patent Type & Authority Patents(China)
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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