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Method for preparing high strength green pellets from steel plant iron-containing dust

A high-strength, dusty technology, applied in the field of iron and steel metallurgy, can solve the problems of poor spheroidization, large differences in surface hydrophilicity, difficulty in spheroidization, etc., and achieve the effects of low production cost, advanced technical indicators and simple process flow.

Active Publication Date: 2013-04-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the particle size composition, water content and surface hydrophilicity of this type of dust, sulfuric acid slag and coking furnace sludge are very different, and the spheroidization is poor and difficult to spheroidize.
Therefore, the recycling of such dust, sulfuric acid slag and coking furnace sludge is limited

Method used

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  • Method for preparing high strength green pellets from steel plant iron-containing dust

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Raw material ratio (by weight on a dry basis): converter sludge 20%, gas sludge 5%, coking furnace sludge 10%, dry dust 15%, gas ash 10%, sulfuric acid slag 20%, quicklime 10%, Coal powder 10%. The mixture was mixed three times according to the process, and after being stored for 8 hours, it was added to a moistening mill for moistening. The moisture content of the moistening material was 8%, the time for moistening was 3 minutes, the time for pelletizing was 12 minutes, and the moisture content for pelletizing was 15%. Green balls: The water content of green balls is 13.3%, the drop strength of green balls is 4.2 times / 0.5m, the compressive strength of green balls is 11.0Newton / piece, and the particle size of green balls is 5-16mm.

Embodiment 2

[0025] Raw material ratio (by weight on a dry basis): converter sludge 25%, gas sludge 5%, dry dust 8%, gas ash 17%, sulfuric acid slag 20%, quicklime 10%, coal powder 15%. The mixture was mixed three times according to the process, and after being stored for 8 hours, it was added to a moistening mill for moistening. The moisture content of the moistening material was 7.3%, the moistening time was 3 minutes, the pelletizing time was 12 minutes, and the pelletizing moisture was 15%. Green balls: The water content of green balls is 12.3%, the drop strength of green balls is 4.2 times / 0.5m, the compressive strength of green balls is 11.0Newton / piece, and the particle size of green balls is 5-16mm.

Embodiment 3

[0027] Raw material ratio (by weight on a dry basis): converter sludge 20%, gas sludge 5%, dry dust 10%, gas ash 15%, sulfuric acid slag 25%, quicklime 10%, coal powder 15%. The mixture was mixed three times according to the process, and after being stored for 8 hours, it was added to a moistening mill for moistening and grinding. The moisture content of the moistening material was 8.8%, the moistening time was 3 minutes, the pelletizing time was 12 minutes, and the pelletizing moisture was 14%. Green balls: The water content of green balls is 15.3%, the drop strength of green balls is 6.3 times / 0.5m, the compressive strength of green balls is 12.0 Newton / piece, and the particle size of green balls is 5-16mm.

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Abstract

The present invention relates to a method for preparing high strength green pellets from steel plant iron-containing dust. The method comprises the following steps: taking sludge, dry dust, sulfuric acid residue, dry coal fines, and quick lime to prepare the materials; uniformly stirring the sludge, mixing the sludge with the dry dust, the sulfuric acid residue, the dry coal fines, and the quick lime, stirring and uniformly dispersing, and carrying out piling-ripening for 8-24 hours to obtain a mixed clinker; and carrying out damp milling and balling on the mixed clinker. The method of the present invention has the following advantages that: the process is simple, the production cost is low, and the technical indicators are advanced. The prepared green pellets have characteristics of water content of 10-15%, falling strength of 4-8 times / 0.5 m, compressive strength of 10-15 Newton / per pellet, and granularity of 5-16 mm, and provide high-quality raw materials for the subsequent successful metal pellets sintered roasting dezincification. In addition, the method is suitable for industrial application.

Description

Technical field: [0001] The invention discloses a method for preparing high-strength green pellets from iron-containing dust in steel mills, belonging to the technical field of iron and steel metallurgy. Background technique [0002] Iron-containing dust is a by-product produced in the process of ironmaking and steelmaking in iron and steel plants. It mainly comes from sintering, blast furnace ironmaking, converter steelmaking dust removal and coking furnace sewage treatment. It contains mainly valuable elements such as iron and carbon. In addition, it also contains Lead, zinc, arsenic and other harmful elements, among which zinc has a certain recycling value. In addition, sulfuric acid slag is also an important iron-containing secondary resource. Therefore, this kind of dust and slag has important comprehensive utilization value for iron and steel enterprises, but direct recycling will easily cause the enrichment of harmful elements in the blast furnace, affect the stable ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24
CPCY02P10/20
Inventor 潘建朱德庆李启厚春铁军郑国林王林
Owner CENT SOUTH UNIV
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