Pelletizing method for improving particle size of sintering mixture

A technology of sintering mixture and mixing system, which is applied in the field of iron and steel metallurgy, can solve the problems affecting the particle size composition of sintering mixture, achieve the effect of improving technical and economic indicators, ensuring uniformity, and improving particle size composition

Inactive Publication Date: 2020-10-02
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to affect the particle size composition of the sinter mixture after adding the sinter dust removal ash

Method used

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  • Pelletizing method for improving particle size of sintering mixture
  • Pelletizing method for improving particle size of sintering mixture

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Embodiment

[0031] Take by weighing two parts of dedusting ash and active ash whose quality is 2% and 7.5% of the total weight of sintered new material respectively, the first part of dedusting ash directly enters the first mixing and mixing (i.e. one-stage mixing granulation), and the active ash is digested and mixed (as Comparative example). In the second part, the dedusting ash is screened, the part below 0.25mm is mixed with the dedusting ash, then water is added to digest the active ash, and stirred to make a pulp. After the active ash above 0.25mm is directly digested, add a mix (Example) respectively, and then After two-stage mixing (that is, two-stage mixing granulation). Carry out sintering experiments, control the moisture content of the mixture within the range of 7.5%±0.2%, the first mixing time is 4min, the second mixing time is 4min, the amount of new sintering material is 70kg, the material layer is 700mm, and 30% of the returned ore (returned The ore is specially fired to...

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Abstract

The invention discloses a pelletizing method for improving the particle size of a sintering mixture and belongs to the field of ferrous metallurgy. Dedusting ash is mixed with fine-particle active lime to form a mixture; water is added for slaking; full stirring and slurrying are carried out, the mixture, coarse-particle active lime after slaking through adding water and other sintering materialsare mixed and pelletized to obtain the sintering mixture; the mixing, water adding and slaking process pre-wets the dedusting ash, at the same time, heat released through slaking of the active lime can raise the temperature of dedusting ash particles to increase the water absorption speed, and the the adverse impact of the hydrophobicity of the dedusting ash to sintering pelletizing is compensatedto certain degree. In addition, as the particles of the dedusting ash and the fine-particle active lime are smaller, core particles for pelletizing are not provided, and aggregation after mixing is avoided, slurry uniformity is ensured; and in addition, the active lime after slaking has viscousness and can be adhered to the dedusting ash particles, the pelletizing capacity is improved, and size composition of the sintering mixture is improved to improve the technical-economic indicator of sintered ore.

Description

technical field [0001] The invention belongs to the field of iron and steel metallurgy, and in particular relates to a granulation method for improving the particle size of sintered mixture. Background technique [0002] The sintering process is the process of mixing iron-containing materials, fuel and flux, adding water to granulate and sintering. The particle size and microscopic appearance of the sintering raw materials are important factors affecting the particle size of the sintering mixture. The vanadium-titanium sinter The main raw material is vanadium-titanium concentrate, its particle size itself is extremely fine, and its ball forming performance is poor, which makes the particle size of the mixture finer, and the gas permeability of the material layer is not as good as that of ordinary sintered ore. The composition of sintering dust removal ash contains more valuable elements, and most domestic iron and steel enterprises use it as sintering material. An increase ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 唐文博
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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