Method for treating iron-bearing dust using sintering process

A dust and process technology, applied in the field of iron and steel metallurgy iron-containing dust solid waste treatment process, can solve the problems of low spheroidization rate, dust pollution, increasing process complexity and processing cost, etc.

Inactive Publication Date: 2018-12-18
BEIJING SHOUGANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although the above two methods make dust-removing ash into pellets with better strength, the use of high-pressure roller mills and intensive mixers increases the process complexity and processing costs, and the use of some bentonite and modifiers increases the sintering raw materials. At the same time, due to the high hydrophobicity of the dedusting ash, it is easy to cause problems such as dust pollution and low pelleting rate during the disc pelletizing process.

Method used

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  • Method for treating iron-bearing dust using sintering process

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Effect test

Embodiment 1

[0039] Raw materials whose mass fraction ratio is as follows: 20% magnetic powder, 25% rich ore powder, 30% return ore, 16% limestone, 4% slaked lime, 5% coke powder are prepared into a sintering mixture, and the sintering mixture is carried out once Mixing; granulate the sintering dedusting ash which accounts for 10% of the total amount of sintering mixture through a cylinder mixer, and spray the prepared slaked lime suspension with a concentration of 10% on the dedusting ash through the nozzle in the cylinder mixer, At the discharge end of the cylinder mixer, the particles with a particle size of less than 3 mm are returned to the feed end of the cylinder mixer through a screening device, and re-granulated; the dust particles with a particle size of more than 3 mm and the sintering mixture are subjected to secondary granulation. Mix to obtain a sintered mixed material, the average particle size of the sintered mixed material is 5.2mm, and the sintered mixed material is distri...

Embodiment 2

[0044] Raw materials whose mass fraction ratio is as follows: 20% magnetic powder, 25% rich ore powder, 30% return ore, 16% limestone, 4% slaked lime, 5% coke powder are prepared into a sintering mixture, and the sintering mixture is carried out once Mixing; granulate blast furnace dedusting ash and converter dedusting ash each accounting for 3% of the total amount of sintering mixture through a cylinder mixer, and spray the prepared slaked lime suspension with a concentration of 20% through the nozzle in the cylinder mixer to the mixed dedusting ash, and return the particles with a particle size of less than 3mm to the feed end of the cylinder mixer through a screening device at the discharge end of the cylinder mixer, and re-granulate; The mixed materials are mixed together for the second time to obtain a sintered mixed material. The average particle size of the sintered mixed material is 4.7 mm. The sintered mixed material is distributed, sintered, crushed, cooled, and sieve...

Embodiment 3

[0049] Raw materials whose mass fraction ratio is as follows: 20% magnetic powder, 25% rich ore powder, 30% return ore, 16% limestone, 4% slaked lime, 5% coke powder are prepared into a sintering mixture, and the sintering mixture is carried out once Mixing: Blast furnace dust, converter dust and sinter dust, each accounting for 2% of the total amount of sinter mixture, are granulated together through a cylinder mixer, and the prepared slaked lime suspension with a concentration of 30% is passed through a cylinder mixer Spray the nozzle inside the cylinder mixer on the mixed dust, and return the particles with a particle size of less than 3mm to the feed end of the cylinder mixer through the screening device at the discharge end of the cylinder mixer for re-granulation; remove the dust with a particle diameter of more than 3mm The ash particles and the sintering mixture are mixed twice to obtain a sintering mixture. The average particle size of the sintering mixture is 4.9 mm. ...

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Abstract

The invention discloses a method for treating iron-bearing dust using a sintering process. The method includes the steps that lime suspension liquid is sprayed in dedusting ash, granulating is carriedout to obtain dedusting ash particles; the dedusting ash particles are added into a sintered mixture, and a sintered mixing material is obtained by mixing and granulating; and the sintered mixing material is distributed, sintered, broken, cooled and screened to prepare a sinter. According to the method for treating the iron-bearing dust using the sintering process, by spraying slaked lime suspension liquid on the surface of the dedusting ash with fine particle size and poor granulability, and the dedusting ash is agglomerated into dedusting ash small particles using viscosity and wettabilityof the slaked lime suspension liquid; the dedusting ash particles are added into the sintered mixture, after mixing and granulating, dedusting ash particles coated with iron ore powder on the externalare formed, separate combustion and mineralization are carried out in the sintering process, and influence of the dedusting ash particles on the composition of a sintered liquid phase is avoided; during the cooling process, the internal cooling speed of the particles is low, the bonding phase strength is improved advantageously, thus the sinter strength and average particle size are improved, low-temperature reduction pulverization of the sinter is obviously inhibited, and the quality of the sinter is obviously improved.

Description

technical field [0001] The application belongs to the technical field of ferrous metallurgy iron-containing dust solid waste treatment technology, and specifically relates to a method for treating iron-containing dust by using a sintering process. Background technique [0002] A large amount of dedusting dust (also called iron-containing dust) will be produced in the process of iron and steel metallurgy. These dedusting dusts contain some beneficial elements such as iron and carbon, and are usually sent to the sintering plant together with other mineral powders, fluxes, fuels, etc. as sintering raw materials use. However, due to the fine particle size, poor wettability, and high alkali metal content of these dust removal ash, it is not conducive to the granulation of the sintered mixture, which in turn reduces the air permeability of the sintering material layer, and the dust removal dust adhering to the surface of the particles is easy to be sucked into the smoke. Gas, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/16
CPCC22B1/16
Inventor 赵俊花马怀营高新洲潘文宋福亮贾国利张海滨申琪
Owner BEIJING SHOUGANG CO LTD
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