Method for treating iron-bearing dust using sintering process

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...

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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.

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