Title

STUDY ON THE OFF-GAS DUST IN BLAST FURNACE

STUDY ON THE OFF-GAS DUST IN BLAST FURNACE

Authorship

Jian, Sun; Wei, Chao; Xiaoming, Zhang; Zejun., Ma

Jian, Sun

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Wei, Chao

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Xiaoming, Zhang

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Zejun., Ma

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DOI

10.5151/2594-357X-22303

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Abstract

It is the general trend in steel industry that more big-scale blast furnaces were chosen in iron making. As the blast furnace is larger, the demand of the raw material strength is more. For a stable operation and the low loss of raw materials, it is important to understand the composition and characteristics of the off-gas dust. Characterization using Laser Particle Size Distribution Device, Scanning Electron Microscope and Optical Microscope were focused on the gravity dust, cyclone dust, bag-type dust formed by Qiangang 3# blast furnace. The result showed that the median diameter of the gravity dust, Cyclone dust and Bag-type dust was 140 μm, 75 μm and 5.5 μm. The iron content of the three dust samples was about 30%, while the carbon content was quite different, which was about 34% in gravity dust, 30% in Cyclone dust, 20% in Bag-type dust. Major of the carbon-containing particles in the off-gas dust were from the coke, and only a few were from the coal.

It is the general trend in steel industry that more big-scale blast furnaces were chosen in iron making. As the blast furnace is larger, the demand of the raw material strength is more. For a stable operation and the low loss of raw materials, it is important to understand the composition and characteristics of the off-gas dust. Characterization using Laser Particle Size Distribution Device, Scanning Electron Microscope and Optical Microscope were focused on the gravity dust, cyclone dust, bag-type dust formed by Qiangang 3# blast furnace. The result showed that the median diameter of the gravity dust, Cyclone dust and Bag-type dust was 140 μm, 75 μm and 5.5 μm. The iron content of the three dust samples was about 30%, while the carbon content was quite different, which was about 34% in gravity dust, 30% in Cyclone dust, 20% in Bag-type dust. Major of the carbon-containing particles in the off-gas dust were from the coke, and only a few were from the coal.

Keywords

Particle size distribution; Off-gas dust; Gravity dust; Cyclone dust; Bagtype dust.

Particle size distribution; Off-gas dust; Gravity dust; Cyclone dust; Bagtype dust.