Effect of recycling blast furnace flue dust as pellets on the sintering performance

N.A El-Hussiny,M.E.H Shalabi

doi:10.2298/sos1003269e

N.A El-Hussiny, M.E.H Shalabi

Open Access

https://doi.org/10.2298/sos1003269e

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Abstract

The Egyptian Iron and Steel Company generates a great amount of blast furnace flue dust. The recovery of metals and carbon from this flue dust becomes a very important demand due to the increase of the price of coke breeze and the decrease of the primary source of metals. At the same time, it make the environment more safe by decreasing pollution. Introducing these dust fines in the sintering process proves to be very harmful for different operating parameters. Thus, this study aims at investigating the production of pellets resulting from these fines, using molasses as organic binder and its application in sintering of iron ore. The sintering experiments were performed using flue dust as pellets as a substitute of coke breeze. The results revealed that, sintering properties such as inter strength increases with using the flue dust pellets, while productivity of both the sinter machine and sinter machine at blast furnace yard decreases. Also the vertical velocity of the sinter machine and the weight loss during the reduction of produced the sinter by hydrogen decrease.

Highlights

Production processes in iron and steel industry involve the formation of large amounts of by-products
This is due to the increase of the viscosity of liquid with increasing the amount of molasses dissolved in water
The most suitable pellets (2.8 - 7 mm) of blast furnace flue dust fines are produced in disc pelletizer at angle of inclination 60 o, disc rotating speed 17 rpm and residence time of pellets on pelletizer 10 min

Summary

Introduction

Production processes in iron and steel industry involve the formation of large amounts of by-products. These by products cause large volumes of waste streams. Methods ranging from simple agglomeration techniques to new hot metal production processes for treating the dust materials to recycling in iron and steel making operations. These processes involve thermal, hydrometallurgical and physical beneficiation methods [3]. Binders are important for holding the fine particles together during the pelletization process. Organic binders burn or volatilize during movement of the flame front.

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