Recovery and utilization of iron and carbon values from blast furnace flue dust

Abstract

Waste recycling in an integrated iron and steel plant is important with regard to environmental and economic considerations. However, recycling of the waste needs to be supported by metallurgical studies to reap the maximum economic benefit. In this article, a typical flue dust sample obtained from an Egyptian iron and steel company was characterised and the amenability of recovering iron and carbon values from it was investigated. Flotation was used to recover carbon values while magnetic separation was employed for recovering the iron. It was possible to recover about 99% of carbon values with an assay of 87% purity. Additionally, high intensity magnetic separation was adopted to recover a clean magnetic fraction with 79% recovery at an assay of 52% Fe.

A self-reduced intermediate product from iron and steel plants waste materials using a briquetting process

“…The Egyptian Iron and Steel Company generates a great deal of blast furnace flue dust (20000-30000 t year −1 ), a typical analysis of which shows that it contains 33·30% carbon and 27·20% Fe as estimated by Ahmed Yehia et al [26].…”

Off-gas Dust in an Experimental Blast Furnace

“…The major part of flue dust consisted of Ͻ0.5 mm particles and more than 85% was in the size range Ͻ0.250 mm. This shows that the upper particle size range of investigated flue dust samples in this study corresponded in magnitude 6,7) to samples collected from production blast furnaces. However, it is important to point out that the quality of raw material used and raw material handling before charging influences off-gas dust in different blast furnaces along with the different gas-cleaning equipment for separation of flue dust and sludge.…”

“…Characterization of flue dust from an Egyptian iron and steel company showed that about 74 wt% of the material was below a particle size of 210 mm. 6) Chemical analysis showed that carbon was found in the coarser sizes above 210 mm and iron in the finer sizes below 210 mm. Determination of particle size of flue dust from an Iranian blast furnace showed that almost all of the material was in the size range Ͻ210 mm.…”

Speciation of Iron, Zinc, Lead and Calcium in blast furnace top-gas filter dust by sequential leaching

“…The main constituents of the BF dedusting residues, Fe, C and Ca are of some value, which supports recycling, e.g. via the sinter plant [5,6]. However, some tramp elements, particularly Zn, are limited in the recycling stream, as they can cause operational problems in the BF.…”