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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 flotation process is presented and the work carried out to find optimum conditions to minimise the colouring material in ground calcium carbonate is described. The feed material is the overflow product from a hydrocyclone, which results from using a Denver attritioning machine with semiautogenous grinding for 1 h at 1:1 ore/water ratio. By using sodium silicate as deprassant and oleic acid as collector with pH 9, the iron content (as colouring material impurities) is decreased from ,0 . 9 in the original sample to ,0 . 45 in the rougher concentrate. However, by cleaning the rougher concentrate, the iron content is decreased to 0 . 26%.

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