DAOUSH Walid Central Metallurgical Research & Development Institute

Spoluautoři HALFA Hossam

In the present work, a ferrochrome powder scrap was used for preparing fine chromium powder by leaching process in hydrochloric acid. On the other hand, the remaining iron chloride was used for produce magnetite powder by thermal decomposition of organo-metallic compound of iron chloride with EDTA. Particle size and magnetic properties of prepared chromium and magnetite powders as well as the starting ferrochrome were studied. Chemical composition and structure of prepared chromium and magnetite powders as well as the starting ferrochrome were determined and evaluated. The experimental results show that, the prepared chromium powder has acicular particle shape with around 20 µm particle size. On the other hand prepared magnetite powder has spherical like particle shape with around 2-5 um particle size. The results of the magnetic measurements show that, the starting ferrochrome scrap powder has a ferromagnetic property with a saturation induction 6.5 emu/g but the produced chromium powder has a non-magnetic property with a magnetic permeability 1.1. On the other-hand the prepared magnetite has a ferromagnetic property with a saturation induction value of 86 emu/g. The magnetite properties investigations were carried out for the prepared powder and the related ferroalloys before and after leaching. From the results of the magnetic measurements, the starting ferrochrome scrap powder has a ferromagnetic property with a saturation induction 6.5 emu/g but the produced chromium powder has a non-magnetic property with a magnetic permeability 1.1. On the other-hand the prepared magnetite has a ferromagnetic property with a saturation induction value of 86 emu/g.

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