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Recycling of steel and foundry fly ash in electric arc furnaces and cupola furnaces

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Production of steel and cast iron in metallurgical units generates fly ashes. These fly ashes represent dangerous waste, which is not recycled in metallurgical plants and which is only dumped to disposal sites. This procedure is financially highly disadvantageous for producers. One of possibilities of partial processing consists in retrogressive recycling in charge of primary metallurgical units. The paper presents some operational results of compressed fly ashes from steelmaking plants and foundries. Operation tests were realised for verification of behaviour and efficiency of processing. They were focused on behaviour of fly ashes in the course of production of steel and cast iron and on their influence on technological process. The obtained results were verified by comparison with results of heats, into which no fly ashes were added. W procesie produkcji stali i żeliwa w agregatach metalurgicznych powstają pyły unoszone wraz z gazami poreakcyjnymi. Te pyły stanowią niebezpieczny odpad, który nie jest w zakładach metalurgicznych recyklingowany lecz często jest tylko deponowany. Taka procedura jest dla producenta finansowo bardzo niewygodna. Jedną z możliwości częściowego przetwarzania jest powrotny recykling do wsadu podstawowych agregatów metalurgicznych. Przedstawiono niektóre wyniki recyklingu prasowanych pyłów stalowniczych i odlewniczych. W celu sprawdzenia możliwości wykorzystania tych pyłów przeprowadzono badania, które miały na celu wyjaśnienie zachowania się pyłu przy produkcj[...]

Influence of flowing of steel in ceramic filter on efficiency of filtration

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The paper describes results of investigation of influence of type of steel flow on efficiency of its filtration. Four series of experiments were realized in laboratory conditions, during which the filtered steel was deoxidized by aluminium, as well as by silicon and manganese. two types of strainer ceramic filters were used for filtration, and flowing molten steel had different values of reynold[...]

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