Empress Catherine II St. Petersburg Mining University, St. Petersburg, Russia

N. V. Dzhevaga, Cand. Chem., Associate Prof., Dept. of Geoecology, e-mail: dzhevaga331@mail.ru
O. L. Lobacheva, Cand. Chem., Associate Prof., Dept. of General and Physical Chemistry

The article considers the issue of anthropogenic load on environment, related to the generation and utilisation of open-hearth slag at the metallurgical factory in Saint-Petersburg. The estimation of environment by slags has been carried out; the treatment of waste at the factory under consideration is recognized as a topical issue. The chemical composition of slags has been done on the example of open-hearth slags; the calculation of the waste's hazard category has been fulfilled. According to chemical analysis data, aluminum oxides, silicon oxides, iron oxides, manganese oxides, calcium oxides and iron predominate in the composition of the slag. The authors suggest granulation of open-hearth slag as an unconventional way of slag processing of the factory in question and, as a consequence, lowering of environmental load. The necessity of correct selection of granulated slag parameters for its further implementation is noted. For this, a granulation equipment is proposed, the dimensions of which allow it to be installed directly near the furnaces. The economic effect of a suggested alternative way to process wastes at the metallurgical manufacture has been estimated. The outcomes of research show that metallurgical slag granulation is an effective and environmentally safe way of industrial wastes' utilisation, and it can result in economic benefit for the benefit enterprise. Granulated open-hearth slag can be used as building material, road carpet and in cement making.

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