Mendeleyev University of Chemical Technology of Russia (Moscow, Russia):

E. N. Kuzin, Cand. Eng., Department of Environmental Engineering, e-mail: e.n.kuzin@mail.ru
N. E. Kruchinina, Dr. Eng., Head of Faculty of Biotechnology and Environmental Engineering, Head of Department of Environmental Engineering, e-mail: krutch@muctr.ru

The main directions of alternative use of scale, a metal-containing waste material from forging and pressing shops at metallurgical enterprises, were suggested and researched within the framework of this work. Scale composition from the processes of heat treatment and forging of steel components from forging and pressing shops at the machine- building plant in the Moscow region was examined. It was established that up to 99 % of scale is presented by magnetic phases of iron oxides, supposedly in the form of Fe3O4, and alloying components do not practically transit in scale. The technology of sulfuric acid and hydrochloric scale processing with obtain of coagulants is suggested for purification of waste water at galvanic sections or hydrochloric pickling solutions respectively. The technology of scale use as filtrating loading for the processes of purification and neutralization of chromium-containing waste water is proposed. Hugh reducing ability of scale as a reactant for purification of acidic waste water was established in the wide range of initial concentration values of chromium (VI) compounds. Possibility of scale use as Fe-containing additive for pyrometallurgical processing of quartzite-leucoxene, a large-capacity titanium-containing mineral waste, was examined. It was established that chemically active pseudobrookite is the final conversion product; it can be used as raw material for manufacture of wide spectrum of commercial products.

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