Emission of heavy metals from black metal forging production waste

Abstract

© 2019, Institute of Advanced Scientific Research, Inc. All rights reserved. Most of the waste resulting from ferrous metals processing, namely, iron oxide, is of limited use and is located in places of temporary or permanent storage. The possibility of using iron oxide as an additive to building materials can be limited by the level of mobile ingredients emission into the aqueous phase, causing pollution of environmental objects. These include heavy metal ions. The negative impact of iron oxide on the environment was assessed by measuring the content of heavy metal ions in aqueous and ammonium acetate extracts, for which the atomic emission spectroscopy method was used. In total, the presence in certain or trace amounts of 23 compounds of elements attributable to heavy metals, as well as B, Se, Tl, was found in extracts. Six priority heavy metals from iron oxide for water extraction and ammonium acetate buffer are arranged in rows in the order of decreasing concentration ratios: a) For aqueous extracts-Fe, Ni, Cu, Zn, Al, Mn; b) For ammonium acetate extraction-Fe, Ni, Mn, Zn, Cu, Cr. The fact that those figures exceed in some cases the normative indicators for commercial fishery water bodies and wastewaters makes it necessary to wash iron scale with water before its use as an additive in building mixtures.