2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 11: Recycling & Environmental
| Editors: | Kongoli F, Havlik T, Pagnanelli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 410 pages |
| ISBN: | 978-1-987820-34-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Leaching of Hexavalent Chromium from Stainless Steelmaking Slags and the pH Influence on the Chromium Mobility
Luiza Bonin1; Fabienne Delaunois2; Veronique Vitry2;1UNIVERSITE DE MONS, Mons, Russian Federation; 2UNIVERSITE DE MONS, Mons, Belgium;
Type of Paper: Regular
Id Paper: 96
Topic: 10
Abstract:
Stainless steelmaking slags are suitable for application in road construction. However, it exists environmental concerns regarding the utilization and landfilling of stainless steel slag by virtue of the presence of heavy metals and especially to the leachable quantities of hexavalent chromium. Hexavalent chromium has been identified as a priority pollutant by Environmental Protection Agency (US EPA) as a result of its carcinogenicity, toxicity and mutagenicity. Leaching tests are used to help to quantify toxic inputs due to mobilization of contaminants and the pH is one of the main parameters that helps to determine heavy metal mobility of waste materials. This paper discusses the use of pH leaching tests (Method 1313 US EPA) as a tool to assess the potential mobilization of trivalent and hexavalent chromium from stainless steelmaking slags. The method consists of parallel batch extractions of solid material, each one with an aliquot of either dilute acid or base. The total chromium concentration of the leach solutions was measured by inductively couple plasma optical emissions spectrometry (ICP-OES) and the hexavalent chromium concentration was measured by ultraviolet-visible (UV-vis) spectroscopy.
Keywords:
Environment; Metallurgical; Waste;References:
[1] H. Motz, J. Geiseler. Products of steel slags an opportunity to save natural resources. Waste Management. 21, 2001, 285-293.[2] Mandiwana, Khakhathi L. Rapid leaching of Cr(VI) in soil with Na3PO4 in the determination of hexavalent chromium by electrothermal atomic absorption spectrometry. Talanta. 74, 2008, 736–740.
[3] Krejpcio, Z. Essentiality of Chromium for Human Nutrition and Health. Polish Journal of Environmental Studies. 6, 2001, Vol. 10, 399-404.
[4] J. Kotas, Z. Stasicka. Chromium occurrence in the environment and methods of its speciation. Environmental Pollution. 107, 2000, 263- 283.
[5] Kanokwan Komonweeraket, Bora Cetin, Ahmet H. Aydilek , Craig H. Benson , Tuncer B. Edil. Effects of pH on the leaching mechanisms of elements from fly ash mixed soils. Fuel. 140, 2015, 788-802.
[6] Method 1313, Liquid-solid partitioning as a function of extract pH using a parallel batch extraction procedure. USEPA. Washington, USA, 2012.