Title
Valorization of stainless steel slag by selective chromium recovery and subsequent carbonation of the matrix material Valorization of stainless steel slag by selective chromium recovery and subsequent carbonation of the matrix material
Author
Faculty/Department
Faculty of Sciences. Bioscience Engineering
Publication type
article
Publication
Science citation index ,
Subject
Chemistry
Biology
Source (journal)
Journal of cleaner production / Masson. - Science citation index
Volume/pages
117(2016) , p. 221-228
ISSN
0959-6526
ISI
000371552200025
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
This study focuses on the recycling of stainless steel (SS) slags containing about 1.2 wt% of chromium (Cr). The selective recovery of Cr from SS slag by a hydrometallurgical method (alkaline pressure leaching) was investigated. Leaching experiments were carried out based on 2(4-1) factorial design of experiment (DOE) with the following parameters: NaOH concentration, temperature, leaching time, and mechanical activation (MA). Results show that temperature and MA are the most influencing factors for an enhanced Cr leaching. The maximum Cr leaching was 46% at 1 M NaOH, 240 degrees C, 6 h, MA 30 min, while the matrix material was dissolved only to a limited extent (Al 2.88%, Si 0.12%, Ca 0.05%). After Cr leaching followed by alkali washing, a carbonation treatment is proposed to stabilize the remaining Cr in the matrix material and make the subsequent recycling of the matrix material as a construction material possible. (C) 2016 Elsevier Ltd. All rights reserved.
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