Journal
MINERALS ENGINEERING
Volume 25, Issue 1, Pages 14-19Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2011.09.014
Keywords
Sulfidation treatment; Heavy-metal-containing sludge; Zinc sulfide; Stabilization; Flotation
Funding
- China National Funds for Distinguished Young Scientists [50925417]
- Key Project of Science and Technology of Hunan province [2009FJ1008]
- National High Technology research and Development Program of China [2010AA065203]
- Program for New Century Excellent Talents in University [ncet-10-0840]
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The conventional lime-neutralization process generates a huge volume of neutralization sludge (NS). The disposal of NS is difficult because it contains large amounts of heavy metals, moisture and complex components. The present study describes the application of hydrothermal sulfidation (HS) toward the conversion of certain heavy metals (mainly zinc) in NS to metal sulfide (MeS) for subsequent metal recovery through flotation. The effects of temperature, time, sulfur concentration and liquid-to-solid ratios were investigated under laboratory conditions. The extent of zinc sulfidation was up to 85% under optimal conditions. Flotation tests indicated that the ZnS produced could be separated from the NS, increasing the recovered Zn concentration from 19.9% to 38.8%. The toxicity characteristic leaching procedure (TCLP) revealed that stabilization and detoxification of heavy metals occurred during sulfidation. The formation of metal sulfide by HS enhanced the stabilization effect. Moreover, flotation technology provided a means to enhance metal recovery from the NS. (C) 2011 Elsevier Ltd. All rights reserved.
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