Sulfidation of heavy-metal-containing neutralization sludge using zinc leaching residue as the sulfur source for metal recovery and stabilization |
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| Affiliation: | 1. Institute of Environmental Science & Engineering, School of Metallurgy and Environment, Central South University, Changsha, Hunan 410083, China;2. Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Changsha, Hunan 410083, China;1. College of Mechanics, Shanxi Key Laboratory of Material Strength & Structural Impact, Taiyuan University of Technology, Taiyuan 030024, PR China;2. Research Center for Nano-Biomaterials, Analytical & Testing Center, Sichuan University, Chengdu 610064, PR China;3. Institute of Applied Mechanics & Biomedical Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China;1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;2. Chinese National Engineering Research Center for Control and Treatment of Heavy Metal Pollution, Changsha 410083, China;1. Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning 110016, PR China;2. Department of Geological Sciences, University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada;3. Illinois EPR Center, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;4. Canadian Light Source, University of Saskatchewan, Saskatoon, SK S7N 0X4, Canada |
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| Abstract: | Heavy-metal-containing neutralization sludge (NS) and sulfur-containing zinc leaching residue (ZLR), both of which are difficult to dispose of, are two of the main solid wastes produced in the Pb/Zn smelting process. This study focused on the application of ZLR as a sulfur source to sulfidize NS, which could then be separated by flotation for metal recovery. A mixture of NS, ZLR and additional sulfur was first mixed by ball milling, and then successively treated by hydrothermal sulfidation and flotation. Based on the chemical properties of NS and ZLR, the effects of the mass ratio of NS-to-ZLR, the amount of sulfur and ball milling time on sulfidation and the floatability and stability of the sulfidation product were investigated. The sulfidation percentages of Zn and Pb were as high as 82.6% and 95.6%, respectively. Flotation tests revealed that Zn and Pb can be enriched with a concentrate grade of 21.3% Zn and 3.4% Pb. Toxicity characteristic leaching procedure (TCLP) results indicated that stabilization of NS and ZLR occurred after sulfidation. |
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| Keywords: | Neutralization sludge Zinc leaching residue Hydrothermal sulfidation Metal recovery Stabilization |
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