Journal
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
Volume 116, Issue -, Pages 340-346Publisher
INST CHEMICAL ENGINEERS
DOI: 10.1016/j.psep.2018.02.017
Keywords
Copper; Metallurgical sludge; Sugarcane bagasse; Biosorption; Acid leaching
Categories
Funding
- National Natural Science Foundation of China [51574182, 51404172]
- Key Project of Chinese Ministry of Education [213024A]
- Program for Excellent Young Scientific and Technological Innovation Team of Hubei Provincial Department of Education, China [T201506]
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A novel combined acid leaching-biosorption process has been designed and applied to recover Cu from metallurgical sludge. Cu was firstly leached out and then selectively adsorbed from lixivium by using modified sugarcane bagasse (SCB) fixed-bed column. Leaching results by HNO3 showed that 96.9% Cu along with different leaching ratios of Mg, Ca, Zn, Fe, Cd, Pb, K and Cr were dissolved into the lixivium from the sludge. Three types of breakthrough curve including inversed-L (for Mg, Ca, Fe, K and Cr), overshoot (for Zn, Cd and Pb) and S type (for Cu) were observed when the pretreated lixivium passing through the column, and adsorption kinetic results showed that the amount of Cu, Zn, Cd, Pb, Mg, Ca, Fe, K and Cr adsorbed was 16.6, 1.03, 0.04, 0.01, 0.03, 0.01, 0.77, 0.018 and 0.001 mg g(-1), respectively. Adsorption mechanism illustrated that Cu was selectively adsorbed from the lixivium due to its strong coordination ability with amine groups on the sorbent surface and the corresponding substitution reaction (between Cu and the co-ions). Cu could be recycled and the modified sorbent could be used repeatedly after column regeneration. These combined method had great potential in application of Cu recovery from sludge. (C) 2018 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.
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