Journal
HYDROMETALLURGY
Volume 152, Issue -, Pages 107-112Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.hydromet.2014.12.014
Keywords
Calcium-coated sand; Copper sulfide; Crystallization; Fed-batch fluidized bed reactor; Sodium sulfide pentahydrate
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Funding
- Korea Ministry of Environment [2012001340002, GT-SWS-11-01-006-0]
- National Research Foundation of Korea - Korean Government (MSIP)
- Korea Environmental Industry & Technology Institute (KEITI) [GT-SWS-11-01-006-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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This work has assessed factors affecting crystallization of copper sulfide (CuS) under batch conditions and in fed-batch fluidized bed reactor (FBR) using calcium-coated sands as a seed material. Compared with using sodium sulfide nonahydrate as a sulfidation reagent, larger CuS crystals were produced from sodium sulfide pentahydrate, most likely because of the lower surface charge. Due to the partial oxidation of sulfide in the pentahydrate form, the optimum molar ratio of Cu2+ to S2- was found to be 1:2, higher than the theoretical ratio. Crystal growth and aggregation were further increased by using calcium ion as a cross-linker among the CuS fines (<100 nm), resulting in an additional 30% decrease in Cu2+ concentrations from the effluent of fed-batch FBR. The efficacy of CuS crystallization was also remarkably dependent on the operating factors, i.e., the resting height of the seed material and re-circulation rate. Under optimal conditions, >95% of the initial Cu2+ (100 mg Cu2+/L) was successfully transformed to CuS crystals within 120 min. The size and crystallinity of the star-shaped CuS crystals were confirmed by FEG-SEM and XRD analyses, respectively. Principal component analysis indicated that the resting height and the seed type were the primary parameters affecting CuS crystallization in the fed-batch FBR. (C) 2014 Elsevier B.V. All rights reserved.
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