Abstract
Effects of additives on zinc electrowinning from zinc sulphate aqueous solution with a higher concentration fluoride (300mgL−1) have been investigated based on the measurements of polarization curves (PC), cyclic voltammetry (the working electrode was made from pure aluminum, a graphite rod was used as counter and a saturated calomel electrode (SCE) as the reference electrode) and zinc electrodeposition experiments, in which gelatin, boric acid, citric acid and aluminum sulfate served as additives and were added into the electrolytes alone or in combination with different dosages. Zinc deposit morphology on aluminum cathode surface after zinc electrowinning was observed using SEM (scanning electron microscopy). The results indicated that all additives within a certain concentration scope increased nucleation overpotential, stimulated cathodic polarization and promoted electrodepositing with fine-grained zinc. The nucleation overpotential increased from 124mV to 183mV in addition of 5mgL−1. Finer-grained zinc deposits, lower specific power consumption (maximum reduction from 3129 kWht−1 to 2192 kWht−1) and higher current efficiency (86.2% to 96.2%) were available by these additives combination.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
