Study on Mass Transfer Enhancement of Mercury Electroreduction Recovery in a Flow Electrolytic Cell
Hydrometallurgical electrochemical recovery technology offers a green pathway for mercury resource utilization,but its application faces challenges such as low reduction recovery efficiency caused by mass transfer limitations.To address this,a novel platform for mercury electroreduction based on flow electrolytic cells was developed to enhance mass transfer.The mercury recovery efficiency of the flow electrolytic cell reached 87.26％,representing a 50.16％improvement compared to the H-type electrolytic cell,with a reaction kinetic constant k 4.6 times higher than that of the static mode.Under optimal conditions,an electrolyte flow rate of 5 mL/min,an temperature of 30 ℃,and a reduction potential of-1.5 V,the system achieved a maximum Faradaic efficiency of 78.29％,a mercury reduction yield of 9.91 mg/(h·cm2),and a product purity exceeding 97％.Simulation of the flow field indicated that the flow electrolytic process reduces the diffusion layer thickness,shortens the migration distance of Hg2+,and accelerates the surface renewal of Hg2+,enhancing electroreduction recovery of mercury.
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