Abstract
Aiming at the problems of low cadmium removal efficiency in zinc replacement and poor pressing plate effect of cadmium residues in the latter stage of the process, a novel electrically enhanced replacement method for cadmium removal based on a pulsed electric field was proposed. Comparative experiments with different current types verified the superiority of pulse current in the cadmium removal process to other known methods. At 45 °C, anode current density of 20 A·m−2, cathode-to-anode area ratio of 1:3, pulse duty ratio of 1:4, and pulse frequency of 500 Hz, the cadmium removal efficiency reached 96.80% in three hours. Furthermore, electrochemical test results for anodic reaction illustrated that the rise in solution acidity and Cd2+ concentration accelerated the replacement of zinc to cadmium. Correspondingly, increases in temperature, Cd2+ concentration, and solution pH inhibited the dissolution of the precipitated cadmium.
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