Abstract
A novel process for recovery of tellurium (Te) from alkaline solution by cyclone electrowinning was proposed. The electrochemical behavior of Te in alkaline media was determined by cyclic voltammetry and linear sweep voltammetry measurements. It indicated that TeO32− ion was first reduced to Te(s), then to Te22− ion. It has been identified that Te electrodeposition was diffusion and charge transfer controlled irreversible reaction. The influences of Te concentration, NaOH concentration, flow rate of the electrolyte, current density and cathode material on Te cyclone electrowinning were systematically investigated. The current efficiency of 95.25% and energy consumption of 1737.59 kWh·t−1 was achieved from the electrolytes containing 100 g·L−1 Te and 100 g·L−1 NaOH at 300 L·h−1 flow rate of the electrolyte and 100 A·m−2 current density, 316 L stainless steel cathode. Te deposits with a purity of 99.94% was obtained.
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