关键词: 电化学, 喷射床, 流态化, 电流效率, 传质

Abstract:

Constant current spouted bed particle electro-deposition method had been studied with simulated wastewater containing copper and nickel as the research object under different experimental conditions such as pH, current, temperature with N₂. experimental results showed that under the experiment conditions of pH 3 (first 210 min) and 4.5 (next 270 min), electrolyte concentration 1 g·L^-1, constant current 15 A, cathode particle size 1.8 mm, electrolyte temperature 25℃ with blowing N₂, the largest removal rate of Cu²⁺ was 99.88% and Ni²⁺ was 85.21% after 480 min. During the experiments, DO first rapid increased to the maximum, and then came down slowly. Blowing N₂ into electrolyte could significantly reduce the dissolved oxygen concentration, which could effectively inhibit deposited Cu and Ni once again return to dissolve and improve the removal rate of deposited metals. The replacement reaction between Ni and Cu²⁺ weakened, the corrosion rate of deposited copper while it was intensified for nickel. Thus, the electro-deposition of mixed copper and nickel showed a certain order, which suggested that the separate recycling of metals in wastewater was feasible with the spouted bed particle electro-deposition method under certain conditions.

Key words: electrochemistry, spouted bed, fluidization, current efficiency, mass transfer