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Slurry Electrolysis of a Complex Polymetallic Sulfide Secondary Concentrate and Anodic Mechanism
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DOI：10.1007/s40831-026-01476-1.png)
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Abstract
En 中文
In this work, the slurry electrolysis (SE) of a complex polymetallic sulfide secondary concentrate (CPSSC) in the FeCl3-HCl-NaCl system and the anodic mechanism were investigated. The experimental results showed a significant increase in Cu extraction efficiency (e.g., 91.3% at 0.14 A and 85 degrees C in 11 h, saving 4-13 h, compared with the atmospheric leaching time in acidic ferric system) by using SE, increasing current/temperature, and decreasing particle content. Moreover, the HCl consumption was decreased. The proportions of contribution of direct electro-oxidation caused by CPSSC particle collisions with the anode, indirect electro-oxidation caused by FeCl3, indirect electro-oxidation induced by X2 (X = O and Cl), and chemical dissolution caused by H+ to Cu extraction at 0.14 A were 0.081 (or 0.119 at 0.03 A where no X2 evolved), 0.526, 0.315, and 0.078, respectively in 11 h, indicating weak direct collisions (although their proportions non-monotonically changed with time) and chemical dissolution. Moreover, the results confirmed that Fe3+ and X2 played key roles in Cu leaching. With increasing time/current, the role of X2 became prominent for leaching enhancement rather than the collision, although there was a synergistic effect between H+, Fe2+/Fe3+, and X2. The low anodic currents related to collisions before X2 evolution in linear sweep voltammetry curves without FeCl3 and the low proportions (0.032-0.100) determined from the collision kinetic analysis also verified such a weak direct collision electro-oxidation reaction. The products obtained after SE were S0-rich residues and cathodic high-purity Cu (96.6 at.%), verified by XRD and SEM-EDS.
Keywords:
Slurry electrolysis
Poor copper ore
Anodic mechanism
Direct collision
Indirect electro-oxidation
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3.2
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297
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