Study of Manganese and Phosphoric Acid on Dimensionally Stable Anodes During Zinc Electrowinning
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Bibliographic record
Abstract
ABSTRACT During zinc electrowinning, the manganese oxide covers the surfaces of the dimensionally stable anodes (DSA) and decreases their electrocatalytic performance. Phosphoric acid is added into the zinc electrolyte to complex the manganic ion and hence reduce its disproportionation to MnO 2 . In the investigation, electrochemical measurements were carried out to examine electrochemical behavior of DSA (Ti/IrO 2 –Ta 2 O 5 ) anode during zinc electrolysis at 48 mA.cm −2 and 39°C. It is observed that the anodic potentials of DSA anodes are much lower after 5 h polarization in the zinc electrolyte containing 35 mL.L −1 phosphoric acid at 39°C than that without phosphoric acid. Also, the current efficiencies increase after addition of phosphoric acid to the zinc electrolyte containing 9 g.L −1 Mn 2+ . Electrochemical noise and impedance measurements show that addition of 35 mL.L −1 H 3 PO 4 to the zinc electrolyte increases the corrosion resistances during polarization. Addition of phosphoric acid to the zinc electrolytic can increase the oxidation peak by cyclic voltammetry study and improve the electrocatalytic behavior of DSA anodes.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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