Abstract
The effects of five commercially available foaming reagents (range of 0 to 25 ppm) namely Dowfroth 250, Saponin, Yucca, Licorice and Meta-Para Cresol on acid mist control, current efficiency, polarization behavior, and deposit morphology and orientation were investigated. The deposition was carried out using a bench scale electrolysis apparatus (cell volume 3 L) at 500 A/m-2 and 38 °C for 3 hours from Kidd Creek zinc electrolyte. The acid mist control capability of the various reagents was studied and compared by characterizing the foam layer generated during actual electrowinning conditions and by direct quantitative measurements of acid mist levels on top of the electrowinning cells. Within the range considered, the addition of these reagents reduced the current efficiency, refined the grain size of the deposit, and changed to preferred orientation of most of the deposits. Among the reagents tested, acid mist measurements indicated that Licorice and Dowfroth 250 were the best acid mist suppressant at emissions of 0.30 mg/m3 and 0.31 mg/m3 respectively while Yucca and MPC produced the most mist at 3.0 mg/m3 and 3.3 mg/m3 emission rates, respectively.
| Original language | British English |
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| Pages | 139-161 |
| Number of pages | 23 |
| State | Published - 1997 |
| Event | Proceedings of the 1997 TMS Annual Meeting - Orlando, FL, USA Duration: 10 Feb 1997 → 13 Feb 1997 |
Conference
| Conference | Proceedings of the 1997 TMS Annual Meeting |
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| City | Orlando, FL, USA |
| Period | 10/02/97 → 13/02/97 |