The effects of mixtures of acid mist suppression reagents on zinc electrowinning from spent electrolyte solutions

A novel device for testing the mechanical behavior of metal electrodeposits during cathode stripping

“…The presence of organic impurities in the sulfate electrolyte during the electrowinning of zinc may significantly affect the current efficiency and the quality of the metal electrodeposited on the aluminum cathodes. Previous works, which focused on the effect of organic compounds, such as acid mist suppressants (Hosny, 1993;Mackinnon, 1994;Dhak et al, 2011), extractants (Mackinnon et al, 1980), surfactants added during pressure leaching (Mackinnon et al, 1988;Alfantazi and Dreisinger, 2003), flotation collectors, flocculant and lubricating oil (Majuste et al, 2015), have confirmed these negative effects. However, these previous works have described the effects of the organic compounds on the morphology and crystal structure of the metal product only.…”

Effect of organic impurities on the morphology and crystallographic texture of zinc electrodeposits

“…The presence of organic impurities in the sulfate electrolyte during the electrowinning of zinc may significantly affect the current efficiency and the quality of the metal electrodeposited on the aluminum cathodes. Previous works, which focused on the effect of organic compounds, such as acid mist suppressants (Hosny, 1993;Mackinnon, 1994;Dhak et al, 2011), extractants (Mackinnon et al, 1980), surfactants added during pressure leaching (Mackinnon et al, 1988;Alfantazi and Dreisinger, 2003), flotation collectors, flocculant and lubricating oil (Majuste et al, 2015), have confirmed these negative effects, which are typically discussed on the basis of the physical and chemical adsorption of organic molecules on the cathode surface and the reactivity of polar organic functional groups to the Zn 2+ ion. It is well-established that adsorption of organic molecules on the cathode surface may affect the electron transfer to zinc deposition (Eq.…”

“…Previous works (Mackinnon et al, 1980;Mackinnon et al, 1988;Hosny, 1993;Mackinnon, 1994;Alfantazi and Dreisinger, 2003;Dhak et al, 2011;Majuste et al, 2015) have also described the effects of the organic compounds on the morphology and crystal structure of the metal product only. What has not been clearly established yet is how the morphology and texture of the electrodeposit will affect its mechanical properties and, thus, the effectiveness of the stripping stage.…”

An environmentally friendly and high current efficiency acid mist inhibitor for zinc electrowinning

“…However, all these surfactants had a low current efficiency. Dhak [24]studied the influence of Dowfroth 250 (D) and Tennafroth 250 (T) with saponin (S) on the current efficiency and power consumption during the zinc electrodeposition process in industrial waste electrolyte solution. The results showed that the acid mist suppression efficiency can respectively reach 86.1% and 87.0% with the addition of D5+S5 and T5+S5 during zinc electrodeposition in industrial waste electrolyte solutions, at the expense of current efficiency and higher energy consumption.…”