Interfacial effects of surface-active agents under zinc pressure leach conditions

Owusu, George; Dreisinger, David; Peters, E.

doi:10.1007/bf02648972

Cited by 14 publications

(7 citation statements)

References 7 publications

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“…Значения ξ + r1 и ξ′ r3 определяются решением системы уравнений ( 10), ( 14), ( 15), ( 16), а ξ′ r1 и ξ′ r2 -по формулам ( 20), (21). концентрации Zn 2+ , в 4 раза большему, чем реакция r2, то в последней окислитель расходуется менее эффективно, т.е.…”

Section: методика термодинамических исследованийunclassified

“…За прошедшие десятилетия был накоплен большой опыт реализации АОВ цинковых концентратов [3,6], получены данные о кинетике процесса, влиянии состава концентратов [7][8][9][10][11][12][13][14][15][16][17][18][19] и добавок на эффективность выщелачивания [20,21].…”

Section: Introductionunclassified

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Thermodynamic analysis of zinc sulfide dissolution stoichiometry in sulfuric acid solution with oxygen

Solovyeva

Kolmachikhina

Mamyachenkov

2020

Izv.VUZ. Tsvet. Met.

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A thermodynamic study of zinc sulfide high temperature oxidation leaching was conducted. Several processes can run simultaneously while metal sulfides are dissolved by oxidants in acidic solutions. Thermodynamic calculations were made using stoichiometric equations with equal oxidant consumption in order to identify the proportion of potential reactions. Moreover, stoichiometric coefficients were chosen in such a way as to reagents could exchange 1 mole of electric charge. This approach ensures a comparison of different oxidants in terms of their effectiveness in sulfides leaching. Thermodynamic analysis results obtained agree with experimental data confirming that oxidizing reactions with the formation of sulfur and sulfate ions prevail in zinc sulfide dissolution in sulfuric acid solutions under the oxygen effect. The effect of oxygen consumption and initial sulfuric acid concentration on the proportion of these reactions and equilibrium concentration of zinc cations in the solution was studied. Thermodynamic analysis showed that if the acid concentration is insufficient and limits the maximum progress of zinc sulfide oxidation with sulfur formation, oxygen is also consumed for the oxidation reaction with the formation of sulfate ions spending oxygen less effective due to 4 times less zinc cations passing to the solution. Thermodynamic calculations made it possible to find out the optimal proportions of oxygen consumption and initial sulfuric acid concentration to achieve the maximum zinc equilibrium concentration in the solution with more effective oxidant consumption without any labor-intensive experiments. The equilibrium concentration of zinc cations in the solution is in direct proportion to the initial acid concentration, and zinc cation formation is in direct proportion to oxygen consumption at the optimal acid concentration.

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Section: методика термодинамических исследованийunclassified

Section: Introductionunclassified

Thermodynamic analysis of zinc sulfide dissolution stoichiometry in sulfuric acid solution with oxygen

Solovyeva

Kolmachikhina

Mamyachenkov

2020

Izv.VUZ. Tsvet. Met.

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“…Establishing the cause of the insufficient effectiveness of LS and the development of new highly effective surfactants and formulations of multicomponent surfactant compositions are constrained by the lack of data on interfacial phenomena, namely, the processes of adsorption, wetting, and dispersion of minerals with the participation of surfactants under conditions simulating the autoclave leaching of ores. It should be emphasized that targeted studies of surface phenomena at the mineral–elemental sulfur–surfactant boundary, carried out by Naboychenko, Goryachkin, Shneyerson, Owusu, Dreisinger, and Naftal ,− have certainly significantly advanced our understanding of the mechanisms of implementation of the surface effect of surfactants. Meanwhile, a number of issues remain which require practical verification and theoretical substantiation, in particular, the effect of the ionic composition of the liquid phase on the processes of wetting and adsorption of minerals and elemental sulfur has not been studied.…”

Section: Introductionmentioning

confidence: 99%

Surface Phenomena with the Participation of Sulfite Lignin under Pressure Leaching of Sulfide Materials

Lugovitskaya

Rogozhnikov

2023

Langmuir

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Searching for surfactants which can eliminate the occluding effect of molten elemental sulfur formed in the process of leaching sulfide ores under pressure (autoclave leaching) is relevant. However, the choice and use of surfactants are complicated by the harsh conditions of the autoclave process, as well as the insufficient knowledge of surface phenomena in their presence. This paper presents a comprehensive study of interfacial phenomena (adsorption, wetting, and dispersion) involving surfactants (using lignosulfonates as an example) and zinc sulfide/concentrate/elemental sulfur under conditions simulating sulfuric acid leaching of ores under pressure. The influence of concentration (C LS 0.1−1.28 g/dm 3 ), features of the molecular weight (M̅ w , 9.250−46.300 Da) composition of lignosulfates, temperature (10−80 °C), addition of sulfuric acid (CH 2 SO 4 0.2−10.0 g/dm 3 ), and properties of solid-phase objects (surface charge, specific surface area, presence and diameter of pores) on surface phenomena at the liquid−gas and liquid−solid interfaces was revealed. It was found that with an increase in molecular weight and a decrease in the degree of sulfonation, the surface activity of lignosulfonates at the liquid−gas interface, as well as their wetting and dispersing activity with respect to zinc sulfide/concentrate increases. It has been found that an increase in temperature contributes to the compaction of the macromolecule of lignosulfonates, as a result of which their adsorption at the liquid−gas and liquid−solid interface in neutral media rises. It has been shown that the introduction of sulfuric acid into aqueous solutions increases the wetting, adsorption, and dispersing activity of lignosulfonates with respect to zinc sulfide. The latter is accompanied by a decrease in the contact angle θ (by 10 and 40°) and an increase in both the specific number of zinc sulfide particles (not less than 1.3−1.8 times) and the content of fractions with a size of −3.5 μm. It has been established that the functional effect of lignosulfonates under conditions simulating sulfuric acid autoclave leaching of ores is implemented through the adsorption−wedging mechanism.

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“…В гидрометаллургии довольно часто используют органические реагенты и поверхностноактивные вещества (ПАВ), например при электролизе для создания плотной пены на поверхности ванны [1,2] или для получения порошков заданной крупности [3][4][5][6][7]. При автоклавной переработке сульфидного цинкового сырья ПАВ также часто применяются для снижения смачиваемости минералов расплавленной серой, образующейся в процессе выщелачивания [8][9][10]. Ряд работ [11][12][13] свидетельствуют об ухудшении показателей гидролитической очистки от железа, цементационной очистки от меди, никеля и кобальта из растворов после автоклавного выщелачивания в присутствии высоких количеств лигносульфонатов.…”

Section: Introductionunclassified

Study into the effect of sodium lignosulfonate, anionic surfactants and their mixtures on the rate of copper ion cementation by zinc

Kolmachikhina

Sviridov

Naumov

2020

Izv.VUZ. Tsvet. Met.

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The article focuses on the effect of sodium lignosulfonate (LS), anionic surfactants (sodium dodecylsulfate (SDS), sodium dodecylbenzene sulfonate (SDBS)), and their mixtures on the rate of copper cementation by zinc. The results obtained demonstrate a decrease in copper cementation rate with the increasing LS and SDBS concentrations. There was also excessive zinc consumption for copper ion cementation noted due to LS and SDBS anion adsorption on positively charged zinc cathodic areas of the cementing agent and the precipitate. This led to a decrease in the rate of copper particle nucleation, energy consumption for forming new copper nucleation centers, and conditions for hydrogen overpotential reduction. In addition, rising temperature led to a decrease in zinc consumption in the presence of LS. Surfactants under investigation may be ranked by the negative impact on copper ion cementation in an ascending order as follows: SDS < SDBS < LS. LS + SDS mixture testing showed its irregular effect on copper cementation rate at test temperatures. Experiments with LS and SDBS mixtures demonstrated a linear decrease in copper ion cementation rate with increasing SDBS concentration and simultaneously rising zinc consumption. Due to the negative impact of investigated reagents discovered, we proposed a method for removing organic impurities from solutions using multilayered aluminosilicates modified by cationic surfactants. The results obtained indicate the high effectiveness of organic impurity removal from solutions providing for a 50 % increase in cementation rate in the presence of LS + SDBS mixture together with a decrease in zinc consumption.

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Interfacial effects of surface-active agents under zinc pressure leach conditions

Cited by 14 publications

References 7 publications

Thermodynamic analysis of zinc sulfide dissolution stoichiometry in sulfuric acid solution with oxygen

Thermodynamic analysis of zinc sulfide dissolution stoichiometry in sulfuric acid solution with oxygen

Surface Phenomena with the Participation of Sulfite Lignin under Pressure Leaching of Sulfide Materials

Study into the effect of sodium lignosulfonate, anionic surfactants and their mixtures on the rate of copper ion cementation by zinc

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