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Tian Y.,Xian University of Architecture and Technology | Tian Y.,Key Laboratory of Gold and Resources of Shaanxi Province | Song Y.,Xian University of Architecture and Technology | Song Y.,Key Laboratory of Gold and Resources of Shaanxi Province | And 4 more authors.
Chinese Journal of Environmental Engineering | Year: 2015

The sorption properties, kinetic and thermodynamics behaviors of macroporous weak-base anion exchange resin L-300 for Fe(CN)64- and Fe(CN)63- as well as related parameters were studied. The results show that the L-300 resin has good ability for iron cyanocomplexes. The static saturated adsorptive capacity of Fe(II) and Fe(III) are 5.301 mg/mL and 8.585 mg/mL, respectively at 25℃. The sorption process accords with Lagergren-equation and the liquid film diffusion is the predominating step of the sorption process. The adsorption rate constants for Fe(II) and Fe(III) are 39.85 mL/(g·min) and 55.56 mL/(g·min), respectively, it indicates that adsorption rate of resin for Fe(III) is slightly larger than Fe(II). The sorption process obeys the Freundlich isotherm. The thermodynamic enthalpy changes of adsorption process are calculated as 11.65 kJ/mol and 11.81 kJ/mol, respectively. It indicates that sorption process is an endothermic process. ©, 2015, Science Press. All right reserved. Source


Zhou J.,Xian University of Architecture and Technology | Zhou J.,Key Laboratory of Gold and Resources of Shaanxi Province | Zhang H.,Xian University of Architecture and Technology | Wang L.,Xian University of Architecture and Technology | And 6 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2016

High copper bearing gold cyaniding tail solution was absorbed by D311 resin. The effect of adding amount of resin, adsorption time, temperature, and pH on the adsorption rate of the copper cyanide complex ions were investigated, as well as the adsorption characteristics from both thermodynamics and kinetics. The optimal condition of static adsorption was obtained. The results showed that the adsorption rate of copper cyanide complex ions was more than 98% by D311 resin adsorbing the leaching gold tail solution which was pretreated by copper sulfate under the following conditions: liquid-solid ratio (volume ratio of filtrate to resin) of 5:1, pH<9, room temperature and adsorption reaction time of 135 min. The adsorption process was in accord with Freundlich models and was a favorable adsorption. The controlling step of this adsorption speed was interacted by particle diffusion and chemical reaction. Adopting the pseudo-first-order kinetics model and the pseudo-second-order kinetics model to simulate the experimental data of adsorption kinetics, the results suggested that this process conformed to the pseudo-second-order kinetics model. The theoretical adsorption capacity was 12.6023 mg·ml-1, which was consistent with the equilibrium adsorption capacity measured. The adsorption rate constant was k=1.236×10-2 min-1. © Editorial Office of Chinese Journal of Rare Metals. All right reserved. Source


Zhou J.,Xian University of Architecture and Technology | Zhou J.,Key Laboratory of Gold and Resources of Shaanxi Province | Wang L.,Xian University of Architecture and Technology | Zhang H.,Xian University of Architecture and Technology | And 6 more authors.
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2015

For comprehensive recycling of cyanide wastewater, ion exchange resin method is considered as one of the most promising technologies. But for cyanide wastewater with iron of leaching gold, the resin deactivation problem resulting from the presence of iron ions would occur with direct application of this method. Mainly aiming at one gold smelter wastewater containing high copper and high iron cyanides, a new combining process of treating the wastewater was researched, which contained two-step precipitation with ZnSO4 and NaOH combined with A-21S resin adsorption. The results showed that the removal rate of iron ions could reach 100%, CNT - and Cu ion precipitation rate could reach more than 85%, when suitable amount of ZnSO4 was added to the iron cyanide wastewater. The precipitations were mainly Zn2[Fe(CN)6], Zn(CN)2 and ZnCu2(CN)4. And then adding suitable amount of NaOH to the filtrate after separation could make Cu and Zn ion precipitate quickly and the removal rates could reach 37.08% and 70.90%, respectively. The recovery rate of Au ion in wastewater was more than 96% by A-21S resin adsorbing the final separation filtrate under the following conditions: the liquid-solid ratio (volume ratio of filtrate to resin) of 100:3 and stirring for 75 min at room temperature. Using this recycling process, the ion contents of CNT -, Fe, Cu, Zn, Au in the final filtrate were decreased by 94.54%, 100%, 96.34%, 99.87%, 96.76%, respectively, compared with those in the raw wastewater. The final solution could be recycled to the cyanide gold leaching system. © Editorial Office of Chinese Journal of Rare Metals. All right reserved. Source

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