Selective leaching of zinc from hazardous As-bearing zinc plant purification filter cake

Behnajady, Bahram; Moghaddam, Javad

doi:10.1016/j.cherd.2016.11.019

Cited by 22 publications

(9 citation statements)

References 31 publications

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“…4 are not sufficient to directly describe the effect of the studied parameters on the recovery process. Therefore, many scientists were used Analysis of Variance (ANOVA) approach to define which investigated parameters are predominant on the performance characteristics (Mbuya et al 2017;Behnajady and Moghaddam 2017). For this reason, the F test was used to specify which process parameters had a significant effect on the leach efficiency.…”

Section: Leaching Resultsmentioning

confidence: 99%

“…But Taguchi is insufficient of identifying which factor has influenced the output significantly and how much each factor contributed to the output. Therefore, analysis of variance (ANOVA) in accordance with the Taguchi method was done to determine which investigated parameters are dominant on the leaching performance (Mbuya et al 2017;Behnajady and Moghaddam 2017). For this reason, the F test was used to specify which process parameters had a significant effect on the leach efficiency.…”

Section: Optimization Methodsmentioning

confidence: 99%

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Investigation of an alternative chemical agent to recover valuable metals from anode slime

Rüşen

Topçu

2018

Chem. Pap.

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Anode slime (AS) including high content of precious metals is a by-product obtained after the electro-refining stage in copper production. In this study, it is aimed to recover Cu, Au, and Ag from the AS by using 1-butyl-3-methyl-imidazolium hydrogen sulphate ([Bmim]HSO 4) ionic liquid (IL) as a green solvent. The effects of IL concentration, temperature, reaction time and pulp density on recovery of valuable metals were statistically investigated. A high copper recovery of 87.52% was obtained under optimum condition as in 60% (v/v) [Bmim]HSO 4 at 50 °C after 2 h, pulp density at 40 g/L (1/25 solid/liquid ratio). Also, a remarkable gold recovery as 97.32% has been achieved in 80% (v/v) [Bmim]HSO 4 at 95 °C after 4 h, pulp density at 40 g/L. Temperature and IL concentration were detected as the most effective parameters for copper and gold recovery from AS, respectively. Silver could not be recovered from the AS due to the lower solubility in [Bmim]HSO 4 IL media. According to experimental results, [Bmim]HSO 4 could be offered as an alternative leaching agent, instead of conventional solvents, to recover valuable metals from copper anode slime.

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Section: Leaching Resultsmentioning

confidence: 99%

Section: Optimization Methodsmentioning

confidence: 99%

Investigation of an alternative chemical agent to recover valuable metals from anode slime

Rüşen

Topçu

2018

Chem. Pap.

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“…The optimum HCl concentration for leaching of Zn with minimum Fe dissolution was 1.2 mol/L, corresponding to a solution pH of 4.9 (data not shown). These results suggest that the pH of the leaching solution can be used as a process control factor to facilitate the leaching of Zn without Fe, irrespective of the type of acid used and the properties of the EAFDs [19][20][21]. In particular, Behnajady and Moghaddam [19], who studied the effects of various parameters (temperature, reaction time, L/S ratio, stirring speed, and pH) on the extraction of metals from a Zn plant hot purification filter cake, reported that the pH had the strongest effect on the selective leaching of Zn.…”

Section: Effect Of Acid Leaching Time and L/s Ratio On Ph And Metal Lmentioning

confidence: 91%

“…These results suggest that the pH of the leaching solution can be used as a process control factor to facilitate the leaching of Zn without Fe, irrespective of the type of acid used and the properties of the EAFDs [19][20][21]. In particular, Behnajady and Moghaddam [19], who studied the effects of various parameters (temperature, reaction time, L/S ratio, stirring speed, and pH) on the extraction of metals from a Zn plant hot purification filter cake, reported that the pH had the strongest effect on the selective leaching of Zn. On the other hand, the concentrations of lead and cadmium in the acid leaching solution of EAFD 1-4 were very low (0.3-0.7 mg/L and ND (not detected)-0.3 mg/L, respectively, as determined by ICP-MS), and the metals remaining in solution could be removed by subsequent Zn refining, which is commonly performed by reductive precipitation using Zn powder [6].…”

Section: Effect Of Acid Leaching Time and L/s Ratio On Ph And Metal Lmentioning

confidence: 91%

Toward high recovery and selective leaching of zinc from electric arc furnace dust with different physicochemical properties

Lee

Park

Hwang

et al. 2019

Environmental Engineering Research

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This work describes highly efficient recovery and selective leaching of Zn from electric arc furnace dust (EAFD) with different physicochemical properties, induced by acid leaching at ambient conditions. The chemical compositions, mineralogical phases, and particle sizes of the EAFDs were analyzed and compared. The effects of leaching time, liquid/solid ratio, acid type, and acid concentration on the selective leaching of Zn were also studied. The EAFD with high Fe/Zn ratio (>1, EAFD 3) was richer in ZnFe 2 O 4 and exhibited larger particle size than samples with low Fe/Zn ratio (<1, EAFD 1,2). ANOVA analysis revealed that the Fe/Zn ratios of the EAFDs also have a significant effect on Zn extraction (p <0.005). Selective leaching of Zn with minimum Fe dissolution was obtained at pH >4.5, regardless of other parameters or sample properties. The maximum Zn extraction rate obtained by the pH control was over 97% for EAFD 1 and EAFD 2 , 76% for EAFD 3 , and 80% for EAFD 4. The present results confirm that the Fe/Zn ratio can be used to identify EAFDs that permits facile and high-yield Zn recovery, and pH can be used as a process control factor for selective leaching of Zn regardless of any differences in the properties of the EAFD sample.

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“…Statistics and statistical methods play an important role in planning, conducting, analysing and interpreting data obtained from experimental determinations. When more variables influence a particular feature of a process, the best strategy is to design an experiment so that it can draw reliable and cost-effective conclusions at the end of the process [22][23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Platinum (IV) Recovery from Waste Solutions by Adsorption onto Dibenzo-30-crown-10 Ether Immobilized on Amberlite XAD7 Resin–Factorial Design Analysis

et al. 2020

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Platinum is a precious metal with many applications, such as: catalytic converters, laboratory equipment, electrical contacts and electrodes, digital thermometers, dentistry, and jewellery. Due to its broad usage, it is essential to recover it from waste solutions resulted out of different technological processes in which it is used. Over the years, several recovery techniques were developed, adsorption being one of the simplest, effective and economical method used for platinum recovery. In the present paper a new adsorbent material (XAD7-DB30C10) for Pt (IV) recovery was used. Produced adsorbent material was characterized by X-ray dispersion (EDX), scanning electron microscopy (SEM) analysis, Fourier Transform Infrared Spectroscopy and Brunauer-Emmett-Teller (BET) surface area analysis. Adsorption isotherms, kinetic models, thermodynamic parameters and adsorption mechanism are presented in this paper. Experimental data were fitted using three non-linear adsorption isotherms: Langmuir, Freundlich and Sips, being better fitted by Sips adsorption isotherm. Obtained kinetic data were correlated well with the pseudo-second-order kinetic model, indicating that the chemical sorption was the rate-limiting step. Thermodynamic parameters (ΔG°, ΔH°, ΔS°) showed that the adsorption process was endothermic and spontaneous. After adsorption, metallic platinum was recovered from the exhausted adsorbent material by thermal treatment. Adsorption process optimisation by design of experiments was also performed, using as input obtained experimental data, and taking into account that initial platinum concentration and contact time have a significant effect on the adsorption capacity. From the optimisation process, it has been found that the maximum adsorption capacity is obtained at the maximum variation domains of the factors. By optimizing the process, a maximum adsorption capacity of 15.03 mg g−1 was achieved at a contact time of 190 min, initial concentration of 141.06 mg L−1 and the temperature of 45 °C.

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Selective leaching of zinc from hazardous As-bearing zinc plant purification filter cake

Cited by 22 publications

References 31 publications

Investigation of an alternative chemical agent to recover valuable metals from anode slime

Investigation of an alternative chemical agent to recover valuable metals from anode slime

Toward high recovery and selective leaching of zinc from electric arc furnace dust with different physicochemical properties

Platinum (IV) Recovery from Waste Solutions by Adsorption onto Dibenzo-30-crown-10 Ether Immobilized on Amberlite XAD7 Resin–Factorial Design Analysis

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