Kinetic Analysis of Isothermal Leaching of Zinc from Zinc Plant Residue

Hollagh, Ali Reza Eivazi; Alamdari, Eskandar Keshavarz; Moradkhani, D.; Salardini, Ali Akbar

doi:10.4236/ijnm.2013.21002

Cited by 10 publications

(2 citation statements)

References 32 publications

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“…diffusion of the biogenic sulfuric acid through the solid‐product layer and not the liquid film boundary layer. The results are in agreement with previous studies carried out on the sulfuric acid leaching of Zn from oxidized Zn‐plant residues …”

Section: Discussionsupporting

confidence: 93%

Bioleaching and selective biorecovery of zinc from zinc metallurgical leach residues from the Três Marias zinc plant (Minas Gerais, Brazil)

Sethurajan

Lens

Rene

et al. 2016

J. Chem. Technol. Biotechnol

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BACKGROUND Gradual depletion of high‐grade ores for heavy metals has encouraged industries to search for alternative methods to recover metals. Wastes generated from metallurgical industries can be used as a secondary resource as it contains high concentrations of metals. RESULTS The bioleaching kinetics and biorecovery of zinc from Zn‐plant leach residues (ZLR), collected from a currently operating Zn‐plant in Três Marias (Minas Gerais, Brazil) were investigated using sulfuric acid producing Acidithiobacillus thiooxidans (A. thiooxidans). Response surface methodology (RSM) with full factorial central composite design (CCD) was applied to optimize Zn bioleaching by A. thiooxidans. The experiments were performed by varying the initial elemental sulfur concentration (5–30 g L−1), pulp density (5–50 g L−1) and initial pH (3.0–4.0 pH units). More than 75% of Zn was extracted from ZLR by A. thiooxidans under optimized conditions (sulfur concentration 25.1 g L−1, pulp density 21.5 g L−1 and initial pH 3.3). The leaching efficiencies of culture supernatant (biogenic sulfuric acid) and chemical sulfuric acid were compared to understand the leaching kinetics. The Zn leaching kinetics of ZLR followed the shrinking core diffusion model. Zn was selectively recovered from the Fe‐rich acidic bioleachate by biogenic sulfide precipitation. Fe was first removed (more than 85% of total Fe in the leachate) by adjusting the initial pH to 5.0, followed by selective Zn biorecovery. CONCLUSIONS Zn (>95%) was selectively recovered from Fe‐depleted ZLR by biogenic sulfides (with 1:1, Zn:biogenic sulfide mass ratio). Biohydrometallurgy can be a potential alternative resource recovery strategy for the selective recovery of Zn from ZLR. © 2016 Society of Chemical Industry

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Section: Discussionsupporting

confidence: 93%

Bioleaching and selective biorecovery of zinc from zinc metallurgical leach residues from the Três Marias zinc plant (Minas Gerais, Brazil)

Sethurajan

Lens

Rene

et al. 2016

J. Chem. Technol. Biotechnol

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“…Örneğin, sülfürik asitli ortamda Ç.E.A'dan çinkonun geri kazanımı üzerine yapılan bir çalışmada liç sıcaklığı olarak doğrudan 368 K seçilmiş ve optimum şartlarda %80 üzerinde çinko kazanıldığı belirtilmektedir [33]. Ayrıca yapılan başka bir çalışmada ise çinko ekstraksiyonunun liç süresiyle birlikte arttığını ama sıcaklığın 298'den 353 K'ye çıkarılmasının liç sistemini pek iyileştirmediği ifade edilmektedir [34].…”

Section: Liç Sıcaklığının Etkisiunclassified

Çinko Ekstraksiyon Artığından Korozyon Önleyici (Antikorozif) Endüstriyel Çinko Kromat Kompleks Çözeltisi Üretimi

Sarı,

Turan

2024

Fırat Üniversitesi Mühendislik Bilimleri Dergisi

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Çinko ekstraksiyon artığı (Ç.E.A) önemli miktarda çinko, kurşun, vb. metal bileşikleri içerir, dolayısıyla ikincil bir metal kaynağı olarak kabul edilirler. Bu çalışmada, çinko ekstraksiyon artığının sülfürik asit ve potasyum dikromat varlığında çeşitli parametrelerde selektif olarak liç edilerek optimum şartlarda endüstriyel korozyon önleyici çinko kromat kompleks çözeltisi (Zn(CrO4)2-) üretilmeye çalışılmıştır. Bunun için liç deneyleri, çoklu manyetik karıştırıcılı balon ısıtıcı bir düzenek vasıtasıyla 100 ml’lik cam balonlarda gerçekleştirilmiştir. Elde edilen sonuçlara göre artan liç sıcaklığı ile birlikte çinko kazanımının arttığı diğer taraftan selektifliği azaltan demirin ise sınırlı oranda çözündüğü belirlenmiştir. Optimum şartlar olarak 0.5 M sülfürik asit (H2SO4) derişimi, 0.5 M potasyum dikromat (K2Cr2O7) derişimi, 368 K liç sıcaklığı, 180 dk liç süresi, 25 mL/g sıvı-katı oranı ve 600 rpm karıştırma hızında Zn ve Fe ekstraksiyon verimleri sırasıyla %81.5 ve %5.3 olarak bulunmuştur. Diğer taraftan liç çözeltisinde çinko kromat kompleksi varlığını ortaya koymak için yapılan Raman spektroskopisi analizinde Zn2+ iyonlarının kromat (CrO42-) ile koordinasyon halinde bulunduğu belirlendi. Raman spektroskopisi ile hesaplanan koordinasyon sayısının 3,6 olduğu ortaya çıktı, bu da çözeltide Zn(CrO4)2- mevcudiyetinin var olduğunu ortaya koymaktadır. Ayrıca optimum şartlarda Pb’nin hiç çözünmediği ve liç kalıntısında sülfatları ve/veya kısmen kromatları şeklinde kaldığı saptandı.

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Fractionation and leachability of heavy metals from aged and recent Zn metallurgical leach residues from the Três Marias zinc plant (Minas Gerais, Brazil)

Sethurajan

Huguenot²,

Lens

et al. 2016

Environ Sci Pollut Res

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Various mineral processing operations to produce pure metals from mineral ores generate sludges, residues, and other unwanted by-products/wastes. As a general practice, these wastes are either stored in a reservoir or disposed in the surrounding of mining/smelting areas, which might cause adverse environmental impacts. Therefore, it is important to understand the various characteristics like heavy metal leaching features and potential toxicity of these metallurgical wastes. In this study, zinc plant leach residues (ZLRs) were collected from a currently operating Zn metallurgical industry located in Minas Gerais (Brazil) and investigated for their potential toxicity, fractionation, and leachability. Three different ZLR samples (ZLR1, ZLR2, and ZLR3) were collected, based on their age of production and deposition. They mainly consisted of Fe (6-11.5 %), Zn (2.5 to 5.0 %), and Pb (1.5 to 2.5 %) and minor concentrations of Al, Cd, Cu, and Mn, depending on the sample age. Toxicity Characteristic Leaching Procedure (TCLP) results revealed that these wastes are hazardous for the environment. Accelerated Community Bureau of Reference (BCR) sequential extraction clearly showed that potentially toxic heavy metals such as Cd, Cu, Pb, and Zn can be released into the environment in high quantities under mild acidic conditions. The results of the liquid-solid partitioning as a function of pH showed that pH plays an important role in the leachability of metals from these residues. At low pH (pH 2.5), high concentrations of metals can be leached: 67, 25, and 7 % of Zn can be leached from leach residues ZLR1, ZLR2, and ZLR3, respectively. The release of metals decreased with increasing pH. Geochemical modeling of the pH-dependent leaching was also performed to determine which geochemical process controls the leachability/solubility of the heavy metals. This study showed that the studied ZLRs contain significant concentrations of non-residual extractable fractions of Zn and can be seen as a potential secondary resource for Zn.

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Kinetic Analysis of Isothermal Leaching of Zinc from Zinc Plant Residue

Cited by 10 publications

References 32 publications

Bioleaching and selective biorecovery of zinc from zinc metallurgical leach residues from the Três Marias zinc plant (Minas Gerais, Brazil)

Bioleaching and selective biorecovery of zinc from zinc metallurgical leach residues from the Três Marias zinc plant (Minas Gerais, Brazil)

Çinko Ekstraksiyon Artığından Korozyon Önleyici (Antikorozif) Endüstriyel Çinko Kromat Kompleks Çözeltisi Üretimi

Fractionation and leachability of heavy metals from aged and recent Zn metallurgical leach residues from the Três Marias zinc plant (Minas Gerais, Brazil)

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