Selective separation of metals from wastewater using sulfide precipitation: A critical review in agents, operational factors and particle aggregation

Zhang, Xingfei; Zeng, Liqiang; Wang, Yufeng; Tian, Jia; Wang, Jingbo; Sun, Wei; Han, Haisheng; Yong, Yang

doi:10.1016/j.jenvman.2023.118462

Cited by 20 publications

(5 citation statements)

References 138 publications

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“…The sulfide is another procedure that results in minimal solubility of metal sulfides, proving efficient for both free and complex metals. This method is efficient in free and particularly complex metals . The metal sulfide waste has a strong acid generation potential, which makes it undesirable for disposal.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Nickel from Nickel Sulfite-Fire Assay Dissolution Filtrate Through Precipitation

Mabowa,

Mkhohlakali,

Mokoena

et al. 2024

ACS Omega

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This study responds to stringent environmental regulations and increasing focus on resource conservation by exploring economically viable refining technologies through recycling. With the rising costs of filtrate disposal, there is a significant emphasis on removing and recycling valuable constituents, particularly nickel and copper (Ni and Cu). Herein, we employ analytical techniques with the aim of investigating an alternative method for recovering Ni and other valuable metals from a nickel sulfide-fire assay filtrate using Scurve precipitation under optimal conditions. The waste from the fire assay procedure contains substantial amounts of Ni and other critical metals, with concentrations of 62.7 g/L of Ni and 3.87 g/L of Cu. Prior to precipitation, traditional solvent extraction was used for Cu extraction, selectively removed before separating primary impurities such as iron (Fe). A pivotal aspect of this research involves applying S-curve precipitation with precise parameters at different pH levels. Analytical techniques reveal a minor depletion occurs as Ni is separated from Fe at a pH of 2.5, resulting in the formation of a refined Ni stream that is then refined into a mixed hydroxide Ni(OH) 2 product. The efficiency of 5,8-diethyl-7-hydroxydodecan-6-oxime (LIX 63−70) in extracting valueadded metals from fire assay waste is exceptionally high, integrating recycling and repurposing of value-added base metals to promote a circular economy.

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Section: Introductionmentioning

confidence: 99%

“…This method is efficient in free and particularly complex metals. 15 The metal sulfide waste has a strong acid generation potential, which makes it undesirable for disposal. However, the associated metal sulfide waste poses challenges due to its potential for strong acid generation, making disposal undesirable.…”

Section: Introductionmentioning

confidence: 99%

Removal of Nickel from Nickel Sulfite-Fire Assay Dissolution Filtrate Through Precipitation

Mabowa,

Mkhohlakali,

Mokoena

et al. 2024

ACS Omega

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“…A smaller solubility product for a given metal ion implies a higher probability of preferential precipitation. Therefore, theoretically, the order of precipitation for the four metal ions is as follows: Cu (pK=35.85) > Cd (27.19) > Zn (23.10) > Fe (16.47) [20]. In addition to the solubility product principle, inherent characteristics such as metal ion radius and ion charge also have important implications for Cu(II) removal using FeS in highconcentration zinc sulfate solutions.…”

Section: Proposed Removal Mechanismmentioning

confidence: 99%

“…The order of ion charges for the four metals is as follows: Cu (2.78) > Zn (2.70) > Fe (2.56) > Cd (2.06). However, the separation between similar elements is often difficult to achieve in an ideal manner as predicted by theoretical calculations, mainly due to external conditions, particularly the type of sulfidizing agent used [20]. To approach the ideal separation state, certain measures need to be taken.…”

Section: Proposed Removal Mechanismmentioning

confidence: 99%

Deep purification of copper from zinc sulfate solution using controllable aging FeS nanoparticles through slow-release sulfide precipitation

Zhang,

Tian,

Zeng

et al. 2024

J. Phys.: Conf. Ser.

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The purification of impurity ions within zinc hydrometallurgical solutions significantly impacts the subsequent quality of zinc electrodeposition. Traditional methods for copper removal from zinc solutions suffer from issues like limited reactivity, high consumption, and elevated costs. To address these challenges, controllable aging of FeS nanoparticles was designed, employing temperature variations to facilitate comprehensive copper removal from neutral zinc leachates. The aging process imparts a crystalline structure to the FeS nanoparticles, enabling the slow release of sulfide ions. A temperature of 60°C is regarded as the optimal aging temperature, at which the resultant FeS nanoparticles exhibit an optimal sustained-release performance during the aging process. Temperature has been found to be a crucial factor influencing the sustained-release performance of FeS. Once the reaction temperature surpasses 60°C, the utilization efficiency of S ions in the sustained-release agent can reach over 95%, with a maximum of 98.5%. Under optimal conditions featuring a reaction temperature of 60°C, a reaction duration of 30 minutes, and a solution pH maintained at 1, the dosage aged FeS at the S/Cu (II) ratio of 1.2 times, nearly 100% copper removal rate can be achieved. The maximum removal rate for cadmium does not exceed 2.5%, and the residual copper concentration in the zinc leachate is below 0.2 mg/L. The precipitate obtained is high-purity copper sulfide residue, which contains virtually no zinc. Slow-release sulfidation can maximize the utilization efficiency of sulfide ions in the solution, reduce the occurrence of competing reactions, and minimize the intermixing of products. It offers advantages such as high selectivity and deep purification.

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“…Thanks to the minimal solubilization of critical elements in the form of sulfide, the precipitation method for these elements (Equation (2)) can be utilized even in acidic media [67]. Previous studies have demonstrated that the addition of sodium sulfide can precipitate nearly all Cu, Pb, Cr, Zn, and Ni ions as sulfides [68][69][70][71].…”

Section: Chemical Precipitationmentioning

confidence: 99%

Efficient Metal Extraction from Dilute Solutions: A Review of Novel Selective Separation Methods and Their Applications

Rahmati,

Adavodi,

Hosseini

et al. 2024

Metals

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Notable increases in metal consumption and declining ore grades in recent decades have stressed the significance of dilute solutions as secondary sources of valuable metals. Moreover, environmental considerations and the imperative of sustainable development have further emphasized their treatment. Therefore, finding an efficient solution for separating metals from dilute solutions has attracted the attention of numerous researchers. This paper reviews the purification processes of dilute solutions and highlights key achievements of published research works. Although this study focuses on evaluating the efficiency of recently developed aqueous-phase purification methods, such as immobilized ligands, ionic liquids, and air-assisted solvent extraction, the application of conventional processes to treat these solutions, such as solvent extraction, ion exchange, membranes, chemical precipitation, and adsorption are also briefly outlined. To provide a comprehensive assessment, more than 200 research articles were reviewed, and their key findings are stated in this study. This research contributes to the advancement of knowledge of metal recovery from dilute solutions and sheds light on the dynamic evolution of this field.

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Selective separation of metals from wastewater using sulfide precipitation: A critical review in agents, operational factors and particle aggregation

Cited by 20 publications

References 138 publications

Removal of Nickel from Nickel Sulfite-Fire Assay Dissolution Filtrate Through Precipitation

Removal of Nickel from Nickel Sulfite-Fire Assay Dissolution Filtrate Through Precipitation

Deep purification of copper from zinc sulfate solution using controllable aging FeS nanoparticles through slow-release sulfide precipitation

Efficient Metal Extraction from Dilute Solutions: A Review of Novel Selective Separation Methods and Their Applications

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