Efficient and safe disposition of arsenic by incorporation in smelting slag through copper flash smelting process

Zhang, Huibin; Wang, Yanan; He, Yuzheng; Xu, Shenghang; Hu, Bin; Zhou, Jun

doi:10.1016/j.mineng.2020.106661

Cited by 31 publications

(14 citation statements)

References 31 publications

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“…Secondary copper materials are added to existing copper smelters, but processing challenges arise as the tonnage of recycled WEEE increases (Reuters et al, 2013;Forsén et al, 2017;Wan et al, 2021). To treat the black copper (or dirty blister) produced by smelting high WEEE content feeds, pyrometallurgical converting and electrorefining (Forsén et al, 2017;Chen et al, 2012;Montenegro et al, 2013;Zhang et al, 2021) or pressurized sulfuric acid leaching and electrowinning (Tuncuk et al, 2012;Khaliq et al, 2014;Tesfaye et al, 2017) are being used.…”

Section: Introductionmentioning

confidence: 99%

Electrochemical codeposition of arsenic from acidic copper sulfate baths: The implications for sustainable copper electrometallurgy

Verbruggen

Ostermeyer

Bonin

et al. 2022

Minerals Engineering

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Copper producers face increased demand associated with increasing complexity in feedstock composition, including high amounts of impurity metals. In this work, linear sweep voltammetry was used to study the electrodeposition behavior of copper and arsenic, define strategies for the production of grade A copper, and the removal of arsenic from complex electrolytes. Our results show that the copper concentration is a key parameter to control in the electrodeposition process. The continuous deposition of arsenic from the electrolyte requires copper in solution (≤10 g L − 1 Cu(II) for 2 g L − 1 As(III)) to form copper arsenides. The deposition of metallic arsenic does not occur readily. Conversely, the use of a concentrated Cu(II) solution (e.g. 40 g L − 1 ) resulted in grade A copper from an electrolyte with a maximum of 2 g L − 1 As(III) under galvanostatic control at a current density of -42 mA cm − 2 . Time-of-Flight Secondary Ion Mass Spectrometry depth profile measurements on copper deposits revealed that arsenic contamination was entirely concentrated near the substrate side of the deposit and progressively decreased further into the deposit. The codeposition of arsenic occurred along with the initial copper nucleation, when the electrochemical potential for electrodepostion under galvanostatic control is temporarily lower. These findings provide important insights for future sustainable copper electrodeposition technologies from complex feedstocks.

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Section: Introductionmentioning

confidence: 99%

Electrochemical codeposition of arsenic from acidic copper sulfate baths: The implications for sustainable copper electrometallurgy

Verbruggen

Ostermeyer

Bonin

et al. 2022

Minerals Engineering

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“…The transformation behavior and bio-toxicity of arsenic is various among different phases of arsenic occurring in slag tailing. The presence of arsenic in sul de minerals showing relatively high susceptibility to alteration and increasing the mobilization potential of arsenic, while the arsenic in silicate minerals may be retained in the silicate lattice (Zhang et al, 2021a). Therefore, the research on association and chemical speciation of metallic elements (especially As) in slag tailing is extremely signi cant.…”

Section: Introductionmentioning

confidence: 99%

Speciation Characterization and Environmental Stability of Arsenic in Arsenic-Containing Copper Slag Tailing

Zhou

Shen

Zhang

et al. 2022

Preprint

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Increasing amounts of arsenic-containing impurities in Cu ores may deteriorate the smelting process and aggravate the environmental impact of slag tailing. Geochemical, mineralogical and chemical speciation characteristics were investigated to elucidate the association and environmental stability of metal(loid)s in copper slag tailing. Results shown that the bulk chemical compositions of the selected slag tailing are Fe2O3 (54.8%) and SiO2 (28.1%). The selected slag tailing may lead to multi-elemental contamination potential for the elevated concentrations of environmental sensitively elements. The mineral phases in slag tailing are silicate (fayalite), oxides (magnetite and hematite), sulfides (galena, sphalerite, arsenopyrite and chalcopyrite). The invariably overlap of silicate, iron, arsenic and oxygen in the elemental distribution suggested that arsenic is existed silicate minerals as Si-Fe-As-O phases. Meanwhile, arsenic is also associated with sulfide minerals and oxides. The percentages of arsenite (As(III)) and arsenate (As(V)) are 59.4% and 40.6% in the selected slag tailing, respectively. The slag tailing is regarded non-hazardous waste for the tiny amounts of toxic elements in leachates. Nevertheless, the slag tailing should be property disposed for the elevated carbonate bound of As and Cu in the slag tailing.

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“…Ores and concentrates from flotation containing high concentrations of arsenic are considered a potential hazard, requiring special precautions in the beneficiation and smelting processes. According to [ 3 ], the annual copper output from ore smelting reaches more than 7 million tons in China. Generally, the contents of As and Cu in copper concentrate are 0.2% and 25%, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…Along with the smelting process of copper, arsenic is successively removed and transformed into various byproducts such as slags, flue dust, black copper, anode slime, etc. [ 3 ]. These Arsenic compounds contain byproducts that could be processed to either recover the valuable metals or be discarded as waste in dumps.…”

Section: Introductionmentioning

confidence: 99%

The Enhancement of Enargite Dissolution by Sodium Hypochlorite in Ammoniacal Solutions

et al. 2021

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The dissolution of both copper and arsenic from a copper concentrate was investigated in oxidative ammonia/ammonium solutions at moderate temperatures and atmospheric pressure. The main parameters studied were temperature, pH, concentrations of different ammonia salts, the presence of sodium hypochlorite, pretreatment with sodium chloride, and curing period. In all ammoniacal solutions studied, increasing the temperature enhanced the dissolution of copper, but the dissolution of arsenic remained marginal. Mixing the copper concentrate with sodium chloride and leaving it to rest for 72 h before leaching in ammoniacal solutions significantly increased the dissolution of copper and slightly increased the dissolution of arsenic from the concentrate. A maximum of 35% of Cu and 3.3% of As were extracted when ammonium carbonate was used as the lixiviant. The results show relatively rapid dissolution of the concentrate with the addition of sodium hypochlorite in ammonium carbonate solution, achieving a dissolution of up to 50% and 25% of copper and arsenic, respectively. A copper dissolution with a non-linear regression model was proposed, considering the effect of NaClO and NH4Cl at 25 °C. These findings highlight the importance of using the correct anionic ligands for the ammonium ions and temperature to obtain a high dissolution of copper or arsenic. The results also showed that the curing time of the packed bed before the commencement of leaching appeared to be an important parameter to enhance the dissolution of copper and leave the arsenic in the residues.

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Efficient and safe disposition of arsenic by incorporation in smelting slag through copper flash smelting process

Cited by 31 publications

References 31 publications

Electrochemical codeposition of arsenic from acidic copper sulfate baths: The implications for sustainable copper electrometallurgy

Electrochemical codeposition of arsenic from acidic copper sulfate baths: The implications for sustainable copper electrometallurgy

Speciation Characterization and Environmental Stability of Arsenic in Arsenic-Containing Copper Slag Tailing

The Enhancement of Enargite Dissolution by Sodium Hypochlorite in Ammoniacal Solutions

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