Transformation of arsenic-rich copper smelter flue dust in contrasting soils: A 2-year field experiment

Jarošíková, Alice; Ettler, Vojtěch; Mihaljevič, Martin; Penížek, Vít; Matoušek, Tomáš; Culka, Adam; Drahota, Petr

doi:10.1016/j.envpol.2018.02.028

Cited by 29 publications

(6 citation statements)

References 59 publications

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“…The high-arsenic dust (As > 30 wt. %) could not be recirculated back into the smelting system and converting process [22]. The original dust was firstly dried at 100 • C for 24 h in a draught drying cabinet and then crushed, ground and mixed to a homogeneous powder for the preparation of analytical and experimental samples [23,24].…”

Section: Methodsmentioning

confidence: 99%

Selective Separation of Arsenic from Lead Smelter Flue Dust by Alkaline Pressure Oxidative Leaching

Liu

Han

et al. 2019

Minerals

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This study investigated the feasibility of using an alkaline pressure oxidative leaching process to treat lead smelter flue dust containing extremely high levels of arsenic with the aim of achieving the selective separation of arsenic. The effects of different parameters including NaOH concentration, oxygen partial pressure, liquid-to-solid ratio, temperature, and time for the extraction of arsenic were investigated based on thermodynamic calculation. The results indicated that the leaching efficiency of arsenic reached 95.6% under the optimized leaching conditions: 80 g/L of NaOH concentration, 1.0 MPa of oxygen partial pressure, 8 mL/g of liquid-to-solid ratio, 120 °C of temperature, 2.0 h of time. Meanwhile, the leaching efficiencies of antimony, cadmium, indium and lead were less than 4.0%, basically achieving the selective separation of arsenic from lead smelter flue dust. More than 99.0% of arsenic was converted into calcium arsenate product and thus separated from the leach solution by a causticization process with CaO after other metal impurities were removed from the solution with the addition of Na2S. The optimized causticization conditions were established as: 4.0 of the mole ratio of calcium to arsenic, temperature of 80 °C, reaction time of 2.0 h. The resulting product of calcium arsenate may be used for producing metallic arsenic.

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Section: Methodsmentioning

confidence: 99%

Selective Separation of Arsenic from Lead Smelter Flue Dust by Alkaline Pressure Oxidative Leaching

Liu

Han

et al. 2019

Minerals

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“…In addition, traditional pyrometallurgical technologies used in the processing of higharsenic copper raw materials often lead to negative impacts on the environment [2,[16][17][18][19][20][21][22][23][24][25]. The low environmental safety of such schemes is a serious obstacle to the environmentally sustainable development of enterprises.…”

Section: Introductionmentioning

confidence: 99%

Purification of Copper Concentrate from Arsenic under Autoclave Conditions

Karimov,

Dizer,

Tretiak

et al. 2024

Metals

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This study presents the results of a two-stage autoclave processing of a copper–arsenic concentrate. Copper concentrate is an important raw material to produce copper and other metals. However, in some cases, the concentrate may contain increased amounts of arsenic, which makes further processing difficult. Therefore, the development of modern hydrometallurgical methods for processing copper concentrate with a high arsenic content is an urgent task, which could lead to the optimization of the raw material processing process and the improvement of the quality of the concentrate. It has been established that the optimal conditions for the sequential two-stage autoclave processing of copper–arsenic concentrate are: t = 220–225 °C, τoxidation = 20 min, τtot = 90 min, Po2 = 0.4 MPa, and L:S = 10:1, [H2SO4]initial = 40 g/dm3; in this case, 85% of zinc, 44% of iron, and 78% of arsenic, respectively, are extracted into the solution during both stages and the loss of copper was about 0.01%. This is explained by the fact that at the first stage (oxidation) of the autoclave processing of the copper–arsenic concentrate, copper, together with iron, leaches into the solution, and at the second stage (reduction), copper precipitates out of the solution in the form of chalcocite. Copper in the residue after autoclave leaching is in the form of Cu2S, iron is in the form of pyrite (FeS2), and lead is in the form of anglesite (PbSO4), respectively. The obtained micrographs and EDX mappings clearly show no iron arsenates. This confirms that at the oxidative stage of the developed process, arsenic, removed by 78%, remains in the solution. The remaining arsenic is associated with tennantite, indicating the effectiveness of the treatment process in removing arsenic from the copper–arsenic concentrate. A second important observation is the presence of pronounced areas of copper sulfides in the microphotos without iron and arsenic impurities. This confirms that copper is deposited as chalcocite during the reduction phase of the process, which is the desired result.

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“…However, this is prevented by a very high arsenic content; about 15% of the arsenic contained in the concentrate goes into matte, about 22% into slag, and the remaining arsenic into dust [8]. The arsenic content in CFD can reach half the total mass of dust [9]. With sizes ranging from tens of microns to hundreds of nanometers, CFD poses a serious threat to the environment, and its storage is highly undesirable [10].…”

Section: Introductionmentioning

confidence: 99%

Ultrasound-Assisted Selective Leaching of Arsenic from Copper Smelting Flue Dust

Kenzhaliyev,

Ketegenov,

Mussapyrova

et al. 2024

Minerals

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Copper smelting flue dust (CFD) is a byproduct of pyrometallurgical copper production, containing valuable metals like lead, zinc, and copper, but also hazardous arsenic, which complicates its handling and recycling. Traditional methods for arsenic removal from CFD, such as pyrometallurgical and hydrometallurgical processes, are often inefficient or result in the loss of valuable metals. This study explores the efficacy of ultrasound-assisted leaching for selective arsenic extraction from CFD, offering a potentially more efficient and environmentally friendly alternative. We employed a combination of sodium hydroxide and sodium sulfide in an aqueous solution, enhanced by ultrasonic waves, to selectively recover arsenic into solution. The optimal leaching conditions were determined to be 0.4 M NaOH, 0.2 M Na2S, a liquid-to-solid ratio of 50 mL/g, a temperature of 80 °C, an ultrasound power of 150 W, and an ultrasound frequency of 100 kHz, under which up to 99% of arsenic was extracted within 45 min. The kinetic analysis conducted suggests that the leaching process is controlled by the chemical reactions occurring at the surface of the particles.

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Transformation of arsenic-rich copper smelter flue dust in contrasting soils: A 2-year field experiment

Cited by 29 publications

References 59 publications

Selective Separation of Arsenic from Lead Smelter Flue Dust by Alkaline Pressure Oxidative Leaching

Selective Separation of Arsenic from Lead Smelter Flue Dust by Alkaline Pressure Oxidative Leaching

Purification of Copper Concentrate from Arsenic under Autoclave Conditions

Ultrasound-Assisted Selective Leaching of Arsenic from Copper Smelting Flue Dust

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