Waste-free separation and recovery of copper telluride slag by directional sulfidation-vacuum distillation

Li, Zhichao; Deng, Jiankang; Liu, Dachun; Jiang, Wenlong; Zha, Guozheng; Huang, Daxin; Deng, Peilin; Li, Baole

doi:10.1016/j.jclepro.2022.130356

Cited by 15 publications

(3 citation statements)

References 17 publications

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“…It has been widely used in the purification of crude metals, separation of alloys, recovery of secondary resources, etc. [4]. It is an important method for industrial arsenic purification as the oxidation of highly volatile arsenic can be avoided by vacuum processes.…”

Section: Introductionmentioning

confidence: 99%

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Removal of Antimony from Industrial Crude Arsenic by Vacuum Sublimation: Combination of Thermodynamics and Ab Initio Molecular Dynamics

Zuo,

Duan,

Liu

et al. 2024

Metals

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Thermodynamic theory was employed in this study to investigate the feasibility of separating antimony (Sb) from crude arsenic (As) using vacuum sublimation. Ab initio molecular dynamics simulations are used to calculate the structure, stability, and diffusion properties of AsmSbn (m + n ≤ 6) clusters. As4, As3Sb, As2Sb2, and AsSb3 are the possible clusters in this thermodynamic calculation, and the molecular dynamics results confirmed their structural stability and stabilization in the gas phase. As4 had the largest diffusion coefficients, which is the reason it separates from the Sb-containing clusters (As3Sb, As2Sb2, and AsSb3) during gas-phase diffusion and condensation processes. The experimental results show that As vapor was transformed from crystalline to amorphous with increasing subcooling, and the Sb-containing clusters that enter the gas phase were mainly condensed and deposited at the proximal end of the heating zone. Not considering the volatilization rate, the removal rate of Sb in products can reach 99.35% by increasing the condensation disk and expanding the condensation zone; thus, experiments confirmed that industrial crude arsenic can realize deep Sb removal after vacuum sublimation.

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Section: Introductionmentioning

confidence: 99%

“…4 and Sb 4 that can be used to guide the design of condenser structures. The ab initio molecular dynamics simulations of As m Sb n (m + n ≤ 6) clusters show that As 4 , As 3 Sb, As 2 Sb 2 , and AsSb 3 are well stabilised.…”

mentioning

confidence: 99%

Removal of Antimony from Industrial Crude Arsenic by Vacuum Sublimation: Combination of Thermodynamics and Ab Initio Molecular Dynamics

Zuo,

Duan,

Liu

et al. 2024

Metals

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show abstract

“…In this work, a selective sulfurization-vacuum distillation method was applied for the removal of mercury from crude selenium. The main process involves the introduction of sulfur groups into the Se-Hg system to modify the phase of mercury, and then mercury can be selectively mineralized [16,17]. Se and Hg are separated, which is convenient for subsequent recovery, and then a physical vacuum distillation method is used to volatilize selenium.…”

Section: Introductionmentioning

confidence: 99%

Combined Sulfidation and Vacuum Distillation for the Directional Removal of Hazardous Mercury from Crude Selenium

Zha

2023

Metals

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In this work, an innovative process involving directional sulfurization–vacuum distillation is proposed to effectively remove trace levels of mercury impurities from crude selenium. First, a reaction between sulfur and mercury is used to break the strong chemical Se-Hg bond to achieve the sulfide mineralization of mercury. Second, selenium and mercury are separated by vacuum distillation based on a difference in volatility. Thermodynamic analysis confirms the feasibility of this method. The experimental results show that the sulfidation reaction potential energy of different sulfidizing agents is in the order S > Na2S > FeS, and the optimum conditions are determined to be the following: a sulfidation temperature of 473 K and time of 30 min, and vacuum distillation experimental parameters of 503 K, 60 min, and 10–20 Pa system pressure. The overall experimental results show that the maximum removal of mercury is 97.49%. The content of mercury in the refined selenium was reduced from 0.32% to 0.0088% in the volatile matter. The results have practical value for the separation of selenium and mercury from hazardous wastes.

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Evaporation Trends for Elemental Tellurium Recovery in a Te–Cu2S System Produced from a Sustainable Sulfidation-Vacuum Distillation Process

Li,

Zha,

Jiang

et al. 2024

Metall Mater Trans B

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Waste-free separation and recovery of copper telluride slag by directional sulfidation-vacuum distillation

Cited by 15 publications

References 17 publications

Removal of Antimony from Industrial Crude Arsenic by Vacuum Sublimation: Combination of Thermodynamics and Ab Initio Molecular Dynamics

Removal of Antimony from Industrial Crude Arsenic by Vacuum Sublimation: Combination of Thermodynamics and Ab Initio Molecular Dynamics

Combined Sulfidation and Vacuum Distillation for the Directional Removal of Hazardous Mercury from Crude Selenium

Evaporation Trends for Elemental Tellurium Recovery in a Te–Cu2S System Produced from a Sustainable Sulfidation-Vacuum Distillation Process

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