Mercury recovery from mercury-containing wastes using a vacuum thermal desorption system

Lee, Woo Rim; Eom, Yujin; Lee, Tai Gyu

doi:10.1016/j.wasman.2016.12.017

Cited by 20 publications

(4 citation statements)

References 8 publications

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“…The process involves the roasting of SS at 700 °C and then, a cooling process in two steps. In the first cooling step, the mercury species would be removed from the off-gases using a condenser [67], in which the gases are cooled down to around 300 °C (below to evaporation point of Hg), obtaining a solid residue from the process. In the second step, the metallic Se is recovered at a lower temperature; lower to Se melting point, 221 °C, as indicated in DTA curve.…”

Section: Proposal For Their Valorisationmentioning

confidence: 99%

Characterization of Two Sludges from a Pyrometallurgical Copper Smelting Complex for Designing a Se and Pb Recovery Proposal

Paz-Gómez

Pérez-Moreno

Ruiz-Oria

et al. 2020

Waste Biomass Valor

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Gas scrubbing sludge (SS) and fine dust of converters (SC) are wastes generated in the off-gas cleaning system of smelting and converting processes. Both wastes are considered hazardous materials due to their high metal contents and leaching characteristics. The main purpose of this study was to gain essential knowledge on the recovery of valuable elements contained in these wastes. Thus, an exhaustive characterization was carried out to determine the composition, mineral phases, particle size, and leachability of both wastes (SS and SC) as a preliminary step to select the most appropriate applications and treatment for them. These wastes are composed of fine particles (~ 95% < 63 µm), mainly containing Pb (> 20%) as anglesite (PbSO 4), while SS presents a high concentration of Se (34%), which is mainly identified as metallic selenium. Therefore, these residues could be used as secondary sources of Pb and Se. The recovery of Se by roasting process and Pb recovery by hydrometallurgical route seem to be the best options for the management of these wastes.

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Section: Proposal For Their Valorisationmentioning

confidence: 99%

Characterization of Two Sludges from a Pyrometallurgical Copper Smelting Complex for Designing a Se and Pb Recovery Proposal

Paz-Gómez

Pérez-Moreno

Ruiz-Oria

et al. 2020

Waste Biomass Valor

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“…Selenium with a purity of over 99.99% has become a key material to support the development of advanced technology and new products because of its excellent metallic properties [3,4]. However, the process of selenium recovery and purification often presents environmental hazards, especially when crude selenium contains harmful elements such as mercury [5,6]. Generally, 90% of crude selenium comes from smelting byproducts produced from copper anode slime [7,8].…”

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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“…Several parameters have been associated with the efficiency of the thermal desorption for soil contaminated with Hg, in terms of temperature, heating rate, reaction time, and chemical additives (Guo et al 2017 ; Lee et al 2017 ; Liu et al 2019 ; Tian et al 2019 ). In the literature, there is no unique practice for thermal desorption.…”

Section: Introductionmentioning

confidence: 99%

Effect of inorganic carbonate and organic matter in thermal treatment of mercury-contaminated soil

Cho

Kang

Kim

et al. 2021

Environ Sci Pollut Res

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Thermal treatment of mercury (Hg)-contaminated soil was studied to investigate the desorption behavior of Hg at different temperatures. The soil samples were collected from two locations with different land uses around the mine and industrial site. The effect of soil properties such as inorganic carbonate minerals and organic matter content on Hg desorption was investigated to understand the thermal desorption process. The effect of soil composition on Hg desorption showed that behavior at 100 °C was similar, but a different behavior could be found at 300 °C. The thermal desorption efficiency at 300 °C is affected by the thermal properties of soils and the Hg desorption capacity of the soils. The Hg from both soil types was removed above 300 °C, and Hg was effectively removed from mine soil due to the partial decomposition of carbonate in the soil composition, while industrial soil showed that desorption would be restrained by Hg organic matter complexes due to organic matter content. Despite a relatively higher concentration of Hg in the mine soil, Hg removal efficiency was greater than that in the industrial soil. Sequential extraction results showed that only the Hg fractions (residual fractions, step 6) in mine soil changed, while the industrial soil was affected by changes in Hg fractions (step 3 to step 6) at 300 °C. Changes in soil pH during thermal desorption are also influenced by heating time and temperature. Therefore, the mechanisms of Hg desorption during thermal treatment were observed by soil properties. The volatilization of Hg in the soil is induced by organic carbon, while soil Hg release is controlled by organic matter complexes.

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Mercury recovery from mercury-containing wastes using a vacuum thermal desorption system

Cited by 20 publications

References 8 publications

Characterization of Two Sludges from a Pyrometallurgical Copper Smelting Complex for Designing a Se and Pb Recovery Proposal

Characterization of Two Sludges from a Pyrometallurgical Copper Smelting Complex for Designing a Se and Pb Recovery Proposal

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

Effect of inorganic carbonate and organic matter in thermal treatment of mercury-contaminated soil

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