Thermal decomposition characteristics of mercury compounds in industrial sludge with high sulfur content

Back, Seung Ki; Bhatta, Dhruba; Kim, Seong Heon; Jang, HeeJin; Kim, Jeong Hun; Kim, Ki Heon; Kim, Young Ran; Seo, Yong Chil

doi:10.1007/s10163-017-0630-4

Cited by 7 publications

(3 citation statements)

References 32 publications

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“…This order was consistent with previous reports on the TPHT of pure Hg compound species. 7,8,13) In contrast, the maximum TPHT peak temperatures of HgO, HgS, and HgSO 4 in this study (Table 2) appear at higher temperatures than those of other research groups using air atmosphere; [14][15][16][17] however, the above three species were in close agreement with previous reports that adopted nitrogen atmosphere. 18) Although Hg-TPHT has been conducted by several researchers to investigate the morphology of Hg in samples such as coal, coal ash, and gypsum, the maximum TPHT peak temperature and evolution temperature of pure Hg compound species are different.…”

Section: Hg Release During Tpht Of Model Compoundssupporting

confidence: 91%

“…18) Although Hg-TPHT has been conducted by several researchers to investigate the morphology of Hg in samples such as coal, coal ash, and gypsum, the maximum TPHT peak temperature and evolution temperature of pure Hg compound species are different. [7][8][9]14,15,[18][19][20][21][22][23][24] Previous studies investigating Hg morphology in solids derived from coal utilization and gypsum via TPHT partitioned the peaks above 600°C into HgSO 4 peaks. 9,19) Considering the above points, the results of the TPHT in Table 2 are considered logical.…”

Section: Hg Release During Tpht Of Model Compoundsmentioning

confidence: 99%

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Evolution of Mercury from Iron Ores in Temperature-Programmed Heat Treatments

2022

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The behavior of Hg released from iron ores during temperature-programmed heat treatments (TPHTs) in air has been mainly studied using an online monitoring method. The Hg release behavior in TPHT significantly depends on the type of ore being processed, which includes forms evolved as Hg 0 and Hg 2 + , and forms that remain thermally stable up to 950°C. In addition, the TPHT experiments for model Hg compounds suggested the presence of several types of Hg forms (HgCl 2 , Hg 2 Cl 2 , HgS, HgO, HgSO 4 , and associated mineral-Hg) in the iron ores used. The amounts and proportions of suggested forms of Hg species substantially depend on the type and composition of the iron ore used. These observations may be important in designing an efficient method for the removal of Hg from iron ore and gaseous Hg.

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Section: Hg Release During Tpht Of Model Compoundssupporting

confidence: 91%

Section: Hg Release During Tpht Of Model Compoundsmentioning

confidence: 99%

Evolution of Mercury from Iron Ores in Temperature-Programmed Heat Treatments

2022

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“…In literature. different sample preparations, heating rates, sample dwell times, and methods of analysis are described which deliver different results 8, 9, 11–15. Tab.…”

Section: Introductionmentioning

confidence: 99%

Speciation of Inorganic Mercury Compounds in Solid Samples via Thermo‐desorption Experiments

2021

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To establish a standardized method for specifying mercury in solid samples, a database of relevant mercury species is created via thermo‐desorption. By measuring Hg(t) and Hg(0), different evaporation characteristics of mercury halides, sulfide, oxides, nitrates, and sulfates were recorded. It was possible to create a baseline for analyzing solid samples with unknown mercury content. All mercury species without a halide compound evaporate over 200 °C and as elemental mercury. All mercury halides evaporate mainly as oxidized species. From this fact it can be concluded that mercury halides desublimate when heated and have a vapor pressure as a solid. This unique characteristic was only seen by mercury halides. All other species seem to decompose into their single components when heated.

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