Modes of occurrence and thermal stability of mercury in different samples from Guandi coal preparation plant

Gao, Libing; Wang, Yiping; Huang, Qunwu; Guo, Shaojun

doi:10.1016/j.fuel.2017.03.045

Cited by 19 publications

(15 citation statements)

References 34 publications

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“…The studies reported that acid leaching method was used to separate the ash and pyrite from coal to achieve the separation of mercury in different forms. Tables and showed the removal efficiencies of ash and pyrite by acid leaching were up to 93%.…”

Section: Resultsmentioning

confidence: 99%

“…According to the literature, mercury in coal existed in the forms of inorganic mercury and organic mercury . Most of the inorganic mercury was associated with pyrite (FeS 2 ), and the rest occurred in other forms, including mercury halogen compounds, mercuric oxide, mercuric sulfide, mercuric sulfate, and mercury nitrate . Sulfur and mercury in coal had significant correlation in occurrence mode and content, resulting in similar release behavior during pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

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Mercury occurrence modes in coal and the sulfur–mercury removal performance during coal pyrolysis

Zhang

Dong

et al. 2019

Asia-Pacific J Chem Eng

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The mild pyrolysis of coal provided a promising alternative method for mercury and sulfur emission control before coal combustion. In the work, the occurrence modes of mercury in one lignite and two bituminous coals were characterized by temperature-programmed decomposition with acid leaching. The removal performance of sulfur-mercury was also investigated by mild pyrolysis under weak oxidizing atmosphere. The results showed that the contents of organic-bound mercury, pyrite-bound mercury, and ash-bound mercury were in the range of 35-55%, 15-45%, and 10-45%, with their release temperature in the range of 250-650, 500-700, and >700°C, respectively. Sulfur and mercury were removed by fast pyrolysis at 500°C under 2%O 2 − N 2 atmosphere, and the proportion of Hg 2+ in gas phase increased. The results indicated that the oxygen had participated in the decomposition of the mercury-containing and sulfur-containing compounds, and some stable mercury-containing and sulfur-containing compounds were easier for decomposition under weak oxidizing atmosphere at low temperature. The removal efficiency of sulfur and mercury significantly increased under weak oxidizing atmosphere by fast pyrolysis. It was because fast pyrolysis could accelerate the breakup of molecular bonds associated with sulfur-mercury at a low temperature. The pore structure of char produced by fast pyrolysis was improved, which was favorable for sulfur containing gas and mercury release.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mercury occurrence modes in coal and the sulfur–mercury removal performance during coal pyrolysis

Zhang

Dong

et al. 2019

Asia-Pacific J Chem Eng

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“…Mercury, assumed to be organically bound, may be associated with finely dispersed pyrite, which is protected by the coal matrix. A number of studies [36,[70][71][72][73] showed the mode of occurrence of Hg is predominantly associated with pyrite. Finkelman [30] emphasizes that around 90% of the Hg is associated with sulfides likely with pyrite which is the predominant sulfide in most bituminous coals and at least 75% was associated with sulfide minerals in low rank coals.…”

Section: Volatile Trace Elementsmentioning

confidence: 99%

Changes and Distribution of Modes of Occurrence of Seventeen Potentially-Hazardous Trace Elements during Entrained Flow Gasification of Coals from Ningdong, China

et al. 2018

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“…A number of scientists are working on the determination and measurement of mercury contents in coal and reported sufficient data to elucidate the emission process of Hg from coal combustion and pyrolysis. [5][6][7][8][9][10][11] Unfortunately, the information and results available on the existence and evolution behavior of Hg from iron ore, which is a major raw material for the metallurgic industry and pig-iron and steel productions, are insufficient. However, the availability of data and information on the release forms and behavior of Hg will facilitate the improvement of the emission control and reduction technology.…”

Section: Introductionmentioning

confidence: 99%

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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Modes of occurrence and thermal stability of mercury in different samples from Guandi coal preparation plant

Cited by 19 publications

References 34 publications

Mercury occurrence modes in coal and the sulfur–mercury removal performance during coal pyrolysis

Mercury occurrence modes in coal and the sulfur–mercury removal performance during coal pyrolysis

Changes and Distribution of Modes of Occurrence of Seventeen Potentially-Hazardous Trace Elements during Entrained Flow Gasification of Coals from Ningdong, China

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

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