Decomposition of pyrite and the interaction of pyrite with coal organic matrix in pyrolysis and hydropyrolysis

Chen, H

doi:10.1016/s0016-2361(00)00015-6

Cited by 107 publications

(70 citation statements)

References 11 publications

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“…During pyrolysis, a portion of inorganic sulfur and volatile organic sulfur pass into the tar or gas, while sulfur compounds remaining in the coke are mainly stable organic sulfur and products of inorganic sulfur [6,7]. FeS 2 can be transformed into ferrous sulfide (FeS) and very active sulfur above 350°C during pyrolysis.…”

Section: Introductionmentioning

confidence: 99%

“…FeS 2 can be transformed into ferrous sulfide (FeS) and very active sulfur above 350°C during pyrolysis. And the active sulfur can be captured by functional groups in coal matrix to form hydrogen sulfide (H 2 S), carbon disulfide (CS 2 ) and sulfur dioxide (SO 2 ), or to convert to new organic sulfur species left in char or tar [7][8][9][10]. During pyrolysis of coal, the decomposition of pyrite is influenced by numerous factors such as other forms of sulfur, coal rank and reaction conditions [5][6][7]11].…”

Section: Introductionmentioning

confidence: 99%

“…And the active sulfur can be captured by functional groups in coal matrix to form hydrogen sulfide (H 2 S), carbon disulfide (CS 2 ) and sulfur dioxide (SO 2 ), or to convert to new organic sulfur species left in char or tar [7][8][9][10]. During pyrolysis of coal, the decomposition of pyrite is influenced by numerous factors such as other forms of sulfur, coal rank and reaction conditions [5][6][7]11]. Previous works examined interactions between pyritic sulfur and various organic species, sulfur distribution in coke, intermediates of the secondary reactions, effect of pyrite on sulfur retention and thermal decomposition of Fe-S compounds formed after pyrolysis [2,10,[12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Grain size classification and control will be a method of great feasibility and operability, since the efficiency of coal pyrolysis and desulfurization could be influenced by changing the particle size of feed coal or blending coal [7,[16][17][18][19][20][21]. Experiments on sulfur reduction by controlling the particle size distributions (PSD) are valuable for coking industry.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of coal particle size on distribution and thermal behavior of pyrite during pyrolysis

Zhao

Bai

et al. 2015

Fuel

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of coal particle size on distribution and thermal behavior of pyrite during pyrolysis

Zhao

Bai

et al. 2015

Fuel

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“…[20][21][22][23][24] Similarly, silicate tends to induce the easily removable organic sulfur compounds to convert to thermally stable organic sulfur compounds, i.e., thiophenic or condensed thiophenic compounds. [24][25][26] Accordingly, given the above points, it seems that ZnO and Fe 2 O 3 are promising sorbents for the coking of coal, but BFD must be treated chemical or thermally before being used as a sorbent because of the signifi cant and complicated infl uence of its phase/chemical composition on its desulfurization ability.…”

Section: Resultsmentioning

confidence: 99%

Desulfurization of coke oven gas from the coking of coking coal blended with a sorbent and waste plastic

Zhao

Xie

et al. 2007

J Mater Cycles Waste Manag

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A new way to implement the simultaneous reutilization of solid waste, the desulfurization of coke oven gas (COG), and even the desulfurization of coke by the cocoking of coking coal (CC) and waste plastic (WP) blended with a sorbent is proposed; the evolution of H 2 S and the removal effi ciency of H 2 S from COG during the co-coking process were investigated in a lab-scale cylindrical reactor. The experimental results indicated that for the coking of CC blended with ZnO, Fe 2 O 3 , or blast furnace dust (BFD) as a sorbent, the instantaneous concentration of H 2 S in COG was lower than 500 mg/m 3 (which meets the technical specifi cation requirement of the Chinese Cleaner Production Standard-Coking Industry, HJ/T 126-2003) when the molar ratio between the key component of the sorbent and the volatile S in CC or the CC/WP blend, n Zn+Fe /n S , was about 1.2 for ZnO and Fe 2 O 3 , but not for BFD under the same conditions, suggesting that ZnO and Fe 2 O 3 are promising sorbents, but that BFD must be treated chemical or thermally before being used as a sorbent because of the size and complicated nature of the infl uence of its phase/chemical composition on its desulfurization ability. However, for the co-coking of CC and WP blended with ZnO as a sorbent, n Zn+Fe /n S must increase to 1.4 and 1.7 for 100/2 and 100/5 blends of CC/WP, respectively, to ensure a satisfactory efficiency for H 2 S removal from COG.

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Solidification of sulfur and arsenic in gold concentrate and leaching of the gold by thiosulfate

et al. 2020

Asia-Pacific J Chem Eng

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The processing of refractory minerals rich in arsenic and sulfur often causes give off arsenic and sulfur contamination during roasting and oxidation pretreatments. In this paper, the solidification of elemental arsenic and sulfur by adding calcium-containing compounds (calcium oxide, calcium carbonate, and calcium hydroxide) during roasting and oxidation was investigated with the aim of reducing environmental pollution. At the same time, the gold leaching from residues produced by solidification roasting and oxidation using nontoxic and environmentally friendly green copperammonia-thiosulfate method was also studied. The results indicated that a relatively better solidification effect of SO 2 and As 2 O 3 was achieved by adding Ca (OH) 2 , with a solidification efficiency for sulfur and arsenic as 84.67% and 50%, respectively. When copper-ammonia-thiosulfate leaching was carried out on the residues after solidification roasting, it was found that a 90% gold leaching percentage was obtained. Via characterization using Brunauer-Emmett-Teller surface area, scanning electron microscope, X-ray diffraction, and X-ray photoelectron spectroscopy, it was also found that the arsenic and sulfur in arsenopyrite were oxidized into stable and safe sulfates and arsenates after solidification. The results show that solidification roasting oxidation is an efficient and environmentally friendly pretreatment method, and the gold in the calcine can be effectively leached out via the green copper-ammonia-thiosulfate system. K E Y W O R D Sgold leaching, refractory gold concentrate, solidification of sulfur and arsenic, thiosulfate

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Decomposition of pyrite and the interaction of pyrite with coal organic matrix in pyrolysis and hydropyrolysis

Cited by 107 publications

References 11 publications

Effect of coal particle size on distribution and thermal behavior of pyrite during pyrolysis

Effect of coal particle size on distribution and thermal behavior of pyrite during pyrolysis

Desulfurization of coke oven gas from the coking of coking coal blended with a sorbent and waste plastic

Solidification of sulfur and arsenic in gold concentrate and leaching of the gold by thiosulfate

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