Transformation pathway of excluded mineral pyrite decomposition in CO 2 atmosphere

Huang, Fang; Zhang, Liqi; Yi, Baojun; Xia, Zuojun; Chen, Zheng

doi:10.1016/j.fuproc.2015.07.028

Cited by 33 publications

(17 citation statements)

References 44 publications

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“…Previous studies [28][29][30] have also revealed that the sulfur-containing gas and residual sulfur content in char during CO2 pyrolysis is highly depends on the minerals and sulfur forms in raw coal. Experimental work shows the high CO2 concentrations may promote the CO2 reduction reaction of pyrite and generate more Fe3O4, CO and SO2 [31]. The results of pyrolysis experiment of coal under N2 and CO2 atmosphere by Karaca [32] indicate that CO2 atmosphere has more effects on the organic sulfur removal at high temperatures.…”

Section: Introductionmentioning

confidence: 95%

Nitrogen and sulfur conversion during pressurized pyrolysis under CO 2 atmosphere in fluidized bed

Duan

Anthony

et al. 2017

Fuel

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Pressurized oxy-fuel combustion (POFC) is a promising technology for CO2 capture from coal-fired power plants, offering both high efficiency and a low penalty. However, the high partial pressure of CO2 in a POFC furnace has important impacts on fuel-N and fuelS conversion during the coal pyrolysis process, and understanding this will help to achieve further control of SOx/NOx. In this study, coal pyrolysis experiments were conducted in a pressurized fluidized bed with the pressure range of 0.1-0.7MPa under N2 and CO2 atmosphere. The gaseous products were monitored by a Fourier transform infrared spectroscopy analyzer (FTIR) and the char residue was characterized by an X-ray photoelectron spectroscopy (XPS) analyzer in order to acquire the species information for S-containing and N-containing compounds. Results show that the enrichment of CO2 in the local atmosphere enhances the fuel-N conversion to HCN in the pyrolysis process, which serves as a favorable precursor to N2O. The generation of HCN and NH3 increase simultaneously with the increase of overall pressure. SO2 concentration in the gaseous product is relatively low, and as the pressure increases, the concentration decreases slightly due to CO reduction of SO2 to COS. Sulfur content in the char decreases as the pressure goes from 0.1MPa to 0.7MPa indicating higher CO2 pressure accelerates the decomposition of sulfur compounds in the coal, which is further confirmed by the XPS results.

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Section: Introductionmentioning

confidence: 95%

Nitrogen and sulfur conversion during pressurized pyrolysis under CO 2 atmosphere in fluidized bed

Duan

Anthony

et al. 2017

Fuel

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“…11(a) Figure 11(c) shows that, when the CO content increases to 60 vol.%, the 'S' in Ca 3 Fe 4 S 3 O 6 is mainly transformed to FeS by Eq. (24), which could be further confirmed by the low sulfur removal ratio of 2.35 wt.%. In addition, Fig.…”

Section: Casomentioning

confidence: 66%

“…(1), (2), (3) and 4, which simultaneously produces CaO, CaS, SO 2 (g) and CO 2 (g). [21][22][23][24][25]…”

Section: Transformation Behaviour Of Sulfur From Gypsum Waste (Caso 4mentioning

confidence: 99%

“…The gypsum waste decomposes into SO 2 (g) at a proper temperature, which can sulfurize SnO 2 to SnS in the presence of C or CO(g). 2,5,20,22,24) A method of Sn removal from Sn-bearing iron concentrates using gypsum waste (CaSO 4 •2H 2 O) in mixed gases of CO and CO 2 is proposed in this paper. The transformation behaviour of 'S' in CaSO 4 during the roasting process was mainly researched via thermodynamic, chemical, ICP, XRD, SEM-EDS and EPMA analyses.…”

Section: Casomentioning

confidence: 99%

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Transformation Behaviour of Sulfur from Gypsum Waste (CaSO<sub>4</sub>·2H<sub>2</sub>O) while Roasting with Tin-bearing Iron Concentrate for Tin Removal and Iron Recovery

2020

ISIJ Int.

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Gypsum waste, with CaSO 4 •2H 2 O as the main ingredient, decomposed into SO 2 (g) at a proper temperature, according to previous research. It could sulfurize SnO 2 to SnS(g) in the presence of C or CO(g), based on which a method of roasting with gypsum waste (CaSO 4 •2H 2 O) for removing Sn from Sn-bearing iron concentrates was put forward in this paper. In addition, a traditional curing agent, FeS 2 , was introduced and comparatively studied. With FeS 2 used as the curing agent for tin sulfurization and removal, the FeS generated from the FeS 2 decomposition played a major role through its transformation to SO 2 (g) and COS(g) in mixed gases of 35 vol.%CO and 65 vol.%CO 2. Besides, the COS(g) had a better sulfurization effect on tin than SO 2 (g). The 'S' from gypsum waste (CaSO 4 •2H 2 O) was mainly transformed into FeS and Ca 3 Fe 4 S 3 O 6 upon roasting with tin-bearing iron concentrate in mixed gases of 35 vol.%CO and 65 vol.%CO 2 , both of which could sulfurize Sn(l) to SnS(g) also through their transformation to SO 2 (g) and COS(g). The amount of sulfur added by CaSO 4 •2H 2 O could be decreased compared with that added by FeS 2 due to the higher utilization efficiency of 'S' in CaSO 4 •2H 2 O. This process realized the cyclic utilization of gypsum waste, Sn effective removal and the iron pre-reduction from tin-bearing iron concentrate.

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“…Therefore, differences observed in the formation of Fe-bearing products, under the two combustion atmospheres, could be attributed to the inuence of the higher concentration of CO 2 . Based on a literature survey performed, [28][29][30][31] pyrite in the N 2 atmosphere generally transforms into pyrrhotite, while in the CO 2 atmosphere, magnetite is formed that then turns into hematite. The decomposed products of pyrite may further react with CO 2 to form iron oxides, indicating that CO 2 is further conducive to the transformation of pyrite.…”

Section: Fe-containing Phases Of Ashes Produced From Dtf Experimentsmentioning

confidence: 99%

Investigation on the transformation behaviours of Fe-bearing minerals of coal in O₂/CO₂ combustion atmosphere containing H₂O

Huang

Xin

et al. 2021

RSC Adv.

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Transformation pathway of excluded mineral pyrite decomposition in CO 2 atmosphere

Cited by 33 publications

References 44 publications

Nitrogen and sulfur conversion during pressurized pyrolysis under CO 2 atmosphere in fluidized bed

Nitrogen and sulfur conversion during pressurized pyrolysis under CO 2 atmosphere in fluidized bed

Transformation Behaviour of Sulfur from Gypsum Waste (CaSO<sub>4</sub>·2H<sub>2</sub>O) while Roasting with Tin-bearing Iron Concentrate for Tin Removal and Iron Recovery

Investigation on the transformation behaviours of Fe-bearing minerals of coal in O₂/CO₂ combustion atmosphere containing H₂O

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Transformation pathway of excluded mineral pyrite decomposition in CO 2 atmosphere

Cited by 33 publications

References 44 publications

Nitrogen and sulfur conversion during pressurized pyrolysis under CO 2 atmosphere in fluidized bed

Nitrogen and sulfur conversion during pressurized pyrolysis under CO 2 atmosphere in fluidized bed

Transformation Behaviour of Sulfur from Gypsum Waste (CaSO<sub>4</sub>·2H<sub>2</sub>O) while Roasting with Tin-bearing Iron Concentrate for Tin Removal and Iron Recovery

Investigation on the transformation behaviours of Fe-bearing minerals of coal in O2/CO2 combustion atmosphere containing H2O

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Investigation on the transformation behaviours of Fe-bearing minerals of coal in O₂/CO₂ combustion atmosphere containing H₂O