An experimental study of CaSO 4 decomposition during coal pyrolysis

Jia, Xin; Wang, Qinhui; Cen, Kefa; Chen, Leming

doi:10.1016/j.fuel.2015.09.054

Cited by 64 publications

(27 citation statements)

References 29 publications

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“…The high residual mass at 1,000 °C (24.3 %) suggests that the mineral contains sulfate group, probably CaSO 4 , among other inorganic components. Calcium sulfate is very stable and only a small part was decomposed below 600 °C (Jia et al, 2016).…”

Section: Hydrogel Characterizationmentioning

confidence: 99%

Hydrogel composed of potassium acrylate, acrylamide, and mineral as soil conditioner under saline conditions

Costa

Freire

Lourenço

et al. 2022

Sci. agric. (Piracicaba, Braz.)

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Hydrogels have potential as soil conditioners due to their high capacity to retain water and mitigate soil salinity. However, investigations under saline conditions are necessary because there are losses in both water absorption and salinity mitigation depending on the composition of hydrogel and ions involved in salinity. In this work, we studied a commercial hydrogel in two experiments. The first experiment was conducted in the laboratory to evaluate the absorption by the hydrogel of water with electrical conductivity (EC) of 0.5, 1.5, 3.0, and 4.5 dS m -1 , promoted by NaCl. The second experiment was conducted in a greenhouse in a 2 × 4 factorial scheme (with and without hydrogel × EC of the first experiment). Although salinity reduced water absorption by hydrogel by 84 %, the polymer applied in a sandy soil under saline conditions reduced water losses by 58 %. However, hydrogel did not increase the final soil moisture (~ 0.10 g g -1 ). The polymer reduced Na + concentration in leachate from 1,499 to 1,219 mg L -1 at the highest salinity level (4.5 dS m -1 ), but it increased Na + soil availability by 0.1 mg kg -1 in comparison with polymer absence. Hydrogel application increased Na + content in plants from 9 to 13 mg kg -1 at the highest salinity, while K + content was 10 to 16 mg kg -1 lower than that observed without a polymer. Hydrogel 0.07 % (w/w) reduced maize biomass, indicating damage by monovalent ions, compromising the polymer potential under salinity.

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Section: Hydrogel Characterizationmentioning

confidence: 99%

Hydrogel composed of potassium acrylate, acrylamide, and mineral as soil conditioner under saline conditions

Costa

Freire

Lourenço

et al. 2022

Sci. agric. (Piracicaba, Braz.)

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“…(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%

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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“…The deviation between simulation and actual industrial condition is expressed by the Murphree efficiency [42]. For the wastewater stripper, the following assumptions are made: Murphree efficiencies for NH 3 Figure 6. Flowsheet of the wastewater treatment process for phenol and ammonia recovery.…”

Section: Wastewater Treatmentmentioning

confidence: 99%

“…Briefly, the former integrates coal or coal water slurry gasification with coal gas further deep processing. The latter, namely the coal staged conversion polygeneration (CSCP) process, combines coal pyrolysis and char combustion, and can upgrade remarkably the value of comprehensive utilization of coal under relatively mild conditions . Compared with the coal gasification‐based polygeneration system, the coal pyrolysis‐based staged conversion process allows the co‐production of electricity, oil, and chemicals.…”

Section: Introductionmentioning

confidence: 99%

Techno‐Economic Analysis of a Coal Staged Conversion Polygeneration System for Power and Chemicals Production

Wang

Shaikh

et al. 2018

Chem Eng & Technol

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Steady‐state process simulation and techno‐economic analysis of a pyrolysis‐based coal staged conversion polygeneration (CSCP) plant, integrated with wastewater biochemical treatment after phenol‐ammonia recovery, are studied using Aspen Plus software. Appropriate models for the proposed system are set up in detail. Furthermore, by optimization of a methanation unit, a conventional supercritical circulating fluidized bed (SCCFB) power plant with the same capacity is chosen for comparison. Simulation results reveal that system energy and exergy efficiency of the CSCP system can reach much higher values than those of a conventional SCCFB power plant. In conclusion, a CSCP plant will have practical and economic advantages in the near future.

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An experimental study of CaSO 4 decomposition during coal pyrolysis

Cited by 64 publications

References 29 publications

Hydrogel composed of potassium acrylate, acrylamide, and mineral as soil conditioner under saline conditions

Hydrogel composed of potassium acrylate, acrylamide, and mineral as soil conditioner under saline conditions

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

Techno‐Economic Analysis of a Coal Staged Conversion Polygeneration System for Power and Chemicals Production

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