TG-FTIR and Py-GC/MS combined with kinetic model to study the pyrolysis characteristics of electrolytic manganese residue

Duan, Jiangfei; Feng, Shengxia; He, Weilong; Li, Rui; Zhang, Peng

doi:10.1016/j.jaap.2021.105203

Cited by 15 publications

(4 citation statements)

References 20 publications

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“…As can be seen from Fig. 9, the activation energies calculated by the FWO and KAS models have similar trends with conversion, but fluctuate considerably, indicating that the PG reduction process is a complex reaction process 25 . As evident from Table 6, E a calculated by the FWO method is slightly higher than that calculated by the KAS method.…”

Section: Resultsmentioning

confidence: 69%

“…9, the activation energies calculated by the FWO and KAS models have similar trends with conversion, but fluctuate considerably, indicating that the PG reduction process is a complex reaction process. 25 As evident from Table 6, E a calculated by the FWO method is slightly higher than that calculated by the KAS method. The different approximation formulas chosen for the temperature integration function P(x) are the reason for the deviation of E a calculated by the two methods from A.…”

Section: Kinetic Analysismentioning

confidence: 75%

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Experimental study of CaS preparation from lignite‐reduced phosphogypsum in a fluidized bed

Wang

2022

J of Chemical Tech & Biotech

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BACKGROUND: Phosphogypsum (PG) is a solid waste. For a fluidized bed, current research has focused on the preparation of CaO and SO 2 by PG decomposition, while less research has been conducted with calcium sulfide (CaS) as the target product. Therefore, the effect of different conditions on the preparation of CaS by coal reduction of PG was investigated in a fluidized bed. The mechanism of the reaction between coal and PG was revealed through experiments and kinetic calculations.RESULTS: PG decomposition is a combination of solid-solid reaction (carbon reacting with CaSO 4 ) and gas-solid reaction (reducing gas reacting with CaSO 4 ), among which the solid-solid reaction plays a major role. A PG decomposition rate of 99.42% and CaS yield of 91.55% are obtained at 850 °C for 60 min when the Ca/C molar ratio is less than 0.25 and coal particle size is less than 0.075 mm. Lignite, bituminous coal and anthracite can promote the decomposition of PG. However, the higher viscosity of bituminous coal can lead to molten coking of the product, while anthracite is less economical, so lignite is the most suitable. Minerals in coal can improve the decomposition rate of PG. A fluidized bed improves the PG decomposition rate compared to a fixed bed.CONCLUSIONS: CaS is obtained by combined solid-solid and gas-solid reactions. Decreasing the Ca/C ratio and coal particle size as well as controlling the reaction temperature below 850 °C are beneficial for CaS generation. The minerals in coal can reduce the PG decomposition temperature and increase the PG decomposition rate.

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Section: Resultsmentioning

confidence: 69%

Section: Kinetic Analysismentioning

confidence: 75%

Experimental study of CaS preparation from lignite‐reduced phosphogypsum in a fluidized bed

Wang

2022

J of Chemical Tech & Biotech

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“…The regions of 1900–2200 cm –1 are the stretching vibration peaks of the CO bond in CO, , which are generated by the pyrolysis and gasification of anthracite and the decomposition of PG. When the temperature is higher than 800 °C, the characteristic peak of SO 2 is at 1344 cm –1 , , which is caused by the gas–solid reaction and the solid–solid reactions and . It means that SO 2 escapes during the decomposition process and produces intermediate product CaO, and part of CaO is consumed in the latter reaction.…”

Section: Resultsmentioning

confidence: 99%

Study on the Effect of the Activity of Anthracite on the Decomposition of Phosphogypsum

Liang

Yang

et al. 2022

Ind. Eng. Chem. Res.

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In this paper, a thermogravimetric analyzer with Fourier transform infrared spectroscopy (TG-FTIR), pyrolysis device and gas chromatography (Py-GC), and kinetic models were used to study the effect of anthracite with different activities on the decomposition of phosphogypsum (PG) and the reaction mechanism was analyzed. The results show that the decomposition rate of PG is affected by the CO partial pressure and the thickness of the decomposition product layer, and the high-activity anthracite has a high decomposition rate of PG. It mainly contains CO, CO 2 , and SO 2 in the decomposition process, while the solid products are mainly CaS, CaO, and Ca 2 SiO 4 . According to the kinetic calculation results at 800−1100 °C, it can be divided into three stages, namely, the one-dimensional diffusion model based on the solid−solid reaction, the two-dimensional diffusion based on the gas−solid reaction model, and the nucleation and growth model of CaO.

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“…16 The present study aimed to evaluate the pyrolysis behavior and kinetic parameters of phosphate tailings using thermogravimetry (TG) combined with the Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) multiple heating rate methods. We also clarify the possible reaction mechanism of the pyrolysis process using the Criado method 22,23 (integral principal curve method). Additionally, we used Fourier transform infrared spectroscopy-Raman spectroscopy-mass spectrometry (TG-FTIR-RS-MS) combined technology to investigate phosphate tailings pyrolysis and the distribution of released volatiles with temperature change, providing a theoretical model for the recycling of phosphate tailings.…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric and spectroscopic analyses along with the kinetic modeling of the pyrolysis of phosphate tailings

et al. 2023

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TG-FTIR and Py-GC/MS combined with kinetic model to study the pyrolysis characteristics of electrolytic manganese residue

Cited by 15 publications

References 20 publications

Experimental study of CaS preparation from lignite‐reduced phosphogypsum in a fluidized bed

Experimental study of CaS preparation from lignite‐reduced phosphogypsum in a fluidized bed

Study on the Effect of the Activity of Anthracite on the Decomposition of Phosphogypsum

Thermogravimetric and spectroscopic analyses along with the kinetic modeling of the pyrolysis of phosphate tailings

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