New insight into investigation of reduction of desulfurization ash by pyrite for clean generation SO2

Song, Weiming; Zhou, Jianan; Wang, Bao; Li, Shu; Han, Jun

doi:10.1016/j.jclepro.2020.120026

Cited by 27 publications

(5 citation statements)

References 54 publications

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“…Sustainability 2023, 15, x FOR PEER REVIEW 2 of 18 as construction materials [18], extraction of chemical products [19][20][21], calcium sulfate whiskers manufacture [22], soil remediation [23], and so on. Despite the huge production of gypsum by-products, their utilization rate in China is very low, approximately 72% for desulfurization gypsum [24], 40% for phosphogypsum [14] and less than 10% for red gypsum [25].…”

Section: Chemical Composition Of Industrial By-product Gypsum and Pri...mentioning

confidence: 99%

“…Similarly, in the EU and the US, phosphogypsum from fertilizer production is a gigantic deal [17]. The major components and chemical properties of by-product gypsum are identical to those of natural gypsum, and it has been extensively researched for usage Sustainability 2023, 15, 9629 2 of 16 as construction materials [18], extraction of chemical products [19][20][21], calcium sulfate whiskers manufacture [22], soil remediation [23], and so on. Despite the huge production of gypsum by-products, their utilization rate in China is very low, approximately 72% for desulfurization gypsum [24], 40% for phosphogypsum [14] and less than 10% for red gypsum [25].…”

Section: Introductionmentioning

confidence: 99%

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Progress in the Preparation of Calcium Carbonate by Indirect Mineralization of Industrial By-Product Gypsum

Wang

et al. 2023

Sustainability

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To avoid the long-term pollution of land and water by industrial gypsum by-products, the exploitation of this resource has become a priority. The indirect synthesis of calcium carbonate from the industrial by-product gypsum has received substantial attention as a viable method for resource utilization. Currently, the primary problems in the indirect manufacture of calcium carbonate from the industrial by-product gypsum are additive recycling and process simplification. This paper describes the present state of development and compares various indirect mineralization systems. The factors affecting leaching and mineralization in the indirect mineralization of CO2 from by-product gypsum and the management of CaCO3 crystallinity are discussed, and the current additive regeneration cycle is summarized. The applications of other technologies in the indirect mineralization of by-product gypsum are also summarized, as are the obstacles, and required future work. This review provides guidelines for the laboratory indirect mineralization of by-product gypsum as well as practical applications.

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Section: Chemical Composition Of Industrial By-product Gypsum and Pri...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Progress in the Preparation of Calcium Carbonate by Indirect Mineralization of Industrial By-Product Gypsum

Wang

et al. 2023

Sustainability

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“…The emission characteristics indicated water vapor in the flue gas, which indirectly leads to large quantities of salt pollutants entrained in the flue gas. The EGA-MS analysis showed that nitrate sulfate could be decomposed and ammonia, SO 2 , and water vapor are released as reaction products in the form of gas [ 270 , 271 ].…”

Section: Applications To Sulfurmentioning

confidence: 99%

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

et al. 2022

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Advances in on-line thermally induced evolved gas analysis (OLTI-EGA) have been systematically reported by our group to update their applications in several different fields and to provide useful starting references. The importance of an accurate interpretation of the thermally-induced reaction mechanism which involves the formation of gaseous species is necessary to obtain the characterization of the evolved products. In this review, applications of Evolved Gas Analysis (EGA) performed by on-line coupling heating devices to mass spectrometry (EGA-MS), are reported. Reported references clearly demonstrate that the characterization of the nature of volatile products released by a substance subjected to a controlled temperature program allows us to prove a supposed reaction or composition, either under isothermal or under heating conditions. Selected 2019, 2020, and 2021 references are collected and briefly described in this review.

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“…The migration and transformation of sulfur in pyrite involves metallurgy, sulfuric acid preparation, coal burning, oil shale utilization and other industrial applications [3][4][5]. Most iron ore in China is rich in sulfur, and a series of physical and chemical transformations occur during the roasting process [6,7], which often leads to the high sulfur content of the iron concentrate produced and an excessive concentration of SO 2 in flue gas dispersed into the environment [8,9]. Oxidizing roasting is an alternative method for the treatment of sulfur in pyrite, the principle and purpose of which is to oxidize the pyrite at high temperatures to release sulfur to reduce its content in the iron concentrate [10], thus reducing the cost of subsequent blast furnace ironmaking.…”

Section: Introductionmentioning

confidence: 99%

Study on the Migration and Release of Sulfur during the Oxidizing Roasting of High-Sulfur Iron Ore

Chen,

Zhao,

et al. 2024

Minerals

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In China, most of the high-sulfur iron ores have not been fully developed and utilized due to the lack of breakthrough progress in the research on the sulfur migration and the desulfurization mechanism during the roasting process. This study will focus on revealing the release and fixation mechanisms of sulfur during the roasting process to achieve the transformation of desulfurization from terminal treatment to process control. Experimental results show that as the roasting temperature increases, the release rate of SO2 also increases, reaching the maximum release rate at 900 °C. Simultaneously, it is found that at the same roasting temperature, the release rate and amount of SO2 under the O2/N2 atmosphere is significantly greater than that under the pure N2 and air atmospheres. Meanwhile, X-ray diffraction (XRD) is utilized to explore the phase composition of the roasted product and the sulfur release mechanism. In addition, the adsorption energy, stability and electron transfer of SO2 on the CaO surface are calculated through density functional theory (DFT), and the optimal adsorption active site perpendicular to the O atom (O-top) is also determined. Finally, the sulfur fixing agent CaO is used to study the SO2 fixation mechanism. When the concentration reaches 10%, the sulfur fixation efficiency reaches more than 80%. Therefore, this work will present basic knowledge and systematic guidance for the sulfur migration and release of high-sulfur iron ore under the oxidizing roasting process.

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New insight into investigation of reduction of desulfurization ash by pyrite for clean generation SO2

Cited by 27 publications

References 54 publications

Progress in the Preparation of Calcium Carbonate by Indirect Mineralization of Industrial By-Product Gypsum

Progress in the Preparation of Calcium Carbonate by Indirect Mineralization of Industrial By-Product Gypsum

On-Line Thermally Induced Evolved Gas Analysis: An Update—Part 1: EGA-MS

Study on the Migration and Release of Sulfur during the Oxidizing Roasting of High-Sulfur Iron Ore

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