Effect of SiO2 on the melting characteristics of reaction between phosphogypsum and calcium sulfide

Shi, Ting; Wan, Tianming; Zhang, Zhiye; Yang, Xiushan; Yang, Lin; Zhong, Benhe; Kong, Xingjian; Wang, Xin-Long

doi:10.1007/s10973-015-5032-z

Cited by 18 publications

(19 citation statements)

References 23 publications

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“…The weight loss of the subsequent three stages that occurred in the range from 410 °C to 1358 °C are 2.50%, 3.75%, and 43.00% (shown in Table 2), respectively. The weight loss of 6.25% (2.50% + 3.75%) in TG curve is attributed to both of these reactions (R 2 –R 4 ) 10,31 and the ignition loss of PG or coke in the range from 410 °C to 902 °C. The lower weight loss appeared at 1150 °C, which is attributed to the reaction between CaSO 4 and intermediate production of CaS (R 5 ) 10,32 .…”

Section: Resultsmentioning

confidence: 99%

Effect of potassium feldspar on the decomposition rate of phosphogypsum

Chen

et al. 2020

J of Chemical Tech & Biotech

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BackgroundPhosphogypsum (PG) is a solid waste from a wet process of phosphoric acid and its main component is CaSO4·2H2O. However, the temperature of PG decomposition is above 1200 °C. In this study, the decomposition temperature of PG was decreased using a small amount of coke as reducing agent, and the decomposition rate of PG can be further increased using potassium feldspar (K‐feldspar) as an additive to form a eutectic mixture with PG in nitrogen atmosphere.ResultsA high PG decomposition rate of 99.40% was obtained at 1150 °C for 25 min, when the mass ratio of coke to PG and K‐feldspar to PG was 0.07 and 0.43, respectively. Compared with the addition of coke alone (coke/PG = 0.07) as the reducing agent, the decomposition rate of PG was increased by 35.40%. The HSC Chemistry software 8 was used to calculate the equilibrium compositions of the PG @K‐feldspar @coke system, and the decomposition rate of 99.77% was obtained at 1150 °C by calculation. The experimental results are basically consistent with the thermodynamic equilibrium calculation.ConclusionThe PG and K‐feldspar are fully utilized by calcination. The decomposition reaction of PG can proceed via the continuous consumption of CaO and CaS by K‐feldspar, which increased the decomposition rate of PG. The thermodynamic calculation results showed a good agreement between the equilibrium value calculated and the experimental data obtained. Furthermore, the calcined products can be used as an agricultural potassium fertilizer. © 2020 Society of Chemical Industry (SCI)

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Section: Resultsmentioning

confidence: 99%

Effect of potassium feldspar on the decomposition rate of phosphogypsum

Chen

et al. 2020

J of Chemical Tech & Biotech

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“…in PG acted as the effective substances to promote the reductive decomposition of PG [13]. In PG decomposition residue, different chemical components are formed in different decomposition conditions [18]. Moreover, many constituents such as fluoride and radioactive substance in PG residue, are detrimental to environment, and will be the main constraint on resource utilization of PG [15].…”

Section: Introductionmentioning

confidence: 99%

“…Nevertheless, some constituents such as K 2 SiO 3 and Ca 2 SiO 4 in PG were useless [14]. are also tested in PG decomposition residue [18,19]. The current research on this area is only focus on the investigation of the effect and detection method of radioactive fluoride [16,17].…”

Section: Introductionmentioning

confidence: 99%

“…The current research on this area is only focus on the investigation of the effect and detection method of radioactive fluoride [16,17]. In PG decomposition residue, different chemical components are formed in different decomposition conditions [18]. CaO is known as the main decomposition product of PG, which decomposes in a higher temperature, and many components such as Fe 2 O 3 , SiO 2 , Al 2 O 3 , CaSiO 3 , CaSO 4 , radioactive fluoride, etc.…”

Section: Introductionmentioning

confidence: 99%

“…CaO is known as the main decomposition product of PG, which decomposes in a higher temperature, and many components such as Fe 2 O 3 , SiO 2 , Al 2 O 3 , CaSiO 3 , CaSO 4 , radioactive fluoride, etc. are also tested in PG decomposition residue [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Analyses on the application of components in the phosphogypsum decomposition residue: Based on the study of migration and conversion rules of elements in the purification procedure of CaO

Dai

Xie

et al. 2017

Env Prog and Sustain Energy

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Phosphogypsum (PG), which is a solid waste in phosphate fertilizer industry, is harmful to the environment. The pyrogenetic decomposition is mainly used in the utilization of PG, and PG decomposition residue is produced in the decomposition process. In this paper, the migration and conversion rules of elements (Al, Si, P, K, Ca, and Fe) in the purification procedure of CaO in PG decomposition residue was investigated. The acid–base method was used to purify CaO. Content and chemical forms of elements in the purification procedure were analyzed by many characterization methods such as SEM and EDS. And moreover, changes on chemical forms of elements were supported theoretically by some ternary phase diagrams, which were made by the FactSage thermodynamics software. The result showed that, the soluble silicon dioxide and the acid‐insoluble material in PG decomposition residue were effectively removed by using the acid–base method. Meanwhile, impurities separated from CaO and the CaO sample were produced in the experiment, the former can be used to produce the building materials, refractories, insulating materials in various industrial fields, and CaO sample could be used as the filler, building materials, decolorant, etc. © 2017 American Institute of Chemical Engineers Environ Prog, 37: 1020–1030, 2018

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Reaction characteristics and kinetics of phosphogypsum decomposition via synergistic reduction effect of composite reducing agent

Liu

Chen

et al. 2022

J Mater Cycles Waste Manag

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Effect of SiO2 on the melting characteristics of reaction between phosphogypsum and calcium sulfide

Cited by 18 publications

References 23 publications

Effect of potassium feldspar on the decomposition rate of phosphogypsum

Effect of potassium feldspar on the decomposition rate of phosphogypsum

Analyses on the application of components in the phosphogypsum decomposition residue: Based on the study of migration and conversion rules of elements in the purification procedure of CaO

Reaction characteristics and kinetics of phosphogypsum decomposition via synergistic reduction effect of composite reducing agent

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