Efficient removal of phosphate impurities in waste phosphogypsum for the production of cement

Cai, Qiang; Jiang, Jun; Ma, Bing; Shao, Zhi-Gang; Hu, Yueyang; Qian, Binbin; Wang, Luming

doi:10.1016/j.scitotenv.2021.146600

Cited by 53 publications

(13 citation statements)

References 44 publications

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“…On the other hand, the sum of calcium, sulfur, oxygen contents, and loss on ignition (LOI) of total weight of the raw and washed PG are 97.49 % and 97.26 %, respectively. Furthermore, our experimental values are similar to those recently given by other authors such as Cai et al [54] and Liu et al [55]. Generally, the composition and the purity of phosphogypsum depend greatly on the quality, the origin (sedimentary or igneous), the chemical treatment of the phosphate rock and the type of digestion process used for the production of phosphoric acid (dihydrate/hemihydrate process) [56,57].…”

Section: Pg Sample Analysissupporting

confidence: 90%

Continuous and simultaneous conversion of Moroccan phosphogypsum waste to Na2SO4, and K2SO4 using the quaternary system Na+, K+ // Cl-, SO42- - H2O at 25°C

Laaboubi

Bouargane

Pérez-Moreno

et al. 2022

Preprint

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In this present work, the transformation of the Moroccan phosphogypsum (PG) waste, considered as a potential source of sulfate, into potassium sulfate compound could help to reduce environmental impact and to create a new value chain for the phosphate industry. Generally, solidliquid equilibria are frequently applied in chemical industries. They are a valuable aid for visualizing the precipitation, separation, purification of a solid phase and pathways through which crystallization can proceed. The aim of this process is to produce potassium sulfate, a high-value fertilizer, from sulfate solutions obtained after dissolving Moroccan phosphogypsum in NaOH medium. The quaternary phase diagram Na + , K + // Cl - , SO 4 2- - H 2 O at 25°C was especially used to determine the operating conditions and the design of a crystallization process during the phosphogypsum conversion into potassium sulfate. The Jänecke representation of this system enables the determination of the optimal trajectory in the phase diagram for the double decomposition reaction. X-ray Fluorescent (XRF) and X-ray diffraction (XRD) techniques were conducted to identify the crystalline phases formed. The results of this study could be contributing to the development of a sustainable valorization of Moroccan phosphogypsum. Furthermore, the potassium sulfate represents a good alternative to potassium chloride for chloride-sensitive crops.

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Section: Pg Sample Analysissupporting

confidence: 90%

Continuous and simultaneous conversion of Moroccan phosphogypsum waste to Na2SO4, and K2SO4 using the quaternary system Na+, K+ // Cl-, SO42- - H2O at 25°C

Laaboubi

Bouargane

Pérez-Moreno

et al. 2022

Preprint

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“…The initial and final setting time of silicate cement prepared from PG treated with 1% H 2 C 2 O 4 was reduced to 155 min and 220 min, respectively. Furthermore, 3d and 28d compressive strengths of silicate cement prepared from PG treated with 1% H 2 C 2 O 4 were 20.8 and 44.6 MPa, respectively ( Cai et al., 2021 ).…”

Section: Pretreatment Methods Of Pgmentioning

confidence: 99%

Recycling phosphogypsum in road construction materials and associated environmental considerations: A review

Men¹,

Li²,

Cheng³

et al. 2022

Heliyon

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“…The mathematical model is termed a phase change-based thermal equation, simultaneously describing the thermal conduction and thermal storage. Comparing the developed mathematical model with [47], it is inferred that the adopted shell energy analysis is quite a suitable method to entirely describe the phase-change behaviors. For TSTBs, q s is contributed by the sensible heat and latent heat.…”

Section: Numerical Modeling and Analysismentioning

confidence: 99%

“…The TSTBs are composed of phosphogypsum (PG), octadecane (OD), Kaolin clay (KC) and cement (CM) with the main functions of strength improver, thermal storage, form-stabilizer, and intermediate binder, respectively. PG is an industrial waste of phosphoric acid and about 4.8-5 tons of the PG are produced during the production of one ton of phosphoric acid [47]. PG is still at a relatively early stage in terms of finding its vital application on a larger scale.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Analyses of Thermal Storage Tile-Bricks for Efficient Thermal Management of Buildings

et al. 2021

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Due to the tremendous increase in the population and emerging energy crisis, the surging demand for the thermal management of buildings has become essential. Thermal management of buildings is of high importance for maintaining optimum thermal comfort and controlling the drastic environmental impacts. To avoid high energy consumption strategies and continuous operation such as active air heaters and air conditioners, passive strategies driven by phase change material-based thermal storage are expected to leverage the energy challenges. This work attempts to present the form-stabilized thermal storage tile-bricks (TSTBs) that are fabricated by a combination of octadecane, phosphogypsum, kaolin clay and cement. The optimal percent contents of each entity were found with respect to the design criterion of form-stability and effective temperature control capacity. Two TSTBs with a thickness of 10 mm and 15 mm were constructed, which are then applied on ordinary clay bricks to build a prototype wall. The optimal TSTBs are experimentally and numerically evaluated by subjecting them to transient thermal performance analysis, providing longer temperature retardation (~3000 s) compared with ordinary clay bricks (~400 s). It is thus implied that TSTBs can provide a viable solution against energy mismanagement by inhibiting the heating in summer and reserving the cold in winter.

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Efficient removal of phosphate impurities in waste phosphogypsum for the production of cement

Cited by 53 publications

References 44 publications

Continuous and simultaneous conversion of Moroccan phosphogypsum waste to Na2SO4, and K2SO4 using the quaternary system Na+, K+ // Cl-, SO42- - H2O at 25°C

Continuous and simultaneous conversion of Moroccan phosphogypsum waste to Na2SO4, and K2SO4 using the quaternary system Na+, K+ // Cl-, SO42- - H2O at 25°C

Recycling phosphogypsum in road construction materials and associated environmental considerations: A review

Experimental and Numerical Analyses of Thermal Storage Tile-Bricks for Efficient Thermal Management of Buildings

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