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

Men, Jiahui; Li, Yiming; Cheng, Po-Tai; Zhang, Zhanming

doi:10.1016/j.heliyon.2022.e11518

Cited by 26 publications

(8 citation statements)

References 112 publications

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“…The authors of [ 12 ] worked on obtaining a durable composite material based on phosphogypsum for construction use. Research [ 13 ] discusses the prospects of using phosphogypsum in road surface production. In studies [ 14 , 15 , 16 , 17 ], it was proposed to use phosphogypsum in chemical ring gasification processes, including synthesis gas production.…”

Section: Introductionmentioning

confidence: 99%

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Studying the Process of Phosphogypsum Recycling into a Calcium Sulphide-Based Luminophor

Medennikov,

Egorova,

Shabelskaya

et al. 2024

Nanomaterials

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Currently, one of the most important problems of environmental protection is the deep and complex processing of mineral raw materials. This problem is especially relevant when processing substandard ores and production waste, one of which is phosphogypsum. This study examines the process of CaSO4/CaS composite material formation during the reduction of phosphogypsum with citric acid. The composite structure formation mechanism is proposed. The resulting materials are characterized using various methods, including X-ray diffraction (XRD), transmission electron microscopy, the Scherrer method, thermogravimetric analysis (TGA), and FT-IR spectroscopy. The reduced sample emits orange radiation in the range of 500–750 nm with a quantum yield of 0.17. Experimental results showed that the sample decomposition process in the solid state consisted of two components with a predominant contribution from the long-lived component (~46 ns). The optimal conditions for producing luminescent materials by reducing phosphogypsum with citric acid were determined: a heat treatment temperature of 1073 K, a holding time of 60 min, and a reducing agent mole fraction of 37%. It was found that an increase in temperature with a simultaneous decrease in heat treatment time, as well as a decrease in temperature with a simultaneous increase in heat treatment time, led to a decrease in the luminescent properties of the synthesized material compared to optimal values. The results can be used to develop technology for recycling large-tonnage waste from the chemical industry into luminescent materials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Studying the Process of Phosphogypsum Recycling into a Calcium Sulphide-Based Luminophor

Medennikov,

Egorova,

Shabelskaya

et al. 2024

Nanomaterials

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“…In the building materials, the industrial byproduct gypsum is mainly used in the production of cement retarders, gypsum slats, gypsum bricks, gypsum blocks, etc. In recent years, new gypsum products, such as self-leveling gypsum, α-type high-strength gypsum, ii-type anhydrous gypsum, and calcium sulfate whiskers, have also been developed [9,10]. In addition, the industrial byproduct gypsum is used in road construction, filling and other applications [2,11].…”

Section: Introductionmentioning

confidence: 99%

Application of the Industrial Byproduct Gypsum in Building Materials: A Review

Xie,

Liu,

Zhang

et al. 2024

Materials

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The industrial byproduct gypsum is a general term for byproducts discharged from industrial production with calcium sulfate as the main ingredient. Due to the high number of impurities and production volume, the industrial byproduct gypsum is underutilized, leading to serious environmental problems. At present, only desulfurization gypsum and phosphogypsum have been partially utilized in cementitious materials, cement retarders, etc., while the prospects for the utilization of other byproduct gypsums remain worrying. This paper mainly focuses on the sources and physicochemical properties of various types of gypsum byproducts and summarizes the application scenarios of various gypsums in construction materials. Finally, some suggestions are proposed to solve the problem of the industrial byproduct gypsum. This review is informative for solving the environmental problems caused by gypsum accumulation.

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“…In pavement engineering, calcium sulfate whiskers are used to improve the performance of road materials [10,11]. K. Cao et al evaluated the mechanical properties and microstructure of calcium-sulfate-whisker-modified cement-based composites.…”

Section: Introductionmentioning

confidence: 99%

Experimental Evaluation of the Properties of Asphalt Binders Modified with Calcium Sulfate Anhydrous Whiskers and Polyester Fibers

Fan,

Si,

Gao

2023

Coatings

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The use of waste calcium sulfate whiskers in pavement construction is cost-effective and beneficial to the environment. In this paper, modified asphalt binders are prepared by adding calcium sulfate anhydrous whiskers (ACSW, 9 wt.%,11 wt.%, and 13 wt.% by weight of asphalt binder) and polyester fibers (4 wt.%,6 wt.%, and 8 wt.% by weight of asphalt binder). The viscosity-temperature, rheological, and low-temperature properties of the modified asphalt binder were evaluated using the Brookfield rotational viscosity test, the dynamic shear rheometer (DSR) test, the bending beam rheometer (BBR) test, and the force ductility test. The results demonstrated that the addition of the ACSW and polyester fiber could improve the anti-deformation and low-temperature properties of the asphalt binders, but reduce their viscosity-temperature properties to some extent. The modified asphalt binder with 11 wt.% ACSW and 8% polyester fiber showed the best anti-deformation property, while the 11 wt.% ACSW and 6 wt.% polyester fiber modified asphalt binder had a better low-temperature performance. The force ductility test was more suitable than the BBR test to characterize the low-temperature properties of the modified asphalt binders. The Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) tests were conducted to study the functional groups and micro-structure of the modified asphalt binders, and the results indicated that no new functional groups were generated and that the interaction between the ACSW, polyester fiber, and asphalt binder was a physical adsorption and interleaving process.

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

Cited by 26 publications

References 112 publications

Studying the Process of Phosphogypsum Recycling into a Calcium Sulphide-Based Luminophor

Studying the Process of Phosphogypsum Recycling into a Calcium Sulphide-Based Luminophor

Application of the Industrial Byproduct Gypsum in Building Materials: A Review

Experimental Evaluation of the Properties of Asphalt Binders Modified with Calcium Sulfate Anhydrous Whiskers and Polyester Fibers

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