“…However, phosphogypsum has also been studied as a potential resource pool, with recent studies suggesting recycling it in the construction industry ( Campos et al, 2017 ; Amrani et al, 2020 ). Agriculture use of phosphogypsum to improve soil structure and crop yield, reduce runoff and decrease soil erosion has also been examined, with some mixed results concerning the safety of phosphogypsum application to soils ( Canova et al, 2018 ). Fig.…”
Phosphorus (P) availability is essential for global food security. A system dynamics model running from 1961 to 2050 was built for this study, linking global P supply to social, economic and environmental dynamics at regional level. Simulation results show that phosphate rock (PR) production needs to double by 2050 compared to present levels, in order to match regional P requirements. South Asia, Latin America and the Caribbean, and Sub-Saharan Africa are regions highly dependent on phosphate imports, yet it is here that most of the population growth and future P requirement will occur. Climate impact, eutrophication and phosphogypsum production are some of the main negative environmental dynamics that are becoming increasingly challenging in the coming decades.
“…However, phosphogypsum has also been studied as a potential resource pool, with recent studies suggesting recycling it in the construction industry ( Campos et al, 2017 ; Amrani et al, 2020 ). Agriculture use of phosphogypsum to improve soil structure and crop yield, reduce runoff and decrease soil erosion has also been examined, with some mixed results concerning the safety of phosphogypsum application to soils ( Canova et al, 2018 ). Fig.…”
Phosphorus (P) availability is essential for global food security. A system dynamics model running from 1961 to 2050 was built for this study, linking global P supply to social, economic and environmental dynamics at regional level. Simulation results show that phosphate rock (PR) production needs to double by 2050 compared to present levels, in order to match regional P requirements. South Asia, Latin America and the Caribbean, and Sub-Saharan Africa are regions highly dependent on phosphate imports, yet it is here that most of the population growth and future P requirement will occur. Climate impact, eutrophication and phosphogypsum production are some of the main negative environmental dynamics that are becoming increasingly challenging in the coming decades.
“…For a long time, PG can only be piled up at random, which occupies a large amount of land. The pollutants in the PG are easy to seep out, which will pollute the water and the surrounding environment (Tayibi et al, 2009;Canovas et al, 2018). In addition, it can form dust and cause very serious environmental problems in the local area (Xue et al, 2019;Xu et al, 2019;Hartley et al, 2013).…”
Phosphogypsum is an industrial solid waste from the phosphate fertilizer industry. At present, the accumulation of phosphogypsum has caused very serious economic and environmental problems. A large scale of phosphogypsum is consunmed in the building field. The characteristics of whiteness and phosphorus content are important factors affecting the use of phosphogypsum as a building material. In this study, soluble phosphorus and fluorine were removed by adding lime, and flotation was employed to purify phosphogypsum. A large amount of organic matter and fine slime in the phosphogypsum were removed by reverse flotation, and gypsum was floated by positive flotation. Through the flotation closed-circuit experiment, the whiteness of phosphogypsum was increased from 31.5 to 58.4, the percentage of total phosphorus in gypsum (P2O5) was reduced from 1.78 to 0.89, the grade of calcium sulphate dihydrate was 96.6%, the recovery of concentrate was 74.1%. After removing impurities, the phosphogypsum concentrate reached the first grade national standard of the phosphogypsum building materials in China. The method is cheap and practical, and can be used as an important method for pretreatment of phosphogypsum.
“…Industrial phosphogypsum (I-PG) is mainly composed of calcium sulfate dihydrate (CaSO 4 $2H 2 O) and it is the main byproduct of the production process of phosphoric acid. [1][2][3] Annual emissions of I-PG around the world have exceeded one billion tons over the last three years and the huge amount of I-PG not only occupies farmland but also causes severe pollution of the surrounding environment. 3 In recent years, high-value utilization of I-PG has drawn signicant attention and so far, the most effective way to achieve high-value utilization of I-PG is to produce a-calcium sulphate hemihydrate (a-CaSO 4 $0.5H 2 O).…”
Section: Introductionmentioning
confidence: 99%
“…[1][2][3] Annual emissions of I-PG around the world have exceeded one billion tons over the last three years and the huge amount of I-PG not only occupies farmland but also causes severe pollution of the surrounding environment. 3 In recent years, high-value utilization of I-PG has drawn signicant attention and so far, the most effective way to achieve high-value utilization of I-PG is to produce a-calcium sulphate hemihydrate (a-CaSO 4 $0.5H 2 O). [4][5][6] To date, methods for preparing a-CaSO 4 $0.5H 2 O crystals from CaSO 4 $2H 2 O mainly include autoclave hydrothermal, [7][8][9][10] atmospheric salt solution, [11][12][13][14] reverse microemulsion 15 and alcohol-water solution.…”
The conversion of industrial gypsum to rod-shaped α-CaSO4·0.5H2O crystals with tunable aspect ratio in a H2O system is realized with potassium tartrate.
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