Preparation and properties of phosphogypsum-based …
Nowadays, nearly 300 million tons of phosphogypsum (PG) are produced every year in the world, of which China accounts for 1/4 of this amount, ranking first in the world [1], [2], [3].In China, the total stockpile of PG exceeds 700 million tonnes and is steadily increasing every year [4], [5].The primary solid waste generated in the wet phosphoric acid process is known as …
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Application of machine learning algorithm in the internal …
External and internal hazards from industrial byproducts are modelled using MLA. ... Due to the higher concentrations of 226 Ra and 40 K, the findings demonstrated that the calculated internal and external risks in phosphogypsum were more than the world population-weighted average value of 1, posing environmental and health risks. Nevertheless ...
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Determination of internal and external hazard index of …
The highest radioactivity in the sample was 5.808 Bq/L from K-40 and the lowest was 0.103 Bq/L from Bi-214. The internal and external hazard index has been determined where the internal hazard index was 0.013-0.023 while the external hazard index was 0.006-0.012 which is below the maximum hazard index value based on UNSCEAR which is ⩽ 1.
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Environmental Impact of Phosphogypsum-Derived Building …
In this way, it is possible to determine how the most hazardous components of phosphogypsum behave during procedures until their stabilization through CO 2 fixation. This study provides an initial estimate of the possibilities of reusing the resulting products from a health and safety risk …
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Phosphogypsum
In addition to radionuclides, phosphogypsum contains some trace contaminants which may pose health and environmental hazards, such as arsenic, lead, cadmium, chromium, fluorine, zinc, …
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Radiological characterization of phosphate rocks, phosphogypsum …
Additionally, the radiological parameters such as the gamma radiation hazard index, the internal and external hazard index as well as the outdoor and indoor absorbed gamma dose rates. The corresponding annual effective dose rates and the total excess lifetime cancer risk (ELCR) were also estimated to discuss the radiological hazard.
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Recycling phosphogypsum to produce artificial lightweight …
As a typical industrial solid waste, phosphogypsum (PG) is a by-product of wet-process phosphoric acid industry. Approximately 4–6 tons of PG is generated for producing 1 ton of phosphoric acid (Wu et al., 2022).According to the statistics, more than 300 million tons of PG are produced each year in the world, and about 30% of which are produced in China.
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Assessment Of Natural Radioactivity Concentration and …
Estimated radiological hazard indices showed that the mean values of Radium Equivalent, External and Internal Hazards, Absorbed dose rate, Annual Effective Dose, Excess lifetime cancer risk and ...
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Production Waste Management: Qualitative and Quantitative
Phosphogypsum (PG: CaSO4·2H2O) is a waste product (or by-product) from the production of phosphoric acid, the main component in the production of concentrated simple and complex fertilizers.
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- PHOSPHOGYPSUM: SHOULD WE JUST LET IT GO TO …
[House Hearing, 108 Congress] [From the U.S. Government Publishing Office] PHOSPHOGYPSUM: SHOULD WE JUST LET IT GO TO WASTE? PARTS 1 AND 2
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A review on the environmental impact of phosphogypsum …
Here we provide an overview and evaluation of the geochemical and radiological hazardous risks associated with the different uses of PG. In this review, we show that NPs are …
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Radiation hazard indices in the application of …
BJRS BRAZILIAN JOURNAL OF RADIATION SCIENCES 07-03 (2019) 01-13 ISSN: 2319-0612 Accepted: Radiation hazard indices in the application of phosphogypsum mixtures as a building material ...
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(PDF) Correction to: Phosphate, phosphoric acid and phosphogypsum …
The internal and external hazard index has been determined where the internal hazard index was 0.013-0.023 while the external hazard index was 0.006-0.012 which is below the maximum hazard index ...
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Phosphogypsum Sheathing Panels Study on Lateral …
phosphogypsum emissions can reach 100-280 Mt per year [2-4]. The world phosphogypsum stockpile will reach 2 ~ 2.5×1011t in 2030. However, the low utilization rate of phosphogypsum is a worldwide problem, and only 15 % of phosphogypsum is recycled. Most unused phosphogypsum is piled in low-lying pits or other land.
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Review Article Recent research in utilization of …
About 85% of all PG is often dumped into massive mounds without being processed, exposing it to occupying a large area of land, weathering processes, causing significant harm …
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Compressive performance of non-fired phosphogypsum …
This study investigates the possible use of phosphogypsum, a substantial byproduct of phosphate fertilizers, as a green building material. With an estimated yearly …
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Environmental Impact of Phosphogypsum-Derived Building …
Schemes of both chemical processes. 2.1. Procedure A 2.1.1. Synthesis. Lime putty was obtained by using the Cárdenas–Escudero method [], with some modifications to scale the generation of by-products.In the first stage, 300 g of PG was suspended in 500 mL of distilled H 2 O under magnetic stirring. To this suspension, 180 g of NaOH in a 9 M solution was slowly added to …
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Phosphogypsum Stacks: Formation, Risks, and Remediation
Phosphogypsum stacks, byproducts of phosphate fertilizer production, have garnered attention due to their environmental and health implications. These mounds are …
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Pressed non-fired bricks from phosphogypsum waste for non-load bearing wall
The phosphogypsum (factory .Over 6 million tons of PG is produced per annum in India and poses various environmental and storage problems. Out of these some quantities are utilized for of production of ammonium sulphate and few for other uses, there is accumulated stock of PG) is the industrial waste by-product produced in various industries like fertilizer industry, phosphate …
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CN114853437A
The phosphogypsum-based light plastering gypsum for the hollow internal mold metal mesh wall comprises, by mass, 50-450 parts of a gypsum high-strength agent, 50-450 parts of a gypsum water-resistant agent, 50-120 parts of sodium bentonite, 50-250 parts of vitrified micro bubbles or 50-200 parts of calcined ceramic particles, 50-200 parts of an anti-sagging agent, 1800 parts of …
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Rare earth elements characterization associated to the …
This is the first study on the behavior and industrial fluxes of rare earth elements (REE) in the coastal fertilizer plants of Gabes (south-eastern Tunisia), the economic losses related to their wastes, and their environmental and human health hazards. The concentrations of 16 REE were assessed in phosphate rock (PR), phosphogypsum (PG) and phosphogypsum …
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Durability assessment of a confinement cut-off wall for a …
mixtures to be used for a cut-off wall to isolate a phosphogyp-sum landfill and the very acidic leachate of the landfill. 2 SITE DESCRIPTION AND REMEDIATION DESIGN The phosphogypsum landfill, located in Sicily (Italy), is about 55 hectares wide with a maximum thickness of 10 m; a total volume of about 4.000.000 m3 of phosphogypsum has been dis-
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Radiation hazard indices in the application of phosphogypsum …
Phosphogypsum (PG), a by-product from the phosphoric acid industry, is being worldwide stockpiled, posing environmental problems. Viability of the PG safe re-use in civil construction has been ...
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Properties, Purification, and Applications of Phosphogypsum…
Phosphogypsum (PG) is a by-product produced during the wet process of phosphoric acid (H3PO4) production from natural phosphate rocks. Approximately 4–6 tons of PG is produced per ton of phosphoric acid production, where worldwide PG generation exceeds 300 million tons annually. The vast majority of produced PG is discarded irresponsibly, leading to …
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Radium equivalent activity (Ra eq ), external hazard index (H …
The internal hazard index, external hazard index, and radioactivity level index of the investigated fertiliser samples were found as 0.56 ± 0.034, 0.54 ± 0.08 and 0.69 ± 0.10, respectively.
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Gypsum Stacks: Formation, Composition, and Environmental …
These metals originate from the phosphate ore and pose potential environmental hazards, especially when exposed to water. The solubility of gypsum can facilitate the …
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Utilization of hemihydrate phosphogypsum for the …
Many studies have been done for the comprehensive utilization of PG. Original PG can be used as raw materials for preparation of Portland cement [5], cement retarder [6], soil stabilizer [7] and other building materials [8], [9].Due to the chemical components of original PG, it can also be used to prepare some chemical products such as calcium carbonate [10], …
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Consecutive pozzolanic layerings to depress internal-sulfate …
Given the excessive presence of phosphogypsum with an original deeper coloration [81] in the core PCBAs, it is hypothesized that these dark bands represent internal substances migration out and contaminating the matrix, accompanying the release of the internal curing water [55]. Nonetheless, these images present differences in the width of the ...
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E-DOCKET: EPA-HQ-OAR-2020-0442
The technical review concludes that for a road built using phosphogypsum in the manner described in the TFI risk assessment, the lifetime risks of fatal cancer to road users, …
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