acid, 4–5 tons of phosphogypsum are produced (El Issiouy et al. 2013; Papastefanou et al. 2006). Currently, between 3 and 4 billion tons of phosphogypsum have been produced, with an annual rise of 300 million tons (Cuadri et al. 2021). The question of considering phosphogypsum as a waste or a resource has been
Phosphogypsum (PG) waste is a by-product generated from wet-process phosphoric acid (H 3 PO 4) manufacturing during phosphate rock decomposition.Worldwide, the annual production of PG ranges between 100 and 300 million tons, with only a few quantities utilized in several application domains (about 15%), the …
Background: Alkaline soils with high calcium carbonate and low organic matter are deficient in plant nutrient availability. Use of organic and bio-fertilizers has been suggested to improve their properties. Therefore, a greenhouse experiment was conducted to evaluate the integrative role of phosphogypsum (PG; added at 0.0, 10, 30, and 50 g PG kg-1), …
Florida lawmakers want to use radioactive material phosphogypsum to pave roads Phosphogypsum, a byproduct in the fertilizer industry, contains uranium and radium — and as the EPA notes, it also ...
In 1989, stacking of phosphogypsum became a legal necessity when the U.S. Environmental Protection Agency (EPA) banned the use of phosphogypsum. In 1992, this rule was modified to allow the use of …
WASHINGTON (October 14, 2020) — Today, U.S. Environmental Protection Agency (EPA) Administrator Andrew Wheeler approved a request from The Fertilizer Institute (TFI) to allow phosphogypsum to be used in government road construction projects. "Allowing the reuse of phosphogypsum shows EPA's commitment to working with industry in a way that …
Phosphogypsum (PG) is a by-product of phosphorus fertilizer that is typically stacked near production sites. Phosphogypsum contains trace elements and naturally occurring radioactive materials which may be hazardous to the surrounding environment. Phosphogypsum stack reclamation typically involves placing a soil cap …
Abstract. Phosphogypsum (PG), a solid by-product of phosphoric acid production, contains radionuclides and trace metals in concentrations which may pose a potential hazard to human health and the environment. to investigate the possibility of bioaccumulation of radium and six heavy metals over time when aquatic organisms …
Phosphogypsum (PG) is a solid waste produced from decomposition of phosphate rock in sulfuric acid. It can improve the physicochemical properties of soil. However, the application of PG will ...
Phosphogypsum (PG) is a by-product of the phosphate fertilizer industry that is produced during the phosphoric acid production process. Annual global PG production ranges between 100 to 300 Mt, with only 15% of that utilized while the rest is usually placed on large dumps with potential serious human and environmental impacts.
The preparation of LWC-PG follows the proportioning method of LWC-PG described in Dong's research [41].According to this method, the particles in the phosphogypsum-based concrete are densely packed [61].To meet the performance requirements of phosphogypsum-based concrete, high-efficiency water reducer …
On June 30, 2021, the EPA withdrew previously granted conditional approval to use phosphogypsum in government road construction projects. On October 14, 2020, the EPA approved The Fertilizer Institute's request to use phosphogypsum in government road construction projects subject to certain terms and conditions.
Using phosphogypsum-based excess-sulfate cement (PESC) for the preparation of super retarding materials. • PESC can achieve initial setting for 86 hours and final setting for 134 hours without additional retarders, and its 28d-compressive strength is 24.9 MPa. • The retardation mechanisms of phosphogypsum in PESC has been …
According to a 2019 report from the Fertilizer Institute, an estimated 734 million tons of phosphogypsum have accumulated in the United States — a number the industry group projected to steadily …
• Phosphogypsum produced in North Florida contains roughly 5 – 10 picocuries per gram (pCi/g) of radium while phosphogypsum from Central Florida contains about 20 – 35 pCi/g radium. • The U.S. EPA prohibits the use of phosphogypsum. An exception is made for phosphogypsum with an average concentration less than 10 pCi/g radium which can ...
2.1 Phosphogypsum Generation Processes. The wet and dry process are the two main commercial processes used to produce phosphoric acid from natural phosphate. The dry process consists of a thermal reduction of rock phosphate at 2000 °C using an electrical furnace in the presence of coke or silica.
Phosphogypsum disposal was a very simple matter in the early days of the industry. If at all possible, you located your plant near the ocean or on a river and dumped the phosphogypsum into the sea or the river. If you were foolish enough to locate where water disposal was not possible, you suffered the economic penalty of having to stack the ...
Phosphogypsum is a high volume solid waste by-product generated when sulfuric acid reacts with the phosphate rock during manufacturing of phosphoric acid, which is a major constituent for many fertilizers. ... Tunisia, South Africa, and Mexico discharge the waste phosphogypsum into the sea (Ardaman and Associates). It is reported that …
This report is addressing rapidly changing scientific, regulatory and policy perspectives concerning phosphogypsum (PG) management and use worldwide. It has been authored and reviewed by many of the world's top experts on PG from academia, international agencies and representatives of IFA's own member companies. The report …
Environmental impact and management of phosphogypsum. Hanan Tayibi, ... Aurora López-Delgado, in Journal of Environmental Management, 2009. Phosphogypsum (PG) is a waste by-product from the processing of phosphate rock by the "wet acid method" of fertiliser production, which currently accounts for over 90% of phosphoric acid …
The test samples used in this study were taken from phosphogypsum produced by a phosphorus chemical enterprise in the Deyang Region, Sichuan Province, China. The content of CaSO 4 ·2H 2 O in the phosphogypsum was 80.65%, and the whiteness was 27.68. The water content of the phosphogypsum was less than 5%, …
Phosphogypsum (PG) is a by-product produced during the wet process of phosphoric acid (H 3 PO 4) production from natural phosphate rocks. Approximately 4–6 …
Phosphogypsum (PG) is a by-product of the phosphate fertilizer industry that is produced during the phosphoric acid production process. Annual global PG production ranges …
Phosphogypsum (PG), a solid by-product of phosphoric acid production in the fertilizer industry, contains radionuclides and trace metals in concentrations which are potentially hazardous to human ...
Previous studies have utilized the PHREEQC model to understand the behavior of radionuclides in coastal Brazil 11,12, geochemistry in Mexico 13, and …
1 Agricultural Innovation and Technology Transfer Center (AITTC), Mohammed VI Polytechnic University, Benguerir, Morocco; 2 OCP Group, OCP Sustainability Platform, Casablanca, Morocco; Salinity and sodicity are the most agricultural challenges in arid and semi-arid regions. A pot experiment was undertaken, to evaluate …
Florida Gov. Ron DeSantis has approved a plan to use phosphogypsum, a radioactive waste material, in "demonstration projects." Here, signs block a roadway in Boca Raton during a construction ...
As a typical solid waste, phosphogypsum (PG) is the by-product generated during the exploitation of phosphate resources 1,2,3. Global production of PG is estimated to be around 100–280 Mt ...
Studies on the biotransformation of phosphogypsum (a waste product formed in the course of the production of phosphorous fertilizers) with the use of sulfate reducing bacteria (SRB) demonstrated that it is a good source of sulfates and biogenic elements for these bacteria, though the addition of organic carbon and nitrogen is necessary.
The key technology of wet process phosphoric acid recrystallization is phosphogypsum phase transformation. In this study, the hydration of α-hemihydrate phosphogypsum (α-HH) to dihydrate phosphogypsum (DH) and the influence of process parameters on hydration kinetics are performed by modifying a dispersive kinetic model …
Phosphogypsum stacks originating from the processing of phosphate rock contain small amounts of radionuclides, such as 226Ra. ... geochemistry in Mexico 13, and radionuclide transport in Germany 14.
Phosphogypsum could be used as a substitute of natural gypsum in the production of Portland cement to control the hydration reaction rate of cement. In this study, raw phosphogypsum was...
Phosphogypsum (PG: CaSO 4 ·2H 2 O) is a waste product generated by the phosphate industry. World production of this waste …
Phosphogypsum is a by-product of phosphoric acid industrial production, and its stacking volume is increasing year by year, which brings a great threat to the environment and agricultural safety. The way of comprehensive utilization of phosphogypsum was described, and the mechanism of phosphogypsum producing …
Florida Gov. Ron DeSantis recently signed a bill that will allow the Florida Department of Transportation to study the use of phosphogypsum in road construction. This came after a longstanding federal-level prohibition on using phosphogypsum, which was repealed by then-President Donald Trump's Environmental Protection Agency (EPA) in October …
Phosphogypsum (PG) is a solid waste product generated during wet-process phosphoric acid production. Various impurities considerably reduce the purity, whiteness, and application range of PG. This ...
The phosphogypsum valorization became a necessity when the U.S. Environmental Protection Agency (EPA) legislation was modified in 1992 and allowed the use of PG with an average 226 Ra of less than 370 Bq/kg for agricultural applications such as a soil amendment. Other areas in the world, however, looked at PG as a valuable raw …
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 ...
