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US EPA declines to order phosphogypsum toxicity tests
Phosphoric acid is made from mined phosphate, most of which in the US is found in mineral deposits in Florida. Phosphogypsum is created during the production of phosphate fertilizers from phosphoric acid. Reports of a leaking holding pond at a former phosphate plant in Florida in April elevated concerns about the ecological risks of such waste.
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Global Synthetic Gypsum Markets 2021-2027 - Focus on FGD Gypsum ...
The synthetic gypsum in the construction industry is used mostly to manufacture drywall, cement, and plaster of paris. Plaster of paris is used for making structures, sculptures, and decorative...
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Phosphogypsum: potential uses and problems - a review
Abstract Phosphogypsum (PG: CaSO4·2H2O) is a waste product generated by the phosphate industry. World production of this waste exceeds 200 million tonnes per year. PG, discharged into the sea, watercourses or in wilderness stocks, contains toxic elements harmful to ecosystems and human health, including heavy metals and radionuclides, and there is therefore a concern regarding environmental ...
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EQT Infrastructure to acquire Covanta in $5.3B deal - Construction ...
"To date, EPA has not received information or inquiries from any potential user indicating the desire to use phosphogypsum in road construction," said Enesta Jones, an EPA spokeswoman. The reversal was formally announced by EPA Administrator Michael Regan in a Federal Register notice published July 7. Regan sent it to the trade organization in ...
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Complex Processing of Phosphogypsum - a Way of Recycling Dumps with ...
Application in road construction In road construction, phosphogypsum is used for the production of hydraulic additives and material for the creation of a road foundation (Sizyakov et al. 2012). When the optimal amount (10-25%) of the
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A Review of Effective Utilization of Waste Phosphogypsum as a ... - IJER
construction industry. In India, about 6 MT of waste gypsum such as phosphogypsum, flurogypsum etc., are being generated annually there for it is necessary to set a secondary industries and recycling these waste into useful material. About twelve fertilizer plants in the country produce nearly 4 to 5 million tons
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EPA withdraws rule allowing use of radioactive material in road ...
The October 2020 rule allowed the use of phosphogypsum, a substance generated by phosphate fertilizer production. The waste product is kept in 13 predominantly southeastern states, where the...
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The Use of By-product Phosphogypsum for Road Bases and Subbases
Phosphogypsum from the Mobil Chemical Company's stockpile in Pasadena, Texas, is used in the study. Use of this locally available material would result in significant energy savings by reducing expensive transportation charges usually incorporated in the cost of conventional construction materials that are presently used in the Houston area.
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Promoting coordinative development of phosphogypsum resources reuse ...
Therefore, the rational disposal of phosphogypsum has become a pressing issue for the global phosphorus chemical industry. Recently, policy intervention has become a necessary measure to promote the development of phosphogypsum recycling in China, considering that solid waste disposal has become one of the most urgent environmental issues in ...
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Phosphate Fertilizer Plants - International Finance Corporation
Phosphogypsum may find a use in the pro-duction of gypsum board for the construction industry. Target Pollution Loads. Implementation of cleaner production processes and pollution prevention measures can yield both economic and environmental benefits. The fol-lowing production-related targets can be achieved by measures such as those described ...
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The study on the effect of flotation purification on the performance of ...
high value-added gelling material in the construction eld 30 . e preparation of α -hemihydrate gypsum by phosphogypsum has attracted the attention of scientists and technicians. Mi et al. used the "semi-liquid method" to prepare α-HH from phosphogypsum, and the product obtained by mixing 0.1% Maleic acid at pH = 7 had the
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Radiological Implications of Using Phosphogypsum as a ... - DeepDyve
Large quantities (approximately 69 million tons) of phosphogypsum are produced as a by-product of the fertiliser industry in Brazil. Although phosphogypsum is mainly calcium sulphate dihydrate, it contains a high level of impurities, including uranium and thorium decay products, which originate primarily from the source phosphate rock used in fertiliser production. The material is stockpiled ...
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Fertilizer Waste Crisis Needs Fixing: What the EPA, Congress Can Do
The report also found an increased hazard and contaminate release potential should the industry expand in the absence of hazardous waste regulation. ... The final ask in the petition relates to the Trump administration's approval of the use of phosphogypsum in road construction, which reverses a decades-old determination that phosphogypsum in ...
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Guidelines for Management, Handling, Utilisation and Disposal of ...
Phosphogypsum generated from phosphoric acid plants is presently stacked and some quantity is sold to the other industries for beneficial use especially as in cement manufacturing as raw material substitute for mineral gypsum, plaster board manufacturing as well as for alkali soil amendments or re-conditioning.
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Use of phosphogypsum in road construction - Semantic Scholar
Use of phosphogypsum in road construction The paper presents practical utilisation in the construction of a parking lot of compositions based on waste (phosphogypsum) from the wet process of orthophosphoric acid manufacture. The results of strength tests performed after half a year and after one and a half year of parking lot operation confirmed the feasibility, established earlier in ...
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A Simple and Efficient Method for Preparing High-Purity α-CaSO4·0.5H2O ...
We used CIT-3000F building materials radioactive detection analyzer to test phosphogypsum sample, according to the NATIONAL standard GB6656-2010. Differential thermal analysis and thermal-gravimetric analysis (TG-DTA) of products was analyzed using thermal analyzer method with SDTQ6000 analyzer using air atmosphere heating rate of 10 °C/min.
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Phosphogypsum as a construction material - ScienceDirect
Phosphogypsum (PG) is a by-product from the industry of phosphate fertilizer. • PG can be reused as a construction material. • Including PG in the matrix reduced its workability, density and mechanical strength. • Including PG in the matrix increased its shrinkage, expansion and water absorption. •
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Management of Phosphate Tailings - WISE Uranium
U.S. EPA approves - and withdraws - use of phosphogypsum for road construction The Environmental Protection Agency (EPA) is approving, subject to certain conditions, a request by The Fertilizer Institute for use of phosphogypsum in government road projects. ... Some waste management practices still found in the phosphate industry of today ...
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Potential use of phosphogypsum in paving blocks | Green Materials
Sep 13, 2021The phosphoric acid (P 2 O 5) industry is responsible for releasing huge amounts of phosphogypsum (PG). Phosphoric acid, widely used in fertilizer, pharmaceutical and detergent industries and for other uses, is obtained by a wet process of transforming natural phosphate ore using sulfuric acid at 70-80°C following the chemical reaction 1
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Phosphogypsum - An Industrial Byproduct with Value
Phosphogypsum has also been studied for use in construction and building materials. Use in such applications is always attractive for industrial by-products, as it provides an outlet for mass utilization, which is often a key requirement of waste reuse.
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Safety Directives | AERB - Atomic Energy Regulatory Board
The Mission of the AERB is to ensure the use of ionising radiation and nuclear energy in India does not cause undue risk to the health of ... Application in Industry. Radiation Processing Facilities; Industrial Radiography; ... AERB Directive No. 01/09- Use of Phosphogypsum in Building & Construction Materials & in Agriculture Safety Directive ...
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Construction of roads using phosphogypsum - sciencealpha
A description of the construction of roads using phosphogypsum: Building roads with phosphogypsum application allows you to build roads of higher quality, have longer life, significantly cheaper than traditional asphalt. Phosphogypsum is a byproduct waste that is formed during the production of mineral fertilizers.
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PHOSPHOGYPSUM: CHALLENGES & OPPORTUNITIES - Arab Fertilizer
IAEA emphasized by reviewed evidences that safe usage of phosphosgypsum represents a more sustainable solution and less environmental risky than the indefinite stacking operations of such a material. Some of the safe phosphogypsum usages, in addition to agricultural ones, could be in construction materials, for example tiles and others.
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Utilization of Phosphogypsum in Cement Concrete Pavement: A Review - IJSRD
resource for construction industry. This paper tries to focus on the use of phosphogypsum in partial replacement of cement in concrete. The use of above mentioned waste products with concrete in partial amounts replacing cement paved a role for 1) Modifying the properties of the concrete, 2) Controlling the concrete production cost,
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The Costs of Phosphogypsum - The Bradenton Times
Sunday, Oct 17, 2021. Phosphogypsum is the radioactive by-product of fertilizer production from phosphate rock. Phosphogypsum has no economic value because of its impure content. It is dumped at various locations throughout Florida in phosphogypsum (aka gyp) stacks. Piney Point in Manatee County is one example of a gyp stack.
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Coalition of environmental, health, and union activists mount ...
"The distribution of phosphogypsum will unnecessarily expose workers, the environment and the general public to otherwise avoidable radiation exposure. To allow the use of phosphogypsum as a construction material is the height of irresponsibility," said Glenn Compton, chairman of ManaSota-88. Republish
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Phosphogypsum-Based Concrete: Engineering Characteristics And ... - Miami
In this study the engineering characteristics of concrete mixtures containing dihydrate phosphogypsum, a by-product of the wet phosphoric acid industry, is investigated. Phosphogypsum-based concrete mixtures consolidated by impact compaction, external high-frequency vibration or static compaction are studied in unconfined compression, splitting tension and bending, and the results are ...
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Recent Development in Concrete By Replacing Phosphogypsum ... - IJISET
development of calcined products and hence it can be used in construction industry for preparation of concrete replacing some quantity of cement, which is a valuable ingredient of concrete, to achieve economy. Phosphogypsum in ordinary Portland cement mixes considerably retards setting time but does not contribute to produce unsound cement paste.
WhatsApp:+8617329420102Phosphogypsum Processing to Critical Raw Materials — ERA-LEARN
From a regional environmental point of view, PG maybe the single most critical processing issue of fertilizer production today. The objective of the project "Phosphogypsum Processing to Critical Raw Materials" (PG2CRM) is to further develop an innovative process for REE recovery from PG that has recently been patented by the coordinator ...
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Phosphogypsum Market | Global Industry Report, 2030
Consequently, phosphogypsum that exceeds this specific limit is stored in large stacks. However, The United States Environmental Protection Agency approved the use of phosphogypsum for road construction in 2020, mentioning that the approval has been granted at the request of The Fertilizer Institute, which advocates for the fertilizer industry.
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Advantages and Disadvantages of Using Phosphogypsum As Building ...
alternatives for the construction industry. One of these alternatives is to replace gypsum by phosphogypsum which would have the additional advantage of resolving partially the environmental problems created by fertilizer industries. Phosphogypsum can replace some of the natural components of building materials. However, it
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A Review of Effective Utilization of Waste Phosphogypsum as a Building ...
Material also provides a new resource for construction industry. ... phosphogypsum is in use from ancient period to till date and it Smadi, Haddad and Akour studied utilization of necessary to be continued because of its tremendous availability phosphogypsum as cement (OPC and PPC) replacement agents as waste product in order to reduce problem ...
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Imminent Failure Of Phosphogypsum Stack In Tampa Bay Exposes Phosphate ...
In December 2020 environmental, public health and union groups sued the EPA for approving the use of radioactive phosphogypsum in roads. The groups also petitioned the agency to reconsider its Oct. 20, 2020 approval of that use. "Dumping the phosphate industry's pollution into our aquifer and roads is not the solution," said Lopez.
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Phosphogypsum as a building and construction material in tropical ...
In way to contribute for the relative regulation of the handling and use of phosphogypsum as basic input, the determination of the concentration of natural radionuclides was made, as well as the determination of the exhalation rate of {sup 222}Rn in samples containing different proportions of materials used in the construction industry of Brazil.
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Phosphogypsum in the Circular Economy - AAPFCO
•Phosphogypsum (PG) can be used safely and it is not a waste. •PG is an affordable resource that has a value and a range of well-tested beneficial uses. •PG has been widely used directly ^as is in both agriculture and construction and is also recycled and/or reprocessed in significant quantities as an industrial resource for other applications.
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Durable Cost Effective Building Materials from Waste Fluorogypsum - NBM&CW
The waste of phosphoric acid industry popularly called as phosphogypsum is available to great extent. Fluorogypsum a waste of hydrofluoric acid manufacture has been studied for use in supersulphated cement or binding agents as reported by Taneja, et.al 2, Swanski 3.
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Applications of gypsum and phosphogypsum - osti.gov
The U.S. Department of Energy's Office of Scientific and Technical Information
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Radiological Risk Assessment in Support of Petition for Benefical Use ...
RADIOLOGICAL RISK ASSESSMENT IN SUPPORT OF PETITION FOR BENEFICAL USE OF PHOSPHOGYPSUM arcadis 351419 ES-1 EXECUTIVE SUMMARY Phosphogypsum is a by-product of the production of phosphoric acid for the fertilizer industry and contains naturally occurring radioactivity, the same radioactivity that is present in the phosphate ore from which
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Effect of Phosphogypsum on the Properties of Portland Cement - CyberLeninka
Treated phosphogypsum can be used as an ingredient of plaster[6, 7, 8]. The most important and motivating use of phosphogypsum could be in the construction industry. In the manufacturing process of cement, phosphogypsum could be used as a replacement of natural gypsum which plays the role of a set retarder[9, 10], or to reduce the
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Guest Op/Ed: Phosphogypsum and Radiation - The Bradenton Times
Allowing phosphogypsum to be used in roadbeds could open the regulatory door for the use of phosphogypsum in construction or agricultural applications. This will put the general public at an unacceptable risk, as the phosphogypsum will become widespread in its distribution. ... The phosphate industry should not be permitted to externalize the ...
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