"Any request for a specific use of phosphogypsum in roads will need to be submitted to EPA, as EPA's approval is legally required before the material can be used in road construction," the agency ...
Bills in the House and Senate that would authorize the Florida Department of Transportation to undertake demonstration projects and studies evaluating the use of phosphogypsum in road construction ...
Bills in the House and Senate that would authorize the Florida Department of Transportation to undertake demonstration projects and studies evaluating the use of phosphogypsum in road construction ...
During the process of preparing PG for use as a building and/or decoration material, phosphogypsum changed from a hydration level of ½ and 2 (PGF and PGW, respectively) to …
Florida House Bill 1191; Environmental Protection Agency ... the DOT has to conduct "demonstration projects using phosphogypsum in road construction aggregate material" as it studies the usefulness of the material as a paving material. The DOT has until April 1, 2024 to provide its findings on the suitability of using the material for roads ...
(It was also used in concrete and cement before the state of Idaho banned its use in habitable construction in 1977.) Today, more than 70 stacks of phosphogypsum exist across the country. The ...
Using cast-in-situ phosphogypsum as a wall material for buildings can consume a large amount of pollutants and improve the efficiency of building construction. The strength of …
Phosphogypsum (PG) is a byproduct of the wet phosphoric acid process, with calcium sulfate as its primary component. Approximately 4.5–5.0 t of PG are generated per ton of phosphoric acid produced (Li & Gu, 2016).Globally, the cumulative stockpiles of PG have reached 6 billion t, with an annual increase of 200 million t (Ou et al., 2021).By the end of 2020, PG …
Phosphogypsum can replace some of the natural components of building materials. However, it contains a higher radioactivity concentration than the natural products (Table 1) and its use in …
The work by Zemni et al. [44] provides a study on the generation of calcium silicate and sodium sulphate, through the chemical reactions between phosphogypsum and sodium silicate.The results showed that the solid produced during the reaction can sequester CO 2.Rashad [17] assessed the effect of PG on properties such as workability, density, mechanical …
Phosphogypsum is usually a yellowish-white, light greyish-white or dark grey fine powdery solid. The main component of PG is CaSO 4 ·2H 2 O, which accounts for more than 90% of its total composition. In addition, PG contains phosphorus, fluorine, organic matters and other impurities (e.g. heavy metal elements and nuclides) (Rashad, 2015).These substances …
Location of the phosphogypsum disposal site in relation to the fertiliser factory and the city of Kutina, Croatia. The disposal site consists of five ponds and has a surface of 1.7 km 2 and average depth of 4 m. The embankment dams (clay) surrounding the disposal site are constructed in such a way as to protect the surrounding environment.
The incorporation of construction and demolition waste in concrete and cement mortars is already a common practice, and the aim is to ensure the construction industry assumes part of the waste it produces [11,12]. The goal of this stream is to promote the use of conglomerates by incorporating waste to produce so-called "green concrete".
Phosphogypsum is valued in several sectors: road construction, building materials and agriculture. In agriculture, PG is used as an amendment for degraded soils (saline, sodic and acid soils) and as a fertilizer because it contains many essential nutrients for plant growth and development such as calcium, sulphur, and phosphorus.
The EPA in 2020 approved the use of phosphogypsum in government road construction projects but reversed its decision after Democratic President Joe Biden took office. Environmental groups have warned about phosphogypsum spilling into waterways and elsewhere during storms. A leak in March 2021 at a stack called Piney Point resulted in the ...
The use of materials containing naturally occurring radionuclides for house construction may enhance the natural radiation background to which some population groups are exposed.
Phosphogypsum stack in West-Central Florida. By Seán Kinane/WMNF News (2010). The House on Wednesday passed a bill that would clear the way for demonstration projects about using phosphogypsum, a byproduct of the phosphate industry, in building roads.. House members voted 81-25 to approve the bill (HB 1191), sponsored by Rep. Lawrence …
Building elements made of phosphogypsum, such as wallboards and similar construction elements, give yield to high values of radon emanation together with the mentioned elevated concentrations of 226 Ra. Phosphogypsum can be used in Portland cement as a setting time retarder in amounts below 4–5 wt%; then, it is diluted in the concrete and ...
Phosphogypsum is used in agriculture for soil amendment or as fertilizer, as well as in the brick and cement industry, and in road construction Discover the world's research 25+ million members
In this study, building phosphogypsum was used as the base material, and fly ash, lime, cement, and other materials were added to explore the performance of phosphogypsum-based cementitious ...
What is known currently about HB 1191, which passed by a wide vote in the Republican controlled body, would require the Florida Transportation Department to research phosphogypsum paving projects ...
An experimental house has been constructed, in which walls and ceilings have been built of gypsum and phosphogypsum. Since phosphogypsum potentially contain radioactive elements, the application of an activity concentration index to the phosphogypsum employed in the building was carried out.
Phosphogypsum utilization has evolved along three broad use groupings: (1) Chemical raw material (2) Agricultural applications (3) Construction materials. Each of these uses will be considered in more detail, but it should be pointed out that for years Florida has not been in the forefront of the efforts to utilize phosphogypsum.
Not only natural gypsum (NG), but also phosphogypsum (PG), which is a by-product of the synthesis of orthophosphoric acid from phosphorite rock, can be used as a …
The stockpiling of phosphogypsum is a waste of land resources and also causes serious pollution to natural resources such as water and atmosphere. This paper explores the mechanism of efficiently modified phosphogypsum and constructs a model and evaluation system for heavy metal leaching and migration transformation. The modified phosphogypsum is used …
About 15% of the phosphogypsum produced is used directly, mostly in fertilizers, soil stabilization measures, and raw materials for the construction industry [2, 4]. As a result, …
An experimental house has been constructed, in which walls and ceilings have been built of gypsum and phosphogypsum. Since phosphogypsum potentially contain …
The Fertilizer Institute, however, argues that the use of phosphogypsum in road construction is safe and is used in other parts of the world. In response to the EPA withdrawing its approval of the ...