The commonly used production process, which dates to the 1840s, is not very efficient.For every ton of phosphoric acid produced, more than 5 tons of phosphogypsum waste is generated.. Florida has ...
The solid portion is known as phosphogypsum. • 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. ... radioactivity in the stacked phosphogypsum is actually less than what was in the original …
Phosphogypsum (PG) is a by-product produced during the wet process of phosphoric acid (H3PO4) production from natural phosphate rocks. Approximately 4–6 …
DOI: 10.1016/j.conbuildmat.2023.134262 Corpus ID: 265548719; Recycling of phosphogypsum and clay by-products from phosphate mines for sustainable alkali-activated construction materials
1. Introduction. Phosphogypsum (PG) is a waste obtained through the chemical reaction of sulfuric acid with phosphate rock during the production of phosphoric acid [1].PG is composed mainly of gypsum (CaSO 4 ⋅2 H 2 O), but contains also small amounts of impurities such as phosphorus pentoxide, organic matter, heavy metals, and …
Phosphogypsum (PG) waste is a by-product generated from wet-process phosphoric acid (H3PO4) 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 unused PG is usually …
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 ...
1. Introduction. Phosphogypsum (PG) is a by-product of phosphate fertilizer industry worldwide (Chernysh et al., 2021).It was estimated that five tons of PG would be produced for the production of one ton of phosphoric acid (Papastefanou et al., 2006).The storage of PG in China has exceeded 400 million tons, and global storage …
During the process of phosphoric acid production, the potentially hazardous waste by-product phosphogypsum, hydrated calcium sulfate, is produced at a quantity …
2. Morocco Mine production: 35 million metric tons. As the second largest phosphate-producing country, Morocco produced 35 million metric tons of the fertilizer in 2023, down from 39 million MT in ...
Phosphogypsum Stacks. ... There is also an abundance of flue gas desulfurization gypsum produced as a by-product of coal-fired power plants. As a result, the market for the phosphogypsum generated by the chemical processing of phosphate rock has traditionally been limited. It has traditionally been piled on land. This was the least …
This study contributes to sustainable construction practices by exploring the use of phosphogypsum, a commonly discarded byproduct, in the production of recycled aggregates. Addressing both environmental and economic aspects of sustainability, we investigate the feasibility of employing phosphogypsum as a primary raw material, in …
The phosphate impurities in phosphogypsum (PG) were removed efficiently by a novel two-step crystal transformation approach, and the mechanism of the two-step transformation method for removing phosphate and metal impurities from PG was described. The effects of modified PG, natural gypsum, and PG as Portland cement …
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%, …
Side view of phosphogypsum stack. Phosphate production generates huge amounts of phosphogypsum wastes, nearly 48 million MTs in 1988 alone. Industry estimates that 5.2 tons of phosphogypsum is produced for every ton of phosphoric acid. Phosphogypsum has little market value and is transferred as a slurry to waste piles …
Phosphogypsum (PG), the main industrial by-product of phosphate fertilizer industry, primarily consists of calcium sulfate dihydrate. However, it contains various impurities with variable quantities depending on the origin of the phosphate rock. These impurities can restrict the reuse of phosphogypsum as a secondary primary …
Phosphate rock contains the mineral phosphorus, an ingredient used in some fertilizers to help plants grow strong roots. …
The phosphogypsum and rock phosphate samples were analysed for the estimation of radioactivity in them along with the soil samples. The results for activity concentration of 238 U, 226 Ra, 232 Th and 40 K in the samples were compared with other studies carried out worldwide. Table 2 shows the wide variation of activity concentrations …
Deep removal of phosphate impurities in phosphogypsum by two-step crystal transformation for use as Portland cement retarder. Author links open overlay panel Shaokun ... Efficient precipitation of soluble phosphorus impurities in the recycling of phosphogypsum to produce hemihydrate gypsum. J. Clean. Prod., 396 (2023), Article …
Phosphogypsum (PG: CaSO 4 ·2H 2 O) is a waste product generated by the phosphate industry. World production of this waste …
A by-product of the reaction is calcium sulfate dihydrate (CaSO 4 ·2H 2 O), which is called phosphogypsum. Other products are phosphoric acid and hydrogen fluoride. Phosphogypsum is also composed, in lesser concentrations, of toxic elements (impurities, heavy metals and radioactive elements).
Phosphogypsum (PG) is a hazardous industrial solid waste product from the wet phosphate industry 1,2. The widespread deposition of that fine, light- to dark-grey, powder with a slight odor and ...
Bills have been introduced in the state legislature that would allow the use of a radioactive byproduct of phosphate mining in road beds. Its use is currently prohibited across the country. The bill in the Florida House was introduced by Republican Lawrence McClure of Plant City. It would allow demonstration projects using phosphogypsum in …
Imminent Failure of Phosphogypsum Stack in Tampa Bay Exposes Phosphate Industry Risks Catastrophic Wastewater Release Highlights Need for Federal Action. 1 (Center for Biological Diversity ...
The use of composts promotes plant growth and physiology as a promising sustainable strategy. The main objective of this study is to evaluate the impact of phosphate flotation waste (PFW) and phosphogypsum (PPG) composts on the growth and physiology of tomato plants under two water regimes (40% field capacity (FC) and …
The concentrations of 238U, 226Ra, 232Th and 40K maintained in phosphate rock (PR), phosphoric acid (PA) and phosphogypsum (PG) samples and its possible radiation hazards, have been measured. The radionuclides in phosphate rock have been redistributed unsymmetrically between phosphoric acid and …
Phosphogypsum, a by-product of phosphate fertilizer production, is produced in large quantities worldwide. ... Radioactivity and Elemental Composition of Phosphogypsum Produced From Three Phosphate Rock Sources. P.M. Rutherford, M.J. Dudas, and J.M. Arocena View all authors and affiliations. Volume 13, Issue 5.
Phosphogypsum (PG) is a calcium sulphate dihydrate and a by-product of the phosphate fertilizer industry. It is produced in huge quantities (300 MT/year), but only 15% of the PG produced is recycled.
Phosphogypsum (PG: CaSO4·2H2O) is a waste product generated by the phosphate industry. World production of this waste exceeds 200 million tonnes per year.
Phosphogypsum (PG) is a by-product of phosphate fertilizer production that contains radioactive and hazardous elements. This review evaluates the geochemical …
While most of the rest of the world looked at phosphogypsum as a valuable raw material and developed processes to utilize it in chemical manufacture and building …
Phosphogypsum is a by-product of phosphate fertilizer production and a source of calcium, sulphur, and phosphorus for plants. It can be used as a fertilizer or …
Phosphogypsum is the principal by-product produced by the wet processes involved in the manufacture of phosphoric acid, and generally contains an amount of fluoride that needs to be fixed or removed.
Nearly 300 million t of phosphogypsum (PG) are produced every year as a byproduct from phosphate fertilizer production worldwide. Approximately 58% of the PG are stacked, 28% are discharged in coastal waters and only 14% are further processed. ... The s-PGs usually have higher SiO 2 contents than the m-PGs with the exception of the …
Treatment of phosphogypsum waste produced from phosphate ore processing J Hazard Mater. 2013 Jan 15;244-245:596-602. doi: 10.1016/j.jhazmat.2012.10.053. Epub 2012 Nov 2. Authors H El-Didamony 1, H S Gado, N S Awwad, M M Fawzy, M F Attallah. Affiliation 1 Chemistry Department ...
The Environmental Protection Agency's limits on using phosphogypsum date to 1989. Phosphate mining, a leading industry in Central Florida, involves pulling up rocks that hold uranium and radium ...
PG is produced in WPA production with sulfuric acid. The mass of the PG produced during phosphoric acid production exceeds that of the product, i.e. 4.5–5.5 tonnes of PG are produced for every tonne of P 2 O 5 produced (El-Didamony et al., 2012). Phosphogypsum is usually a yellowish-white, light greyish-white or dark grey …
In this work, the united treatment of calcium hydroxide precipitation and La-ZFA adsorption is developed to treat the phosphogypsum leachate as shown in Fig. 1, as well as achieve the continuous recovery of phosphate and fluoride.The composition of phosphogypsum, and the factors affecting the leaching behavior of phosphate, …
Phosphate rock (PR) and phosphogypsum (PG) contain heavy metals, radionuclides and are exposed to ultraviolet and cycles of desiccation (i.e., Gafsa and Sfax in Tunisia). Nevertheless, an extensive diversity of bacterial species has been identified in such extreme and nutrient-poor environments. This mini-review aims to summarize …
Phosphogypsum is a by-product of the phosphate fertilizer industry. Its main constituent is calcium sulfate dihydrate. ... According to recent statistics, the phosphate industry in Central Florida annually produces 33 million tons of phosphogypsum and has over 500 million tons stockpiled. It is estimated that by the year 2000, Florida could ...