For a detailed characterization of the 5.7 10 6 mt phosphogypsum (PG) stack in the vicinity of Bacau city, Romania, the air dose rate (ADR) was measured in 72 points covering the stack surface, while 10 samples of stack material were collected for future analysis. Radiometric determinations showed for the ADR values varying between 364 ± 53 and …
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The production of one metric ton of phosphoric acid generates five of phosphogypsum (Papastefanou et al. 2006).Contrary to natural gypsum, phosphogypsum contains various impurities, including acidity remnants, fluorinated substances, trace elements such as arsenic, zinc, cadmium, chromium, lead, and …
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Extraction of rare earth elements from digested phosphogypsum solutions with a number of well-known organophosphorus compounds, tributyl phosphate, ctylphosphine oxide, and bis(2-ethylhexyl ...
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The presence of trace elements in phosphogypsum affects the subsoil as several authors have pointed out in their studies (Calin et al., 2015; El Zrelli et al., 2019; Jalali et al., 2019; Huang et al., 2020) Calculating the value of the effective ambient dose equivalent H*(10) it is mandatory to subtract the value of the radioactive background ...
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Phosphate rock is naturally radioactive and contains uranium series radionuclides Phosphogypsum (PG) is a by-product of the production of phosphoric acid for phosphate fertilizer industry PG is also naturally radioactive and contains uranium and uranium decay products, notably radium (Ra-226) Current PG management in US is land disposal in …
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Phosphogypsum (PG) is a solid by-product of the phosphate industry, rich in contaminants and produced in large quantities. Raw materials and stabilized specimens, consisting of bentonite-lime-PG mixtures, were characterized by mineralogical, microstructural, chemical, alpha-particle, and gamma-ray spectrometry analysis before …
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Made available by U.S. Department of Energy Office of Scientific and Technical Information ...
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The production of one metric ton of phosphoric acid generates five of phosphogypsum (Papastefanou et al. 2006).Contrary to natural gypsum, …
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Phosphogypsum is a solid waste byproduct from processing phosphate ore to make phosphoric acid that is later used in fertilizer. Phosphogypsum contains radium, …
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After leaching process for phosphogypsum by water deionized and obtain on a solution that contains heavy and radioactive elements (Cu, Zn, Pb, Cd, U, Ni, K, and Th), were subjected to treatment by ...
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The concentration of naturally occurring radionuclides in soil, rock phosphate and phosphogypsum samples collected around a phosphate fertilizer plant were …
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Phosphogypsum, a waste product from manufacturing fertilizer, emits radon, a radioactive gas. It also contains the radioactive elements uranium, thorium and radium. Phosphate rock mining is the …
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10 - Recycling of radioactive phosphogypsum wastes. Author links open overlay panel Yelizaveta Chernysh. Show more. Outline. Add to Mendeley. Share. ... Leaching of rare earth elements (REEs) and impurities from phosphogypsum: A preliminary insight for further recovery of critical raw materials. Journal of Cleaner …
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Partitioning of radionuclides and trace elements in phosphogypsum and its source materials based on sequential extraction methods ... Leachability of heavy and radioactive elements in deionized water that has been inspected under various states of leaching, including solid/liquid ratio (10, 20 and 50 /1g/L) and temperatures (25, 45 and 85 °C ...
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The degradation of organic matter (OM) and CH 4 emissions during composting greatly influence the composting efficiency and greenhouse effect. This study evaluated the effects of adding phosphogypsum (PPG) and medical stone (MS) on OM breakdown, CH 4 emissions, and their underlying mechanisms. MS accelerated the …
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XA0201236 Leaching assessment of radioactive and non-radioactive elements from Brazilian phosphogypsum N.C. Silva8'b' E.A. De Nadai Fernandes", M. Cipriani3, M.H.T.Taddeia a Comissao Nacional de Energia Nuclear, Laboratorio de P090S de Caldas, CNEN/COLAB, P090S de Caldas, Brazil bCentro de Energia Nuclear na Agricultura, …
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OMAN PAKISTAN PALAU PANAMA PARAGUAY PERU PHILIPPINES POLAND PORTUGAL QATAR REPUBLIC OF MOLDOVA ROMANIA ... phosphogypsum …
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LONDON, UK – May 21, 2018 – Element Materials Technology (Element) has opened a new laboratory in Duqm, Oman to offer improved access to expert testing services for customers in the region. The new laboratory will complement the existing facilities in Muscat and Sohar and is ideally located for the petrochemical complex and infrastructure ...
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Phosphogypsum(PG) is one of the typical bulk industrial solid wastes generated in the phosphate chemical industry. Due to its huge production volume and immature resource treatment technology, a large amount of PG can only be stored and disposed in slag yards, and its impact on the ecological environment is becoming increasingly significant during …
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For the Russian Federation, an urgent issue is the search for new raw materials sources of rare earth elements (REE) [1, 2].Phosphogypsum, a large-tonnage product of apatite processing in the production of extraction phosphoric acid for mineral fertilizers, can serve as one of the promising sources of REE [3–7].In addition to rare …
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BFSZU Easa et al. Vol.39-Dec.2017 1 BIOSORPTION OF RADIOACTIVE ELEMENTS FROM PHOSPHOGYPSUM BY SACCHAROMYCES CEREVISIAE Saadia M. Easa1, Mohsen M. Ali2, Nora S. Gad2, Mahmoud.M. El-Maadawy2, and Dina M. Elgohary 1* 1Microbiology Department, Faculty of Science, Ain Shams University 2Nuclear Materials …
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Phosphogypsum, leaching, heavy elements, radioactive elements. The essential purpose of this paper is to illustrate and inspect the leaching characteristics of Iraqi Phosphogypsum (PG). The paper presents the results of the dissolution characteristics of heavy and radioactive elements from PG, which is a by-product result from the industry …
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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 ...
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A cluster visualization of the uses of phosphogypsum with a focus on the binding of radioactive elements in it is considered. The main disadvantages of the existing methods of phosphogypsum recycling were identified and trends in this waste management were also considered. ... The leaching characteristics of common toxic …
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A study on the concentrations of radioactive elements in phosphate ores of the main phosphate mining areas in Guizhou showed that their U- 238 and Ra-226 concentrations were circa three and two times higher (132.4 ± 15.9 Bq/kg·dry and 148.2 …
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Figure 4: Effect of Solid to Liquid ratio on removed heavy and radioactive elements from Phosphogypsum by deionized water B. Effect of temperature For each phosphogypsum sample, the temperature was found to play a vital role in determining the removal efficiency of heavy and radioactive elements. A temperature range from 25 to 85 °C was ...
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(Dalia et al. 2018). Moreover, phosphogypsum is classified as Naturally Occurring Radioactivity (NORM), containing radioactive elements from the 238U, 226Ra, 232Th …
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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. The world production of phosphogypsum exceeds 200 million tons per year. PG discharged into water bodies (seas, rivers) or …
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The issue has drawn attention, at least in part, because phosphogypsum includes radioactive elements. It is stored in huge stacks. Opposition to phosphogypsum in roads. Opponents raised …
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In a letter addressed to the BOC, Director Metodio U. Turbella of the Environmental Management Bureau said that neutralized phosphogypsum is radioactive due to the presence of naturally occurring radioactive elements. "The importation of recyclable materials such as scrap metals, should not contain radioactive materials.
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