Radium removal from phosphogypsum
WebNov 18, 2024 · When processing phosphate rock to make fertilizer, the phosphorous is removed by dissolving the rock in an acidic solution. The … WebRadium-226 in phosphogypsum produced in a phosphate industry, SICNG operating at Thessaloniki, Northern Greece since May 1966, varied from 261 to 688 Bq kg (-1) (mean value 508 Bq kg (-1)). This radionuclide in soil tilled with phosphogypsum used for agricultural purposes varied from 50 to 479 Bq kg (-1) (average 205 Bq kg (-1)), while in …
Radium removal from phosphogypsum
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WebFeb 2, 2024 · In the chemical treatment carried out by different leaching techniques pointed out that 40% of Ra-226 in PG is removed by a single chemical leaching. About 87% of Ra … WebJan 15, 2013 · The removal process is based on leaching of radionuclides using suitable organic extractants. The factors affect the leaching process such as type of leaching …
WebFeb 24, 2024 · Assuming typical partition coefficients for uranium and radium between phosphoric acid and phosphogypsum known from the literature (2.33 and 0.11 corresponding to 70% retention of 238 U in phosphoric acid and 90% of 226 Ra in PG, lead behavior is very similar to Ra) and taking into account measured 238 U, 226 Ra, and 210 … WebSep 1, 1995 · Moisset (1990) Radium Removal from Phosphogypsum. In Proceedings of the Third International Symposium on Phosphogypsum. Miami, Florida, U.S.A.: Florida Institute of Phosphate Research Publication No. 01-060-083, 1, pp. 383-397. Google Scholar
WebThe U.S. EPA prohibits the use of phosphogypsum because of the radioactivity. An exception is made for phosphogypsum with an average concentration of less than 10 pCi/g radium which can be used as an agricultural amendment, but for no other use. Phosphogypsum in north Florida has 10 pCi/g radium. WebOct 20, 2024 · Phosphogypsum is a solid waste byproduct that results from processing phosphate ore to make phosphoric acid that is later used in fertilizer. Because the phosphate ore contains uranium and radium, phosphogypsum also contains these radionuclides. The radium is of particular concern because it decays to form radon, a …
WebJul 8, 2024 · 227 Ac was separated and purified from phosphogypsum using anionic and cationic exchangers. 227 Ac and its daughters can be easily determined using γ spectrometry and LSC. The proposed method of separation and purification can also be used for determining 227 Ac, 227 Th and 223 Ra activity concentrations in environmental …
WebFeb 1, 2024 · Phosphate rocks can contain considerable amounts of accompanying uranium and rare earth elements (REEs). Interest to extract these elements during phosphate rock processing to mineral fertilizer is given as both uranium and REEs are valuable and toxic. arabzadeh rugWebOct 1, 2024 · This study determined that the process of reduction of radionuclides in phosphogypsum is capable of reducing the level by approximately 94% of the volume of … araca bedachungen dinslakenWebJun 1, 2024 · Waste gypsums such as phosphogypsum or gypsum from the mine water desalination plant were used for this purpose, the radium concentration in these types of gypsum was between 500-800 Bq/kg in case of phosphogypsum and below 300 Bq/kg for gypsum from the desalination plant [27]. The process was carried out in underground … baja 1000 dates 2022WebPhosphogypsum may require pre-processing to remove contaminants before use. Phosphorus (P) significantly retards curing and reduces the strength of the material, an … araçai araçatuba whatsappWebApr 3, 2024 · The pond at the old Piney Point phosphate mine sits in a stack of phosphogypsum, a waste product from manufacturing fertilizer that is radioactive. It contains small amounts of naturally... arab zwembadWebIn general, about 10-50% of the radium in Florida phosphogypsum is water soluble, although there are some data which suggest that the radium is actually associated with extremely fine-grain particles, perhaps colloids. ... We assessed the potential of a bacterial isolate to remove and incorporate dissolved polonium from solution by conducting ... arabzadeh leilaWebRadium removal from phosphogypsum. J. Moisset, D. P. Borris, P. Boody Published 1980 Engineering No Paper Link Available Save to Library Create Alert Cite 5 Citations Citation … baja 1000 2022 dates