Radium removal in a large scale evaporitic system

Rosenberg, Yoav O.; Metz, Volker; Ganor, Jiwchar

doi:10.1016/j.gca.2012.10.046

Cited by 21 publications

(23 citation statements)

References 37 publications

(82 reference statements)

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“…For example, Al Attar et al [114] report barite-strontianite solid solution and hokutolite [(Ba,Pb)SO4] as the main mineral components of radionuclide-containing scales associated with oil production. Extensive solid solution between isostructural Ba-and Ra-sulphates (so called radiobarite, (Ba,Ra)SO4 [165][166][167][168][169][170][171][172][173][174] has been modelled, and a number of natural occurrences have been documented e.g., [175,176]. In a detailed mineralogical insight into radionuclide host phases, Landa and Bush [79] document intense alpha particle activity associated with the presence of 210 Pb within micron-scale inclusions of anglesite within laths of gypsum.…”

Section: Sulphates Carbonates and Other Potential Hostsmentioning

confidence: 99%

210Pb and 210Po in Geological and Related Anthropogenic Materials: Implications for Their Mineralogical Distribution in Base Metal Ores

et al. 2018

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Abstract:The distributions of 210 Pb and 210 Po, short half-life products of 238 U decay, in geological and related anthropogenic materials are reviewed, with emphasis on their geochemical behaviours and likely mineral hosts. Concentrations of natural 210 Pb and 210 Po in igneous and related hydrothermal environments are governed by release from crustal reservoirs. 210 Po may undergo volatilisation, inducing disequilibrium in magmatic systems. In sedimentary environments (marine, lacustrine, deltaic and fluvial), as in soils, concentrations of 210 Pb and 210 Po are commonly derived from a combination of natural and anthropogenic sources. Enhanced concentrations of both radionuclides are reported in media from a variety of industrial operations, including uranium mill tailings, waste from phosphoric acid production, oil and gas exploitation and energy production from coals, as well as in residues from the mining and smelting of uranium-bearing copper ores. Although the mineral hosts of the two radionuclides in most solid media are readily defined as those containing parent 238 U and 226 Ra, their distributions in some hydrothermal U-bearing ores and the products of processing those ores are much less well constrained. Much of the present understanding of these radionuclides is based on indirect data rather than direct observation and potential hosts are likely to be diverse, with deportments depending on the local geochemical environment. Some predictions can nevertheless be made based on the geochemical properties of 210 Pb and 210 Po and those of the intermediate products of 238 U decay, including isotopes of Ra and Rn. Alongside all U-bearing minerals, the potential hosts of 210 Pb and 210 Po may include Pb-bearing chalcogenides such as galena, as well as a range of sulphates, carbonates, and Fe-oxides. 210 Pb and 210 Po are also likely to occur as nanoparticles adsorbed onto the surface of other minerals, such as clays, Fe-(hydr)oxides and possibly also carbonates. In rocks, unsupported 210 Pb-and/or 210 Po-bearing nanoparticles may also be present within micro-fractures in minerals and at the interfaces of mineral grains. Despite forming under very limited and special conditions, the local-scale isotopic disequilibrium they infer is highly relevant for understanding their distributions in mineralized rocks and processing products.

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Section: Sulphates Carbonates and Other Potential Hostsmentioning

confidence: 99%

210Pb and 210Po in Geological and Related Anthropogenic Materials: Implications for Their Mineralogical Distribution in Base Metal Ores

et al. 2018

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“…This roughly twofold change in the partition coefficient may lead to large differences in the concentrations of dis-solved Ra when estimating its concentration with a parti-tion model. For example, Rosenberg et al (2013) investigated the co-precipitation of Ra and Ba in a large scale field system. In their case study, which is an evaporitic flow-through system, the effective partition coefficient, K 0 D;barite , was $1.…”

Section: B Rmentioning

confidence: 99%

“…Consequently, dissolved Ra concentration in the system was up to threefold higher than predicted if K 0 D;barite had been 1.8. Rosenberg et al (2013) concluded that the decrease in K 0 D;barite was a result of both ionic strength and the precipitation kinetics. However, a degree of uncertainty still exists when interpreting solid solution reactions based on field observations, due to the possible interferences of other factors such as different cations or dissolved organic matter.…”

Section: B Rmentioning

confidence: 99%

“…Co-precipitation of Ra and Ba in the barite structure (i.e., the formation of a Ra x Ba 1Àx SO 4 solid solution) is an important process that has been investigated widely during the last hundred years at different temperatures and salini-ties, and both on the laboratory and field scales (Doerner and Hoskins, 1925;Marques, 1934;Gordon and Rowley, 1957;Rosenberg et al, 2011bRosenberg et al, , 2013. The interest in a quan-titative description of this process is mainly twofold.…”

Section: Introductionmentioning

confidence: 99%

“…Traditionally, in such a model the propor-tion between the Ra/Ba ratios in the solid and aqueous phases is considered constant at equilibrium, and this proportion is represented by a partition coefficient, K D,barite = (Ra/Ba) solid /([Ra]/ [Ba]) solution (Curti, 1999). Re-sults of many studies on Ra and Ba coprecipitation show that the observed (i.e., effective) partition coefficient is not constant, but varies between 1 and 1.8 (see Table 2 in Rosenberg et al, 2011b) as a function of temperature (Gordon and Rowley, 1957), salinity (Rosenberg et al, 2011b(Rosenberg et al, , 2013 and the precipitation kinetics of the major component, barite (Rosenberg et al, 2011b(Rosenberg et al, , 2013. It is important to note that salinity and temperature affect also the equilibrium partition coefficient (in the same manner as a solubility constant of a mineral is affected by them); however, in the case of the Ra x Ba 1Àx SO 4 solid solution sys-tem, most of the variation in the effective partition coeffi-cient is due to kinetic effects (Rosenberg et al, 2011b(Rosenberg et al, , 2013.…”

Section: Introductionmentioning

confidence: 99%

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Nucleation and growth kinetics of RaxBa1−xSO4 solid solution in NaCl aqueous solutions

Rosenberg

Sadeh

Metz

et al. 2014

Geochimica et Cosmochimica Acta

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Co-precipitation of Ra and Ba in barite (i.e., the formation of a Ra x Ba 1Àx SO 4 solid solution) has long been established as an important process that has the potential to control Ra concentration. This process is commonly described by a distribution model. Ample studies have shown that the key parameter of this model, the partition coefficient, varies in the range of 1-2 as a function of temperature, salinity and precipitation kinetics of the RaxBa1 xSO4 solid solution. This roughly twofold change in the partition coefficient may lead to large differences in the concentration of dissolved Ra. The present study systematically investigated the co-precipitation kinetics of the Ra x Ba 1Àx SO 4 solid solution from aqueous solutions up to 5.9 mol kg-1 NaCl,circum-neutral pH and at ambient temperature. Laboratory batch experiments designed to follow the nucleation of the RaxBa1 xSO4 solid solution and the co-precipitation kinetics of Ba and Ra from aqueous solutions which were initially supersaturated with respect to barite (degree of supersaturation, =20 +-2 H 2 O The following empirical law describes the dependence of the activity-based partition coefficient, K '' D ,barite on the degree of supersaturation, b barite : K 00 D;barite ¼ð1:99 AE 0:05Þ Àð0:58 AE 0:06ÞÁlogðb barite Þ: This empirical law is in good agreement with other literature data. The outcomes of the empirical law are compared to the prediction of a model for the nucleation of two-dimensional islands.

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Contraintes hydrochimiques entre les Causses karstiques du Moyen atlas tabulaire et le bassin de Saïs (Maroc): implications de la circulation des eaux souterraines

et al. 2017

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Radium removal in a large scale evaporitic system

Cited by 21 publications

References 37 publications

210Pb and 210Po in Geological and Related Anthropogenic Materials: Implications for Their Mineralogical Distribution in Base Metal Ores

210Pb and 210Po in Geological and Related Anthropogenic Materials: Implications for Their Mineralogical Distribution in Base Metal Ores

Nucleation and growth kinetics of RaxBa1−xSO4 solid solution in NaCl aqueous solutions

Contraintes hydrochimiques entre les Causses karstiques du Moyen atlas tabulaire et le bassin de Saïs (Maroc): implications de la circulation des eaux souterraines

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