Solubility and coprecipitation of barium and strontium nitrates in HNO3 solutions and multicomponent systems

Mishina, N. E.; Akhmatov, A. A.; Zilberman, B. Ya.; Shadrin, A. Yu.; Solyarskaya, E. I.

doi:10.1134/s1066362210050140

Cited by 11 publications

(5 citation statements)

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“…However, it shows a low proportion that is not higher than 10 %. The results obtained confirmed the work of Mishina et al [35] on the presence of adducts. Their study of the system Sr-HNO 3 -H 2 O established a curve describing the solubility of Sr depending on nitric acid concentration [35].…”

Section: Presence Of Hno 3 Adductssupporting

confidence: 92%

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Description of strontium precipitation in highly concentrated nitric acid

Baudat

Billard

Gautier

2022

J Radioanal Nucl Chem

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The precipitation of strontium in highly concentrated nitric acid is often used in standard radiochemical methods for 90 Sr separation. In this work, the description of Sr behavior in such conditions was studied in the point of speciation simulation. Standard speciation method based on Phreeqc software was considered but two problems underlined the limits of this approach to study this process: inappropriate ionic strength correction model (for I>10 M) and the particular dissociation of nitric acid. To overcome these issues, a multipurpose-fitting routine, Minuit, was used to fit chemical model parameters. A polynomial expression was also added to the model in order to take into account nitric acid dissociation. This alternative was proved successful to calculate the Sr precipitate in highly concentrated nitric acid. Comparison was made with the results obtained with Design of Experiment methodology.

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Section: Presence Of Hno 3 Adductssupporting

confidence: 92%

“…The results obtained confirmed the work of Mishina et al [35] on the presence of adducts. Their study of the system Sr-HNO 3 -H 2 O established a curve describing the solubility of Sr depending on nitric acid concentration [35]. The curve drops to low solubility values (under 0.1 M) above 8 M nitric acid concentration.…”

Section: Presence Of Hno 3 Adductssupporting

confidence: 92%

Description of strontium precipitation in highly concentrated nitric acid

Baudat

Billard

Gautier

2022

J Radioanal Nucl Chem

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“…Consequently, in this study, average values attributed to the influence of each parameter at the tested levels were calculated using the resulting data in Table 1. [26] The results of the calculations of the effects of tested levels of the examined factors on mean size of the Sr(NO 3 ) 2 particles are given in Figure 2. This figure actually displays the trends in the Sr(NO 3 ) 2 particle size upon altering the level of the factors.…”

Section: Optimizing the Spraying-in Non-solvent Processmentioning

confidence: 99%

“…Taguchi method, which uses preplanned orthogonal arrays (OAs), is composed of a series of trials whose results can be processed by routine mathematical operations to determine the independent role of each of the factors, under study, on the process . In fact, the Taguchi technique is capable to explain the significance of the explored factors in the process based on performing analysis of variance on the data obtained from preplanned experiments …”

Section: Introductionmentioning

confidence: 99%

“…[19][20][21][22] In fact, the Taguchi technique is capable to explain the significance of the explored factors in the process based on performing analysis of variance on the data obtained from preplanned experiments. [23][24][25][26] Particle size of product in spraying-in non-solvent process is powerfully affected by operation conditions and the exper-imental factors. [27,28] Therefore, inspection the role of diverse factors and their levels on the size of product and optimization of the process in order to fabricate the particles with minimum sizes need a large number of experiments, while application of the OAs preplanned by the Taguchi method could be very useful for optimization of the procedure and experimental conditions inside a limited number of tests.…”

Section: Introductionmentioning

confidence: 99%

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Fabrication of Strontium Nitrate Nanoparticles through a Spraying‐in Non‐Solvent Process Optimized by Taguchi Approach

2019

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The operation variables of the solution spraying‐in non‐solvent as a micronization process were effectively optimized through Taguchi robust design to obtain Sr(NO3)2 nanoparticles. The process conditions, which were evaluated at two levels, included the concentration of Sr(NO3)2, type of the non‐solvent, the approach of solution adding to the non‐solvent, temperature, type and ratio of the modifier. Analysis of variance (ANOVA) was used to quantitatively evaluate the role of these operating conditions on the size of resulting Sr(NO3)2 particles. It was found that spraying‐in non‐solvent technique can be adjusted to efficiently control the size of Sr(NO3)2 particles by optimizing the operating conditions. The results showed that at the concentration of 85% (w/v) Sr(NO3)2 in aqueous solution, using methanol as the non‐solvent, tuning 5 ∘C as the non‐solvent temperature, adding the solution by spraying, utilizing methyl ethyl ketone (MEK) as the modifier and 1:4 as the modifier/non‐solvent ratio lead to optimal results in terms of the properties of the Sr(NO3)2 nanoparticles. The experimental data confirmed that the formation of Sr(NO3)2 nanoparticles with an average size of about 38 nm under optimal process conditions.

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