Solubility behavior of rare earths with ammonium carbonate and ammonium carbonate plus ammonium hydroxide: Precipitation of their peroxicarbonates

Vasconcellos, Mari E. de; Rocha, Soraya M.R. da; Pedreira, W.R; Queiroz, Carlos Alberto da Silva; Abrão, A.

doi:10.1016/j.jallcom.2007.04.163

Cited by 32 publications

(14 citation statements)

References 9 publications

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“…In accordance with recent published data [24,25], rare earth elements may form stable peroxy-carbonate compounds in peroxide-containing aqueous environments. Hence, the existence of a peroxy-carbonate species La 2 O 2 (CO 3 ) 2 also in a basic molten carbonate, where peroxide ions are abundant, is worth to be examined.…”

Section: Discussionsupporting

confidence: 91%

Lux-Flood Basicity of Mixed La2O3-Alkali Molten Carbonates Determined by Analysis of their Oxygen Solubility Properties

Frangini¹

2009

TOPCJ

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Abstract:The Lux-Flood basicity of La 2 O 3 -containing alkali molten carbonate mixtures has been quantitatively estimated by a gas solubility method based on the use of acidic gaseous O 2 for the titration of the oxide concentration in the melt. The amount of gaseous oxygen dissolved in the melt in form of peroxide ion has been taken as a quantitative probe for the carbonate basicity. Results demonstrate that addition of a 0.5 mol % of La 2 O 3 to alkali carbonates is able to dramatically increase the melt basicity and that the degree of this basicity change mostly depends on the melt composition in terms of the average cation size of the alkali carbonate mixture. Plausible dissolution paths of La 2 O 3 in molten carbonates under both acidic and basic regimes are also discussed.

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Section: Discussionsupporting

confidence: 91%

Lux-Flood Basicity of Mixed La2O3-Alkali Molten Carbonates Determined by Analysis of their Oxygen Solubility Properties

Frangini¹

2009

TOPCJ

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“…Rare earth elements are readily subjected to precipitation with carbonate [27,28] especially at high pHs. Re-carbonates are ideal precipitates, since carbonates are readily available, relatively less expensive than other precipitants, and precipitates can be easily dissolved in a mild acid for further treatments of REEs in subsequent processes of purification.…”

Section: Carbonate Systemmentioning

confidence: 99%

Characteristics of Precipitation of Rare Earth Elements with Various Precipitants

Han

2020

Minerals

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The effective and selective leaching of rare earth elements (REEs) from various sources is frequently possible in practice by adopting a carefully coordinated strategy incorporating a selective precipitation of these elements from undesired ones in solution. In this study, the behavior of chemical precipitation of REEs with commonly used precipitants such as sulfate, carbonate, fluoride, phosphate, and oxalate was examined using thermodynamic principles and calculations. It was found that the pH of the system has a profound effect on determining particular chemical species of precipitants, which are subsequently responsible for the precipitation of REEs. The role of various anions such as Cl−, NO3−, and SO42− derived from the acid used in the leaching process on the precipitation behavior of REEs was examined. These anions form complexes with REEs and display a very positive effect on the precipitation behavior. The nitrate environment exhibits most conducive to precipitation followed by sulfate and then chloride.

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“…It has been understood since the beginnings of rare earth carbonate synthesis that the double carbonates form if a rare earth carbonate is allowed to sit in a solution of the alkali carbonate/bicarbonate salt [36][37][38][39]. Ammonium carbonate/bicarbonate solutions do not result in a double carbonate, but rather result in the formation of the perioxycarbonate [105]. It should be noted that the dissolution process occurs more rapidly if the excess salt solution is that of the bicarbonate salt.…”

Section: Precipitationmentioning

confidence: 99%

Trends in Structure and Thermodynamic Properties of Normal Rare Earth Carbonates and Rare Earth Hydroxycarbonates

et al. 2018

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A general overview of the trends in structural and thermodynamic properties that have been identified within the hydrated normal rare earth carbonates and the rare earth hydroxycarbonates is presented. Based upon available literature, we demonstrate the trends in crystallographic unit cell parameters, thermal stability, aqueous solubility, and thermochemical properties. These trends can be attributed to both the unique chemistry and strong similarity of the rare earth elements. There are also inconsistent trends that signal research needs to better understand the structure-energy relationships of the rare earth carbonates.

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Solubility behavior of rare earths with ammonium carbonate and ammonium carbonate plus ammonium hydroxide: Precipitation of their peroxicarbonates

Cited by 32 publications

References 9 publications

Lux-Flood Basicity of Mixed La2O3-Alkali Molten Carbonates Determined by Analysis of their Oxygen Solubility Properties

Lux-Flood Basicity of Mixed La2O3-Alkali Molten Carbonates Determined by Analysis of their Oxygen Solubility Properties

Characteristics of Precipitation of Rare Earth Elements with Various Precipitants

Trends in Structure and Thermodynamic Properties of Normal Rare Earth Carbonates and Rare Earth Hydroxycarbonates

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