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Study on Extraction Performance of Cyanex923 for Lanthanum(III) in Nitrate Medium

Wen Ma

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Abstract

In the present work,the extraction performance of neutral extractant Cyanex923(a mixture of straight chain triakylphosphine oxide) for light rare earth La(Ⅲ) had been investigated.The effects of La(Ⅲ),Cyanex923 and NO-3 concentration on La(Ⅲ) extraction were studied,respectively.The extraction mechanism was suggested based on the slope analysis and the extraction equilibrium equation was obtained.The effect of temperature on La(Ⅲ) extraction was investigated.From the temperature dependent data,the thermodynamic parameter values(△H,△S and △G) were calculated by Van′t Hoff equation during temperature of 298 K to 323 K.The stripping behavior of loaded Cyanex923 was investigated by nitric acid of different concentrations.It was found that when nitric acid concentration was more than 1.0 mol·L-1,the stripping rate could rech 100%.

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What this paper is about

In the present work,the extraction performance of neutral extractant Cyanex923(a mixture of straight chain triakylphosphine oxide) for light rare earth La(Ⅲ) had been investigated.The effects of La(Ⅲ),Cyanex923 and NO-3 concentration on La(Ⅲ) extraction were studied,respectively.The extraction mechanism was suggested based on the slope analysis and the extraction equilibrium equation was obtained.The effect of temperature on La(Ⅲ) extraction was investigated.From the temperature dependent data,the thermodynamic parameter values(△H,△S and △G) were calculated by Van′t Hoff equation during temperature of 298 K to 323 K.The stripping behavior of loaded Cyanex923 was investigated by nitric acid of different concentrations.It was found that when nitric acid concentration was more than 1.0 mol·L-1,the stripping rate could rech 100%.

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Available abstract

In the present work,the extraction performance of neutral extractant Cyanex923(a mixture of straight chain triakylphosphine oxide) for light rare earth La(Ⅲ) had been investigated.The effects of La(Ⅲ),Cyanex923 and NO-3 concentration on La(Ⅲ) extraction were studied,respectively.The extraction mechanism was suggested based on the slope analysis and the extraction equilibrium equation was obtained.The effect of temperature on La(Ⅲ) extraction was investigated.From the temperature dependent data,the thermodynamic parameter values(△H,△S and △G) were calculated by Van′t Hoff equation during temperature of 298 K to 323 K.The stripping behavior of loaded Cyanex923 was investigated by nitric acid of different concentrations.It was found that when nitric acid concentration was more than 1.0 mol·L-1,the stripping rate could rech 100%.

Key concepts: Chemistry, Nitric acid, Extraction (chemistry), Stripping (fiber), Lanthanum, Nitrate, Analytical Chemistry (journal), Inorganic chemistry

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