Abstract
This study is concerned with direct cristallization of ammonium uranyl carbonate (AUC) from a uranium loaded organic phase (30% TBP in kerosene), with ammonium carbonate (NH4)2 CO3. The effects of operating conditions (NH4)2 CO3 concentration, flowration residence time, temperature on the physical properties of AUC crystals (particle size distribution, specific area, density..) are reported. All products were identified (both by chemical analysis, X-Ray diffraction) as being ammonium uranyl ratio and (NH4)2 CO3 concentration favor the formation of fine AUC grains and aggregates. This is due mainly to the high concentration of (NH4)+ in the system which leads to a high solution supersaturation and consequently to a rapid formation rate of crystal (germination). The reverse phenomenon is observed at low phase ratio and (NH4)2 CO3 concentration, where germination and crystal growth ara slow and the product is mainly monocrystal. In the intermediate range, a mixture of polycrystal and aggregates is obtained. Residence time and temperature are also shown to have an effect on the processes (the effect of time being more important than temperature).
Yahi, Boussad
[1]
- Centre de Developpement des Materiaux, Algiers (Algeria). Dept. de Simulation des Procedes Chimiques
Citation Formats
Yahi, Boussad.
An effect of re-extraction crystallization parameters on physical and chemical properties of AUC; Influence des parametres de reextraction-cristallisation sur les proprietes physico-chimiques des cristaux d`AUC.
Algeria: N. p.,
1990.
Web.
Yahi, Boussad.
An effect of re-extraction crystallization parameters on physical and chemical properties of AUC; Influence des parametres de reextraction-cristallisation sur les proprietes physico-chimiques des cristaux d`AUC.
Algeria.
Yahi, Boussad.
1990.
"An effect of re-extraction crystallization parameters on physical and chemical properties of AUC; Influence des parametres de reextraction-cristallisation sur les proprietes physico-chimiques des cristaux d`AUC."
Algeria.
@misc{etde_10156723,
title = {An effect of re-extraction crystallization parameters on physical and chemical properties of AUC; Influence des parametres de reextraction-cristallisation sur les proprietes physico-chimiques des cristaux d`AUC}
author = {Yahi, Boussad}
abstractNote = {This study is concerned with direct cristallization of ammonium uranyl carbonate (AUC) from a uranium loaded organic phase (30% TBP in kerosene), with ammonium carbonate (NH4)2 CO3. The effects of operating conditions (NH4)2 CO3 concentration, flowration residence time, temperature on the physical properties of AUC crystals (particle size distribution, specific area, density..) are reported. All products were identified (both by chemical analysis, X-Ray diffraction) as being ammonium uranyl ratio and (NH4)2 CO3 concentration favor the formation of fine AUC grains and aggregates. This is due mainly to the high concentration of (NH4)+ in the system which leads to a high solution supersaturation and consequently to a rapid formation rate of crystal (germination). The reverse phenomenon is observed at low phase ratio and (NH4)2 CO3 concentration, where germination and crystal growth ara slow and the product is mainly monocrystal. In the intermediate range, a mixture of polycrystal and aggregates is obtained. Residence time and temperature are also shown to have an effect on the processes (the effect of time being more important than temperature).}
place = {Algeria}
year = {1990}
month = {Jul}
}
title = {An effect of re-extraction crystallization parameters on physical and chemical properties of AUC; Influence des parametres de reextraction-cristallisation sur les proprietes physico-chimiques des cristaux d`AUC}
author = {Yahi, Boussad}
abstractNote = {This study is concerned with direct cristallization of ammonium uranyl carbonate (AUC) from a uranium loaded organic phase (30% TBP in kerosene), with ammonium carbonate (NH4)2 CO3. The effects of operating conditions (NH4)2 CO3 concentration, flowration residence time, temperature on the physical properties of AUC crystals (particle size distribution, specific area, density..) are reported. All products were identified (both by chemical analysis, X-Ray diffraction) as being ammonium uranyl ratio and (NH4)2 CO3 concentration favor the formation of fine AUC grains and aggregates. This is due mainly to the high concentration of (NH4)+ in the system which leads to a high solution supersaturation and consequently to a rapid formation rate of crystal (germination). The reverse phenomenon is observed at low phase ratio and (NH4)2 CO3 concentration, where germination and crystal growth ara slow and the product is mainly monocrystal. In the intermediate range, a mixture of polycrystal and aggregates is obtained. Residence time and temperature are also shown to have an effect on the processes (the effect of time being more important than temperature).}
place = {Algeria}
year = {1990}
month = {Jul}
}