摘要
The rate of batch extraction of gallium from alkaline aqueous solution was studied by adding 2-ethylhexanoic acid in organic phase containing 7-substituted-8-hydroxyquinoline(extractant N601), n-decanol and kerosene.The extraction of Ga can be considered as a pseudo-homogeneous first-order reac- tion.The neutralization and distribution of organic acid between phases during the extraction were studied. The effect of 2-ethylhexanoic acid on the protonation of N601 is insignificant.The extraction of HCl during the stripping of gallium is mainly dependent on the concentration of aqueous hydrochloric acid and the con- tent of N601.Under the given conditions of temperature and N601 content,the acidity of organic phase is a linear function of the concentration of carboxylic acid in organic phase and the concentration of hydrochloric acid in equilibrium aqueous phase,if the latter is 1.9～5.6 mol/L.
The rate of batch extraction of gallium from alkaline aqueous solution was studied by adding 2-ethylhexanoic acid in organic phase containing 7-substituted-8-hydroxyquinoline(extractant N601), n-decanol and kerosene.The extraction of Ga can be considered as a pseudo-homogeneous first-order reac- tion.The neutralization and distribution of organic acid between phases during the extraction were studied. The effect of 2-ethylhexanoic acid on the protonation of N601 is insignificant.The extraction of HCl during the stripping of gallium is mainly dependent on the concentration of aqueous hydrochloric acid and the con- tent of N601.Under the given conditions of temperature and N601 content,the acidity of organic phase is a linear function of the concentration of carboxylic acid in organic phase and the concentration of hydrochloric acid in equilibrium aqueous phase,if the latter is 1.9～5.6 mol/L.
