从石煤酸浸液中萃取钒的工艺研究

研究了三正辛胺从石煤酸浸液中萃取钒的工艺过程 ,从萃取和反萃的 p H值、相比、有机相组成、澄清时间等方面进行了详细试验。研究表明 :用三正辛胺萃取钒时 ,其萃取率可达98%以上 ;而且易反萃 ,用 0 .5 M Na2 CO3反萃时 ,反萃率为 99.9%。经萃取后 ,浸出液中的钒可由每升几克富集到每升数十克以上 ,有利于后续的提钒工艺。

TECHNOLOGY OF EXTRACTING V2O5 FROM THE STONE COAL ACID-LEACHING SOLUTION WITH TOA

The technological process of extracting V 2O 5 from the stone coal acid leaching solution with TOA is reseached in this paper. Some parameters of extraction and anti extraction, such as pH, organic phase to aguo phase (O/A), the composition of organic phase and the setting time, are optimized by a series of tests, and the results show that the best pH is between 2.0~3.0 under the condition. Not only the extraction rate can be up to 98%, but also the anti extraction is easy. When 0.5 M Na 2CO 3 is taken as the anti extraction solvent, the yield will exceed 99.9%. By way of extraction, the concentration of V 2O 5 can be raised from 2~6 g/L to 50 g/L or more, and the major impurities are removed. These will be of advantage to precipitation.