solvent extraction technique meaning in Hindi

Examples

1. Using methods developed by Frank Spedding in the 1940s, ion-exchange used to be the only practical way to separate them in large quantities, until the advent of solvent extraction techniques that can be scaled up enormously.
2. Whereas mischmetal  a mixture of rare earth metals containing about 1 % of samarium  has long been used, relatively pure samarium has been isolated only recently, through ion exchange processes, solvent extraction techniques, and electrochemical deposition.