Sulfoxide is a neutral extraetant containing oxygen.In 1962

it was discovered that sulfoxide may extract the metal ions

and until 1967 it was first applied to extract rare earth elements. Because of its properties with good extraction

extensive source and easy to be got

it seems quite a hopeful extractant of rare earth

likely to do well. This paper introduces some information of the research work on this field summarily at home and broad in recent years on its behaviour and mechanism of extraction

synergestic extraction and IR of extracted complex

etc.