PROCEDURE FOR EXTRACTION OF SCANDIUM OUT OF SCANDIUM CONTAINING SOLUTIONS, SOLID EXTRACTANT (SOLEX) FOR ITS EXTRACTION AND PROCEDURE FOR PRODUCTION OF SOLEX Russian patent published in 2011 - IPC C22B59/00 C22B3/24 C22B3/26 C08F2/00 

FIELD: metallurgy.

SUBSTANCE: procedure for extraction of scandium consists in extracting scandium out of producing sulphuric acid solution whereto alkali agent is added before extraction to bring its acidity to pH equal to 2.5-3.0 on solid extractant (SOLEX) with raised selectivity to scandium. Further, scandium is re-extracted from the SOLEX after complete extraction by processing it with solution of fluorine-hydrogen acid at ratio 1:3 of water and organic phases. Successively, scandium fluoride is settled and the SOLEX is washed. Before re-extraction the SOLEX is after-saturated with a part of concentrated solution of scandium produced from preceding re-extraction. Extraction and re-extraction are performed in the same sorption unit; spent sulphuric acid solution and the SOLEX washed with water are returned for extraction of scandium. The procedure for production of the SOLEX consists in synthesis of styrene-di-vinyl-benzene with di-2-ethyl-hexyl ether of phosphoric acid at presence of initiator of copolymerisation. As initiator there is used di-nitrile of azo-di-izobutyric acid to increase strength properties of granules of extractant at the following ratio, wt %: di-2-ethyl-hexyl ether of phosphoric acid - 40-60, di-nitrile of azo-di-izobutyric acid - 3-5, ammine-methyl-phosphonic acid - 3-5, styrene-di-vinyl-benzene - the rest. Produced mixture is poured with distilled water and heated at equal ratio of water and organic phases, overflowed through a sieve and rapidly cooled at continuous mixing with formation of porous granules of the SOLEX which are cut and dried.

EFFECT: efficient process for extraction of scandium.

4 cl, 1 tbl, 4 ex