METHOD OF ASH TREATMENT, FLY ASH IN PARTICULAR Russian patent published in 2017 - IPC C22B3/04 C22B7/00 C22B11/00 C22B59/00 

FIELD: chemistry.

SUBSTANCE: method comprises the separation of precious metals from rare earth elements. In this case, precious metals and rare earth elements are separated in two extraction processes. In the first process (10) extracting precious metals dissolve or oxalic acid aqueous solution (12) containing oxalate. Then in the second process (11) extraction to separate rare earths. Solutions received during the first process (10) and the second extraction process (11) extraction, are besieged in two stages, during the first stage (13) precious metals are besieged and in the second phase (16) rare earth elements are besieged. The first process (10) of extraction and the second extraction process (11) and first stage (13) and second phase (16) combined with each other.

EFFECT: increasing the efficiency of the process by extracting more valuable elements.

12 cl, 3 dwg