US 12,351,472 B2
Method for extracting scandium from scandium-containing materials
Aleksandr Borisovich Kozyrev, Krasnoyarsk (RU); Ol'ga Viktorovna Petrakova, Krasnoyarsk (RU); Aleksandr Gennadievich Suss, Krasnoyarsk (RU); and Andrej Vladimirovich Panov, Krasnoyarsk (RU)
Assigned to OBSHCHESTVO S OGRANICHENNOY OTVETSTVENNOST'YU “OBEDINENNAYA KOMPANIYA RUSAL INZHENERNO-TEKHNOLOGICHESKIY TSENTR”, Krasnoyarsk (RU)
Filed by Obshchestvo S Ogranichennoy Otvetstvennost'yu “Obedinennaya Kompaniya Rusal Inzhenerno-Tekhnologicheskiy Tsentr”, Krasnoyarsk (RU)
Filed on Sep. 9, 2022, as Appl. No. 17/942,024.
Application 17/942,024 is a continuation of application No. PCT/RU2020/050298, filed on Oct. 28, 2020.
Claims priority of application No. RU2020109988 (RU), filed on Mar. 10, 2020.
Prior Publication US 2023/0020915 A1, Jan. 19, 2023
Int. Cl. C01F 17/10 (2020.01); C01F 17/212 (2020.01); C22B 3/12 (2006.01); C22B 3/22 (2006.01); C22B 59/00 (2006.01)
CPC C01F 17/10 (2020.01) [C01F 17/212 (2020.01); C22B 3/12 (2013.01); C22B 3/22 (2013.01); C22B 59/00 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A method for extracting scandium from scandium-containing materials, said method comprising:
slurring/re-slurring of a cake of a scandium-containing material with a mixture of sodium carbonate and sodium bicarbonate,
carbonization leaching of a slurry of the scandium-containing material with the mixture of sodium carbonate and sodium bicarbonate,
filtration of the leached slurry and a precipitation of a scandium concentrate from the obtained filtrate,
wherein:
the carbonization leaching of the slurry is carried out with a mixture of sodium carbonate and sodium bicarbonate having a Na2CO3 concentration of 130-350 g/dm3 and a NaHCO3 concentration of 2-100 g/dm3 at a pH value of 9.5-11.0,
maintaining the pH value in the slurry comprises gassing the slurry with a CO2-containing gas-air mixture, such that the scandium concentrate is precipitated in one stage by treating the solution resulting from the filtration of the slurry of the scandium-containing material with an alkaline solution.