EP 3071719 A1 20160928 - METHOD FOR RECOVERING RARE EARTH METALS FROM WASTE SULPHATES
Title (en)
METHOD FOR RECOVERING RARE EARTH METALS FROM WASTE SULPHATES
Title (de)
VERFAHREN ZUR RÜCKGEWINNUNG VON SELTENERDMETALLEN AUS SULPHAT-ABFÄLLEN
Title (fr)
PROCÉDÉ POUR LA RÉCUPÉRATION DE MÉTAUX TERRES RARES À PARTIR DE DÉCHETS SULFATES
Publication
Application
Priority
- FI 20136167 A 20131122
- FI 2014050891 W 20141121
Abstract (en)
[origin: WO2015075317A1] The present invention relates to a method for recovering rare earth metals from waste sulphate materials, such as waste gypsum, which is a known secondary resource of rare earth metals and widely present e.g. in areas, where industrial phosphate production takes place. The present invention combines sulphate reduction treatment, such as bioreduction with sulphate reducing bacteria, and magnetic separation, which is based on an exceptionally high magnetic susceptibility of rare earth compounds compared to e.g. calcium compounds in such reductively pretreated gypsum precipitate.
IPC 8 full level
C22B 59/00 (2006.01); B03C 1/00 (2006.01); B03C 1/015 (2006.01); B03C 1/02 (2006.01); C01F 17/288 (2020.01); C02F 1/48 (2006.01); C22B 3/18 (2006.01); C22B 7/00 (2006.01); C02F 101/10 (2006.01)
CPC (source: EP FI)
B03C 1/002 (2013.01 - FI); B03C 1/015 (2013.01 - EP FI); B03C 1/02 (2013.01 - EP FI); C01F 17/288 (2020.01 - EP FI); C02F 1/488 (2013.01 - FI); C22B 3/18 (2013.01 - EP FI); C22B 7/00 (2013.01 - EP FI); C22B 59/00 (2013.01 - EP FI); Y02P 10/20 (2015.11 - EP)
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
WO 2015075317 A1 20150528; CA 2930349 A1 20150528; CN 105765091 A 20160713; CN 105765091 B 20181009; EP 3071719 A1 20160928; EP 3071719 A4 20170809; FI 125550 B 20151130; FI 20136167 A 20150523
DOCDB simple family (application)
FI 2014050891 W 20141121; CA 2930349 A 20141121; CN 201480063966 A 20141121; EP 14863833 A 20141121; FI 20136167 A 20131122