Menetelmä harvinaisten maametallien talteenottamiseksi jätesulfaateista; Förvarande för återvinning av sällsynta jordmetaller från avfallssulfater

Translated title of the contribution: Method for recovering rare earth metals from waste sulphates

Pertti Koukkari (Inventor), Jarno Mäkinen (Inventor), Malin Bomberg (Inventor), Anna Lehtonen (Inventor), Mona Arnold (Inventor)

Research output: PatentPatent


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.

Patent family as of 12.11.2021
CA2930349 AA 20160511 CA20142930349 20141121      
CN105765091 A 20160713 CN201480063966 20141121      
CN105765091 B 20181009 CN201480063966 20141121      
EP3071719 A1 20160928 EP20140863833 20141121      
EP3071719 A4 20170809 EP20140863833 20141121      
FI125550 B 20151130 FI20130006167 20131122      
FI20136167 A 20150523 FI20130006167 20131122      
WO15075317 A1 20150528 WO2014FI50891 20141121      
ZA201603255 A 20180228 ZA20160003255 20160513

Link to current patent family on right 

Translated title of the contributionMethod for recovering rare earth metals from waste sulphates
Original languageMultiple
Patent numberFI20136167
IPCC02F 101/ 10 A N
Priority date22/11/13
Publication statusPublished - 23 May 2015
MoE publication typeH1 Granted patent


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