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公开(公告)号：WO2023089234A1
公开(公告)日：2023-05-25
申请号：PCT/FI2022/050746
申请日：2022-11-15
Applicant: TEKNOLOGIAN TUTKIMUSKESKUS VTT OY
Inventor： RIIHIMÄKI, Teppo , OLLONQVIST, Pirkka-Pekka , KOUKKARI, Pertti
Abstract: The present invention relates to a process for recovering zinc and iron products from zinc- containing waste materials obtained from the zinc or steel industry, or both, by first treating the waste material(s) with strong acid, to convert any zinc ferrites into leachable compounds, and then leaching the acid-treated material, neutralizing the acid of the leach solution, recovering zinc from the neutralized ferrous iron-containing solution, recovering iron from the thus obtained solution, and circulating at least a fraction of the raffinate solution obtained from the iron recovery back to the leaching step.
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公开(公告)号：WO2015075317A1
公开(公告)日：2015-05-28
申请号：PCT/FI2014/050891
申请日：2014-11-21
Applicant: TEKNOLOGIAN TUTKIMUSKESKUS VTT OY
Inventor： KOUKKARI, Pertti , MÄKINEN, Jarno , BOMBERG, Malin , LEHTONEN, Anna , ARNOLD, Mona
IPC: C22B59/00 , C22B7/00 , C22B3/18 , B03C1/00 , B03C1/015 , B03C1/02 , C01F17/00 , C02F1/48 , C02F101/10
CPC classification number: C22B59/00 , B03C1/015 , B03C1/02 , C01F17/0087 , C22B3/18 , C22B7/00 , Y02P10/234 , Y02P10/238
Abstract: 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.
Abstract translation: 本发明涉及从诸如废石膏的废硫酸盐材料中回收稀土金属的方法，废石膏是已知的稀土金属二次资源，例如广泛存在。 在发生工业磷酸盐生产的地区。 本发明将硫酸盐还原处理如生物还原细菌与硫酸盐还原细菌相结合，并将磁性分离与稀土化合物相比具有极高的磁化率。 这种还原性预处理石膏中的钙化合物沉淀。
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公开(公告)号：WO2018109283A1
公开(公告)日：2018-06-21
申请号：PCT/FI2017/050901
申请日：2017-12-15
Applicant: TEKNOLOGIAN TUTKIMUSKESKUS VTT OY
Inventor： KOUKKARI, Pertti , RASTAS, Jussi , SAIKKONEN, Pekka , HINTIKKA, Väinö
Abstract: The present invention relates to a process for separating metals using a series of precipitations from waste materials of the zinc or steel industry, or both. The method is characterized in carrying out the precipitations using hydroxides or sulfur-containing chemicals selected from sulfates, sulfides, sulfur oxides and sulfites, or both, in order to obtain metal precipitates as well as an aqueous sulfur-containing solution, the latter optionally being recycled in the process, where after a final precipitate is carried to a thermal step, for forming
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