Scandium and Titanium Recovery from Bauxite Residue by Direct Leaching with a Bronsted Acidic Ionic Liquid

被引：32

作者：

Bonomi, Chiara ^{[1
]}

Alexandri, Alexandra ^{[1
]}

Vind, Johannes ^{[1
,2
]}

Panagiotopoulou, Angeliki ^{[3
,4
]}

Tsakiridis, Petros ^{[1
]}

Panias, Dimitrios ^{[1
]}

机构：

[1] Natl Tech Univ Athens, Sch Min & Met Engn, Iroon Polytech 9,Zografou Campus, Athens 15780, Greece

[2] Mytilineos SA, Met Business Unit, Dept Continuous Improvement & Syst Management, Aluminium Greece Plant, Agios Nikolaos 32003, Viotia, Greece

[3] Natl Ctr Sci Res Demokritos, Inst Biosci & Applicat, Patr Gregoriou E & 27 Neapoleos Str, Athens 15310, Greece

[4] Natl Ctr Sci Res Demokritos, Inst Biosci & Applicat, Neapoleos 10, Athens 15310, Greece

来源：

METALS | 2018年 / 8卷 / 10期

基金：

欧盟地平线“2020”;

关键词：

bauxite residue; red mud; ionic liquids; scandium recovery; titanium recovery; RED MUD; RARE-EARTHS; EXTRACTION;

D O I：

10.3390/met8100834

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this study, bauxite residue was directly leached using the BrOnsted acidic ionic liquid 1-ethyl-3-methylimidazolium hydrogensulfate. Stirring rate, retention time, temperature, and pulp density have been studied in detail as the parameters that affect the leaching process. Their optimized combination has shown high recovery yields of Sc, nearly 80%, and Ti (90%), almost total dissolution of Fe, while Al and Na were partially extracted in the range of 30-40%. Si and rare earth element (REEs) dissolutions were found to be negligible, whereas Ca was dissolved and reprecipitated as CaSO4. The solid residue after leaching was fully characterized, providing explanations for the destiny of REEs that remain undissolved during the leaching process. The solid residue produced after dissolution can be further treated to extract REEs, while the leachate can be subjected to metal recovery processes (i.e., liquid-liquid extraction) to extract metals and regenerate ionic liquid.

引用

页数：17

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