Journal
MINERALS ENGINEERING
Volume 176, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.mineng.2021.107349
Keywords
beta-spodumene; Sodium carbonate; Solid-state reaction; Lithium carbonate
Funding
- CONICET (the National Scientific and Technical Research Council)
- CNEA (the National Commission of Atomic Energy)
- National University of Cuyo (UNCuyo-Balseiro Institute)
- ANPCyT (National Agency of Scientific and Technological Promotion)
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The role of Na2CO3 in solid-state lithium extraction from beta-spodumene was evaluated under dynamical and static heating conditions. The study found that sodium aluminosilicate phases could be formed and that the molar ratio of LiAlSi2O6:Na2CO3 influenced the product species and yield.
The aim of this study is to evaluate the role of Na2CO3 in solid-state lithium extraction from beta-spodumene (beta-LiAlSi2O6) under both dynamical and static heating conditions. Different samples of beta-spodumene were used: one obtained from a mineral sample and another synthesized from oxides/carbonates reagents. Structural, chemical, microstructural and thermal analysis techniques were employed to analyze the samples before and after reaction. Experimental results show that lithium could be extracted from beta-spodumene structure through sodium aluminosilicate phases formation under air atmosphere: NaAlSi2O6 at low temperature (similar to 400 degrees C) and NaAlSiO4 at high temperature (above 600 degrees C). The comparison between both beta -spodumene samples reveals the formation of the same crystalline phases under both dynamical and static heating conditions, although mixtures of Na2CO3 with synthetic beta -spodumene show minor reactivity at low temperature. In addition, the study of different molar ratios of LiAlSi2O6:Na2CO3 evidences that a major amount of NaAlSi2O6 phase is obtained at 400 degrees C for the 2:1 mol ratio. Lithium can be recovered by additional dissolution and drying stages in the form of lithium carbonate Li2CO3 reaching a high yield. These results are in agreement with thermodynamical calculations obtained for the LiAlSi2O6-Na2CO3 system.
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