Abstract
Two important processes applied presently for the extraction of lithium from spodumene, the acid method and the lime method, are described in this paper. The less common method of chlorination roasting is also discussed. The behavior of tachydrite and spodumene, individually, during heating is investigated by differential thermal analysis. It was observed that tachydrite gradually loses its water of crystallization, becoming anhydrous at 573 K. Spodumene, on the other hand, is stable, showing a mass loss of 0.3 pct. around 693 K. At the reaction temperatures used in this study, the mixture can then be regarded as a mixture of spodumene plus MgO and CaCl/sub 2/.
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