In response to your question "I don’t see reference in that link for GSC to lithium, it could be some other ore? "
It's right towards the top of that link https://www.flsmidth.com/en-gb/discover/mining-2019/kiln-vs-flash-calciner
"Pyro technology expert Timothy Kyle looks at the process of lithium extraction and the factors that need to be considered when choosing between kiln and flash calciner technologies.Q: What are the fundamentals of kiln and flash calciner technologies when it comes to lithium extraction?" etc
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