Good points. It appears you are right in that they are "diagnostic tests", i.e, pass/fail & best case extraction. Will be interesting to see what they do with the next round of work and results of not pulverising + running higher L/S ratio (they used 20:1, I'd imagine commercial process would use around 2:1). Obviously there remains upside in changing lixiviants and using lower pH as well in the next round. Quite early days still.
Ann: Outstanding Ionic Clay Recoveries from Metallurgical Results, page-75
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