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Abstract
Gravity, magnetic and flotation methods for pre-concentrating rare elements from coal ash and iron-oxide tailings were compared. Gravity recovered 22–34 % of rare earths (352–407 g/t), magnetic separation 11–37 % (328–516 g/t), flotation the most. Germanium is finely dispersed, forms no discrete heavy or magnetic mineral and is not concentrated physically, needing sorption pre-treatment; a combined physical chemical scheme is proposed.
References
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