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Gravity Separation
Is there a general rule of thumb for choosing bath densities while conducting float-sink analysis for coal?

I'm wondering if someone has experience around choosing bath densities for different coal types and can link me to any literature around this.


Froth Flotation, Reagents
Can depressants like nigrosine result in metal recovery loss?

Has anyone quantified the loss in recovery when adding nigrosine as a depressant for carbon in zinc flotation?