Example 1. You should evaluate the thermodynamic probability of sorption of ethyl xanthate on the unoxidized (unmodified) surface of galena:
Since ΔG0
is positive, the flow of this process is thermodynamically
incredible. This is confirmed by the practice of the flotation. The
mineral surface should be partially oxidized to fix the xanthate.
This is imperative.
Example 2. You should rate thermodynamic probability of xanthate sorption after the partial oxidation of the surface of galena:
Since ΔG0 is negative in both cases, the flow of this process is thermodynamically probable. The mineral surface should be partially oxidized to fix the xanthate.
P.S. Sorption of flotation reagents at interfaces occurs spontaneously and is accompanied by a loss of free surface energy. Changing the standard free energy Gibbs ΔG0 in the sorption of flotoreagents at the interface is described by Gibbs [1].
For the thermodynamic probable processes accompanied by energy loss, the value of Gibbs free energy ΔG0 should have a negative value.
Example 2. You should rate thermodynamic probability of xanthate sorption after the partial oxidation of the surface of galena:
Since ΔG0 is negative in both cases, the flow of this process is thermodynamically probable. The mineral surface should be partially oxidized to fix the xanthate.
P.S. Sorption of flotation reagents at interfaces occurs spontaneously and is accompanied by a loss of free surface energy. Changing the standard free energy Gibbs ΔG0 in the sorption of flotoreagents at the interface is described by Gibbs [1].
For the thermodynamic probable processes accompanied by energy loss, the value of Gibbs free energy ΔG0 should have a negative value.
- FUNDAMENTALS OF THE THEORY OF FLOTATION
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