PHENOL-FORMALDEHYDE BASED WEAK-BASE RESINS FOR THE RECOVERY OF GOLD

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Abstract
In a process for the recovery of gold-cyanide with a weak-base resin, it is desirable that the resin should load gold at the natural pH of the leach liquor and be stripped by an aqueous alkali. The present work explores, for such a resin, the potential of a phenol-formaldehyde polymer matrix which, it was thought, would facilitate the stripping of gold. Unexpected loading behaviour of a resin with an imidazoline active group is rationalized from results obtained during its titration. It is concluded that a phenol-formaldehyde matrix might limit the upper pH at which a resin can load, and its effect on pH functionality will depend on the concentration of phenolic groups. Magnetic separation is a possible technique for separating a resin from a pulp. The method of synthesis of phenol-formaldehyde polymers can be adapted to prepare composite resins containing magnetic materials.

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