Abstract
Research results were presented for gold sorption from cyanide solutions by ANS-3 macroporous anionite based on styrene-divinyl benzene copolymer. Equilibrium data on gold sorption from a model cyanide solution agreed with the modified Langmuir-Freundlich equation within the studied gold concentrations. Gold stripping results with alkaline cyanide solution were given. Optimal structure of polymer matrix provides high mechanical and osmotic strength of ANS-3 anionite. The anionite is not subjected to an osmotic shock in alkaline solution allowing its application in hydrometallurgical processes including sorption from pulps.
Highlights
Exhaustion of gold-bearing placers, processing of primary ore deposits with low gold content and complicated composition and recoverable materials into the gold processing requires new, more efficient technologies
ANS-3 anionite manufactured by Smoly State Enterprise is an analogue of this resin
ANS-3 is a weak base anion exchanger manufactured by Smoly State Enterprise on the basis of macroporous styrene-divinyl benzene copolymer
Summary
Exhaustion of gold-bearing placers, processing of primary ore deposits with low gold content and complicated composition and recoverable materials into the gold processing requires new, more efficient technologies. AM-2B medium base anionite manufactured by Smoly State Enterprise is among the resins widely used in this gold recovery technology. Considerable simplification of the gold recovery flowsheet is associated with application of weak base anionites, which allow gold elution using alkali liquors. In this case, gold stripping with alkaline solutions is economically and environmentally beneficial over its desertion by acidic reagents. Purolite S992 anionite manufactured by Purolite is among such sorption materials and is regenerated with one treatment with alkaline-cyanide solution at a temperature of 40 °С to 50 °С with further water washing [3,4,5]. ANS-3 anionite manufactured by Smoly State Enterprise is an analogue of this resin. The present paper deals with the study of gold sorption from model cyanide solutions with ANS-3 anionite
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