The separation of gold by selective extraction of HAuBr(4) using a poly(tetramethylene) ether glycol impregnated filter.
The separation of gold(III) by selective extraction on an organic- impregnated filter (OIF) was studied. Gold was found to be rapidly extracted into the active polytetramethylene ether glycol (polyTHF) layer of the filter from strongly acidic solutions of HBr, as the HAuBr(4) complex. Quantitative extraction of gold from solution was obtained with flow rates up to 600 ml min(-1) through the 10.75 cm(2) OIF and at ng ml(-1) concentration levels. The extraction is shown to be dependent on the solution flow rate and HBr concentration as well as the filter pore size, thickness and porosity. Gold can be eluted from the filter by converting it into the AuBr(4)(-) complex using a KBr solution. The separation of gold is demonstrated from simple binary metal mixtures involving iron and cadmium, as well as from a more complicated matrix, gold ore solution.
Oleschuk
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Department of Chemistry, University of Manitoba, Winnipeg, MB, R3T 2N2, Canada.
Chow
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