Abstract:
The paper presents a study on the statistical modeling of the results obtained in the selective recovery of gold
from hydrochloric solutions using Amberlite XAD-7 ion-exchange resin. Experimental tests were conducted on real
solutions obtained following selective leaching of gold from different metallurgical wastes, through wet chlorination. The
influence of several variables such as: acidity of the working solution, the flow through the bed , temperature, eluent
acidity, the flow rate and the acetone/hydrochloric acid ratio has been studied. As a result of the experimental tests
performed, it was established that the optimum conditions for the adsorption step were: solution acidity 2.5M HCl,
solution flow rate through the bed 1.11 ·10-9 m3/s (3Bev/h) and a room temperature. The loaded resin was eluted with an
mixture of organic solvent (acetone) and hydrochloric acid. The process efficiency of the gold elution from the Amberlite
XAD-7 resin is higher as the fictive flow rate of the eluent is lower and increases with the increase of the eluent acidity
and with the increase of the acetone quantity in the eluent (with the increase of the volumetric ratio between acetone and
hydrochloric acid). The gold recovery efficiency based on the Amberlite XAD-7 selective ion-exchange resin was over
99.8%.
Keywords:
gold, chloride media, ion exchange resin, model
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