| To recover platinum and rhenium from expired petroleum reforming catalysts, D296 anion exchange resin was selected for comparison. The effects of adsorption time, temperature, acidity, and flow rate on the adsorption of platinum and rhenium in hydrochloric acid sulfuric acid leachate were studied. Through dynamic adsorption and desorption experiments of platinum and rhenium, the saturated adsorption capacity of platinum and rhenium and the bed volume of desorption solution required for complete desorption were determined. The results showed that D296 resin can preferentially adsorb platinum at an acidity of 5 mol/L, while rhenium is hardly adsorbed. When the acidity is 0.5 mol/L, rhenium can be quantitatively adsorbed. The saturated adsorption capacities (vs dry resin) of platinum and rhenium are 170 and 120 mg/g, respectively. Platinum and rhenium adsorbed on the resin can be desorbed with 15% perchloric acid and 5 mol/L hydrochloric acid, respectively. Complete desorption requires 5.5 and 5 bed volumes of desorption solution, respectively. D296 resin can be used for the separation and purification of platinum rhenium. |
