Recovery of gold from ammonia-thiosulfate media with amberlite IRA-410 ionic exchange resin
DOI:
https://doi.org/10.3989/revmetalm.2006.v42.i5.33Keywords:
Adsorption, Elution, Gold, Resin, Thiosulfate, AmoniaAbstract
The adsorption and elution of gold in thiosulfate-ammonia media were studied at laboratory level using the Amberlite IRA-410 ionic exchange resin. Tests were carried out in a stirred reactor, maintaining constant temperature (25 ºC), with a volume of solution/mass of resin ratio of 833,3 ml/g and during 3 h. The variables tested were the following: pH (9-11), thiosulfate concentration (0-0,5 M), ammonia concentration (0-0,5 M) and selectivity in the presence of cupric ion. The obtained results indicate that gold adsorption was quick; the presence of thiosulfate decreased strongly the adsorption; and the presence of ammonia did not affect the adsorption mostly. The copper was in a certain measure a competitor of the gold, but its biggest negative effect was that acted as catalyst of the oxidizing reaction of thiosulfate (S2O3 2–) to tetrathionate (S4O6 2–) and trithionate (S3O6 2–), which can cause a partial elution of gold during the load stage. Also, the behavior of ClO– 4, SO3 2– and ClO– as eluents was studied in both gold and copper elution. These tests were also carried out in a stirred reactor, to constant temperature (25 ºC), with a volume of aqueous solution/mass of resin ratio of 200 ml/g and for 3 h. Results demonstrated that the copper was eluted more quickly that the gold in all the cases.
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