Estudos comparativos entre carv？o ativado e resina de troca i？nica para adsor？？o de ouro, cobre e ferro

herein, the adsorption of gold, copper, and iron cyano complexes fromeffluents of t gold ore processing is presented. . for recovery, two alternatives were tested: weak-base ion - exchange resin and chemically modified activated carbon. the resin used was lewatit mp 62 from bayer s.a. chemical modification was carried out in two steps: nitration of commercial activated carbon followed by the reduction of the nitro group (no2) to amino group (nh2). adsorption testes revealed that activated carbon presented poorer efficiency in the recovery of au complexes in relation to untreated activated carbon, and that they did not adsorb either cu or fe complexes. resin recovered cu (99%) and fe(100%) and au (100%) complexes was the best.