Open AccessApplication of solid-liquid extraction with organic acids for recovery of precious metal from technological waste in disuse
Author(s) -
Antonio Dos santos,
Dinalva Schein,
Mauro Marchetti,
Estela Bresolin Pereira,
Arthur Rolim Stasiak
Publication year - 2020
Language(s) - English
Resource type - Journals
ISSN - 2411-2933
DOI - 10.31686/ijier.vol8.iss8.2531
Subject(s) - aqua regia , leaching (pedology) , gold extraction , citric acid , precious metal , acetic acid , metal , chemistry , waste management , environmental science , materials science , metallurgy , organic chemistry , engineering , cyanide , soil science , soil water
The electro and electronic industry has been increasing gradually, causing an increase in the generation of waste of electrical and electronic equipment, which have several components that have added value such as - for example - gold. Aiming at environmental protection, measures are sought for the recovery of these metals, through tests with several technologies such as leaching. This consists in separating the component from the solid part, transferring it to the liquid part, using acids. It is necessary to study acids that are less harmful to the environment. Thus, microprocessors of obsolete computers were collected, their characterization was carried out and the elements present in the pins were identified. After the characterization, the leaching stage was carried out, firstly with aqua regia; then with acetic and citric acids. The leaching results presented about 10 mg / L of gold with aqua regia and about 0.5 mg / L with citric acid.