Extração de cobre de componentes eletrônicos por métodos hidrometalúrgico

Abstract

his study proposes a hydrometallurgical method for extracting copper from printed circuit boards (PCBs) of computers and mobile phones, using sulfuric acid (H₂SO₄) at three different concentrations (1, 2, and 3 mol/L) and hydrogen peroxide (H₂O₂) as the oxidizing agent. The samples underwent pre-treatment, controlled leaching for 6 hours at 75–85 °C, and complexometric titration with EDTA to quantify the extracted copper. The best results were obtained with H₂SO₄ at 1 mol/L, reaching copper concentrations of up to 118.14 g/L. The calibration curve showed high reliability (R² = 0.99), and statistical analysis (ANOVA and two-way ANOVA) confirmed reaction time as the most influential factor, explaining approximately 67% of the variation in the results. Visual changes in the solutions (beige, green, and blue) indicated possible interference from other metals. The results allowed the proposal of optimized operational parameters with greater efficiency, reduced reagent consumption, and lower environmental impact, contributing to practical and sustainable solutions for electronic waste recycling.