RESEARCH ON THE EXTRACTION OF COPPER AND OTHER METALS FROM COPPER SLAGS USING SULFURIC ACID LEACHING
Keywords:
Copper slags, sulfuric acid, leaching process, metal recovery, H2SO4, silica (SiO2), energy efficiency, environmental safetyAbstract
This study explores the dissolution behavior of copper (Cu), iron (Fe), and zinc (Zn) from copper slags in sulfuric acid solutions under controlled experimental conditions. A series of experiments were performed to evaluate the effects of acid concentration (1,5 M, 2 M, and 2,5 M), temperature (70 °C, 80 °C, and 90 °C), and leaching duration (60, 90, and 120 minutes) on metal recovery efficiency. The findings demonstrated that a sulfuric acid concentration of 2,5 M, combined with a temperature of 90 °C and a leaching time of 120 minutes, yielded a copper recovery rate of up to 95% and an iron recovery rate of approximately 90 %. The study further established that higher acid concentrations and elevated temperatures significantly improve the efficiency of metal dissolution. In contrast, experiments conducted with lower acid concentrations (1,5 M and 2 M) showed a notable reduction in copper and iron recovery rates. Moreover, particle size reduction to below 100 microns was found to enhance the interaction between the acidic medium and metal oxides, leading to improved leaching efficiency. These results underline the critical influence of acid concentration, temperature, and reaction time as key parameters in optimizing the leaching process for metal recovery from slags.
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