2024-10-242024-10-242018-02-23NASCIMENTO, Dryelle de Nazaré Oliveira do. Biolixiviação para a extração limpa do minério de cobre proveniente da região de Carajás-PA. Orientador: Hélio Raymundo Ferreira Filho. 2018. 78 f. Dissertação (Mestrado em Ciências Ambientais) - Centro de Ciências Naturais e Tecnologia, Universidade do Estado do Pará, Belém, 2018.https://portaldaposgraduacao.uepa.br/handle/riuepa/236Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESAbertoMineração - ParáLixiviação bacteriana - Pará. 3.Minérios de cobre – ParáMinérios de cobre - ParáAcidithiobacillus ferrooxidansCalcopiritaLixiviação bacterianaMineraçãoChalcopyriteBacterial leachingMiningDissertaçãoEngenharias::Engenharia de MinasChalcopyrite is the copper ore with the greatest presence in the earth's crust, and the most used for commercial extraction of copper. In Brazil, the main copper reserves are located in Pará, specifically at Carajás Region. Traditional extraction of this metal are performed with pyrometallurgical processes (use of high temperatures for physico-chemical transformations in minerals), which demand high amounts of energy, water and chemical reagents. An alternative to reduce feedstocks and waste generation is the bioleaching process, which consists of metal extraction through the iron/sulfur oxidizing bacteria activity. The bioleaching is a process with relatively low installation and operation costs, and might be an alternative to copper ore exploration on Pará, contributing to the conservation of natural resources in Amazon.The work aimed at the use of Acidithiobacillus ferrooxidans bacterium for the bioleaching, in columns and reactors, of samples of mineral sulfides and weathered copper ores from the region of Carajás-PA. For this proposal, a laboratory-scale prototype was developed at ISI-TM.Samples mineralogical and chemical characterization were performed by X-ray Diffraction (XRD) and Energy Dispersive X-ray Fluorescence (EDXRF), respectively, and pH, redox potential (Eh), copper extraction and bacterial enumeration were monitored along the experiments. The first bioleaching reactor test was conduct for 100 days, resulting in copper extraction rates of 0.74% and 18.35% from the mineral sulfide and weathered copper ores, respectively. The second bioleaching reaction test was conducted by 47 days, also applying mineral sulfide and weathered copper ores samples, but employing a lower pulp density and a temperature control, when compared with the fist assay. The obtained copper extraction rate from the mineral sulfide was four times higher (1.67%) than the one obtained in the first experiment, whereas the weathered sample extraction (19.54%) was similar. Column bioleaching assays using A. ferrooxidans resulted in copper extraction rates of 1.07% in the column containing the 2.00 mm particles size ore and 0.95% for the one containing the 4.75 mm particle size ore. The highest copper extraction rates from samples of the Carajás Region were obtained by the bioleaching of weathered ore samples in reactors, indicating this method as the main alternative for extraction of copper from marginal and low-grade copper ores.PPGCA - Estudos de ecossistemas amazônicos