ESTUDO TERMODINÂMICO DA RECUPERAÇÃO DE COBRE UTILIZANDO RESINA QUELANTE PARA DIFERENTES ESTADOS DE OXIDAÇÃO DO FERRO
THERMODYNAMIC STUDY OF COPPER RECOVERY USING CHELATING RESIN FOR DIFFERENTS IRON OXYDATION STATES
Amilton Barbosa Botelho Junior, Jorge Alberto Soares Tenório
Resumo
Um dos maiores problemas na recuperação de metais a partir do minério laterítico de níquel é a presença de Fe(III), em concentrações superiores a 55%, o que prejudica técnicas de separação no processo hidrometalúrgico. Estudos cinéticos mostram que, a recuperação de metais é maior para o ferro presente na solução no estado de oxidação +2 do que para ferro no estado de oxidação +3. Contudo, estudos termodinâmicos para avaliar o efeito do estado de oxidação do ferro no processo de separação são pouco explorados na literatura. Desta forma, o presente trabalho teve por objetivo estudar a termodinâmica no processo de recuperação de cobre utilizando a técnica de troca-iônica utilizando resina quelante. O efeito da temperatura foi avaliado entre 25°C e 60°C. As amostras foram analisadas através de espectroscopia de raios-X. Resultados mostram que a recuperação do cobre foi maior para solução com presença de Fe(II), e que a temperatura diminuiu a eficiência de recuperação de cobre.
Palavras-chave
Abstract
The main problem of metals recovery from nickel laterite ore is the presence of Fe(III), in concentrations higher than 55%, which harms separation techniques in hydrometallurgical process. Kinetics studies shows that metals recovery is higher when iron is present in solution in oxidation state +2 than iron in oxidation state +3. However, thermodynamics studies to evaluate the effect of iron oxidation state in separation process is little explored in the literature. Therefore, the aim of this work is to study thermodynamics in the recovery process of copper using ion exchange technique by chelating resin. The effect of temperature was studied between 25°C and 60°C, and samples were analyzed in X-ray spectroscopy. Results shows that copper recovery was higher for solution with Fe(II), and temperature decreased the recovery copper effectiveness.
Keywords
Referências
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