Biossolubilização da calcopirita ('CU'FE'S IND. 2') na presença de íons cloreto
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Data
2013-07-04
Autores
Firmino, Stella Maris [UNESP]
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Universidade Estadual Paulista (Unesp)
Resumo
A recuperação de cobre a partir de calcopirita usando bactérias é o grande desafio da indústria mineradora atualmente. A biohidrometalurgia é um processo de exploração mineral bem estabelecido para a recuperação de cobre, no entanto não existe ainda um processo sendo aplicado comercialmente no mundo para a extração de cobre a partir de mineral calcopirítico. São inúmeras as alternativas que vem sendo estudada para o aumento da recuperação de cobre neste processo, a adição de cloreto é uma destas alternativas. No entanto, uma das limitações é a reconhecida inibição dos organismos acidofilicos em meio contendo cloreto. A principal bactéria envolvida neste processo é o Acidithiobacillus ferrooxidans. Esta espécie é acidofilica, mesofilica e obtém energia a partir da oxidação de íons ferrosos e compostos reduzidos de enxofre, incluindo os sulfetos metálicos, como por exemplo, calcopirita. Neste contexto, o objetivo deste trabalho foi estudar as linhagens da coleção do laboratório de Biohidrometalurgia na presença de íons cloreto. Para tanto as linhagens foram avaliadas quanto à capacidade de oxidarem Fe2+, enxofre elementar e calcopirita na presença de íons cloreto. Foi observada uma variação grande quanto à cinética de oxidação de íons ferrosos na presença de diferentes concentrações de cloreto. Uma ordem crescente de halotolerância foi proposta: S < SSP < V3 < LR < PCE < ATCC < SJ22 < CMV < PCEL < AMF. Quando enxofre foi utilizado como fonte de energia, todas as linhagens foram inibidas quando a produção de ácido, com exceção da linhagem PCEL. A capacidade de oxidação de calcopirita pelas linhagens também foi verificada através de ensaios respirométricos na presença de íons cloreto. Foi possível estabelecer uma ordem crescente de porcentagem de inibição das linhagens na...
Nowadays, the biggest challenge for mineral companies is recover copper from chalcopyrite. Biohydrometallurgy is a well-established mineral process for copper recovery, however there is no commercial process been applied for copper recovery from chalcopyrite ore. A number of alternatives have been studied; the addition of chloride is one of them. Nevertheless, one of the restrictions is the recognized chloride inhibition of acidophilic organisms. The main bacterium involved in this process is Acidithiobacillus ferrooxidans. This specie is acidophilic, mesophilic and obtains energy from oxidation of ferrous ions and reduced sulphur compounds, including metal sulphides, like chalcopyrite. This work studied the strains of Biohydrometallurgy laboratory’s collection in the presence of chloride ions. The strains were evaluated for their ability to oxidize ferrous ions, elemental sulphur and chalcopyrite in the presence of chloride ions. It was observed a wide discrepancy in the kinetics of ferrous ions oxidation in the presence of different chloride concentrations. A crescent order of halotolerance was proposed: S < SSP < V3 < LR < PCE < ATCC < SJ22 < CMV < PCEL < AMF. When sulphur was utilized as energy source, all strains were inhibiting regarding acid production, with exception for PCEL strain. The capacity of chalcopyrite oxidation was evaluated in respirometric assays in the presence of chloride ions. It was possible to establish a crescent order of percentage of inhibition in the presence of 50 mmol L-1 of chloride and chalcopyrite: (AMF ≈ LR ≈ V3) < ATCC < PCEL < SJ22 < S < SSP < CMV < PCE. The exception were the strains AMF, LR and V3, the others one presented some degree of inhibition. Copper recovery, pH, Eh, Fe2+ and Fe3+ were monitored in shake flasks experiments in two different sets: in the presence of 50 mmol L-1 and with successive... (Complete abstract click electronic access below)
Nowadays, the biggest challenge for mineral companies is recover copper from chalcopyrite. Biohydrometallurgy is a well-established mineral process for copper recovery, however there is no commercial process been applied for copper recovery from chalcopyrite ore. A number of alternatives have been studied; the addition of chloride is one of them. Nevertheless, one of the restrictions is the recognized chloride inhibition of acidophilic organisms. The main bacterium involved in this process is Acidithiobacillus ferrooxidans. This specie is acidophilic, mesophilic and obtains energy from oxidation of ferrous ions and reduced sulphur compounds, including metal sulphides, like chalcopyrite. This work studied the strains of Biohydrometallurgy laboratory’s collection in the presence of chloride ions. The strains were evaluated for their ability to oxidize ferrous ions, elemental sulphur and chalcopyrite in the presence of chloride ions. It was observed a wide discrepancy in the kinetics of ferrous ions oxidation in the presence of different chloride concentrations. A crescent order of halotolerance was proposed: S < SSP < V3 < LR < PCE < ATCC < SJ22 < CMV < PCEL < AMF. When sulphur was utilized as energy source, all strains were inhibiting regarding acid production, with exception for PCEL strain. The capacity of chalcopyrite oxidation was evaluated in respirometric assays in the presence of chloride ions. It was possible to establish a crescent order of percentage of inhibition in the presence of 50 mmol L-1 of chloride and chalcopyrite: (AMF ≈ LR ≈ V3) < ATCC < PCEL < SJ22 < S < SSP < CMV < PCE. The exception were the strains AMF, LR and V3, the others one presented some degree of inhibition. Copper recovery, pH, Eh, Fe2+ and Fe3+ were monitored in shake flasks experiments in two different sets: in the presence of 50 mmol L-1 and with successive... (Complete abstract click electronic access below)
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Biotecnologia, Lixiviação bacteriana, Microorganismos
Como citar
FIRMINO, Stella Maris. Biossolubilização da calcopirita ('CU'FE'S IND. 2') na presença de íons cloreto. 2013. 114 f. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Instituto de Química de Araraquara, 2013.