Separation of the Cd and Ni from Ni-Cd battery by green method utilizing aqueous two-phase system / Separação de Cd e Ni presentes em bateria de Ni-Cd por um método ambientalmente seguro utilizando sistema aquoso bifásico

AUTOR(ES)

Vânia Gonçalves Lacerda

DATA DE PUBLICAÇÃO

2009

RESUMO

This work, was done a revision of what has been done in the area of recycling of Ni-Cd batteries, since the disposal of these materials is regulated in several countries, including Brazil, through the resolution CONAMA no 257, because the potential polluter. The recycling is a solution to the disposal of exhausted Ni-Cd batteries, which can not be done with the household waste. One of the techniques used in the stage of separation of metals present in these batteries is the solvent extraction. It was developed in this work a hydrometallurgical process for separation of metals Cd and Ni from Ni-Cd batteries using aqueous two-phase system, ATPS, in the stage of separation of metals. The separation of Cd and Ni was performed in ATPS formed by copolymer L35, lithium sulfate and water. The influence of the amount of extractant added (potassium iodide) in ATPS, tie line length (TLL), mass ratio between the phases of the ATPS, leaching and the dilution factor of battery samples was investigated. A maximum extraction of Cd (99.2 3.1 %) and Ni (10.6 0.4%) was obtained when the batteries were leached with HCl and the parameters TLL, concentration of KI, mass ratio of the phases and the dilution factor of the battery sample were equal to 62.53% (m/m), 50.00 mmol kg-1, 0,5 and 35, respectively. The proposed method proved to be efficient to separate the metals in question and also has the advantage of being environmentally safe, as the ATPS used are made of a biodegradable copolymer and consisted mostly of water. This new method is strategic and green chemistry approach, because do not use organic solvent and it is recyclable.

ASSUNTO(S)

cádmio níquel sistema aquoso bifásico liquid-liquid extraction nickel bateria de ni-cd aqueous two-phase system cadmium quimica analitica potassium iodide extração líquido- líquido ni-cd battery iodeto de potássio

Documentos Relacionados

• Separation of Fungal Propagules by Partition in Aqueous Polymer Two-Phase Systems
• Two-phase aqueous micellar systems: an alternative method for protein purification
• A rapid method for the isolation of circular DNA using an aqueous two-phase partition system.
• Ascaris lumbricoides: alteration of the erythrocyte superficial charge using the Partition Method in aqueous two-phase system
• Separation of organic dust from microorganism suspensions by partitioning in aqueous polymer two-phase systems.