Desenvolvimento e avaliação de um metodo semi-continuo de fusão zonal e sua aplicação na recuperação de indio / Development and evaluation of a semi-continuous zone melting method and its application on indium recovery

AUTOR(ES)
DATA DE PUBLICAÇÃO

1997

RESUMO

The zone refining process consists of the movement of one or more melted zones along the bar of the material which purification is desired. This purification process presents as variables: solidification rate, thermal gradient in front of the solid/liquid interface, convection imposed to the liquid and relative size of melted zone. The present work aims to introduce a solution to the problem of low production rate of the purification methods based on the solidification theory. Firstly, the proposed method was investigated by using numerical simulation. In addition, in order to evaluate the performance of this new version of the zone melt technique. an experimental apparatus was examined by the processing of a SnPb alloy. Atomic absorption spectroscopy was used to determine the chemical composition of the samples. Finally, this purification method was used to purify indium, which was characterized by using atomic emission spectrometry analysis. The results obtained show that the method described in this work has better performance than regular zone refining methods

ASSUNTO(S)

solidificação directional solidification fusão por zona metais - purificação purification zone melting

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