Alvejamento químico de caulins Brasileiros: efeito do potencial eletroquímico da polpa e do ajuste do pH

Alvejamento químico de caulins Brasileiros: efeito do potencial eletroquímico da polpa e do ajuste do pH

Samples of Kaolin from different regions in Brazil were characterized by XRD, SEM and chemical analysis. A chemical bleaching study with pH adjustment was accomplished with the fractions below 37 μm, after classification by screening. The main objective was to evaluate the conditions of chemical bleaching that most increase the brightness of these kaolin's samples. Increases between 2.63 and 2.98% in the brightness (ISO) were observed after the chemical bleaching. We could say that the reduction of Fe3+ to Fe2+ during the chemical bleaching promoted an increase in the brightness, based on the Pourbaix Diagrams.

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Bibliographic Details
Main Authors: Silva,Fernanda Arruda Nogueira Gomes da, Garrido,Francisco Manoel dos Santos, Medeiros,Marta Eloísa, Sampaio,João Alves, Luz,Adão Benvindo da, Mello,Lívia da Silva, Silva,Flávio Teixeira da
Format: Digital revista
Language:Portuguese
Published: Sociedade Brasileira de Química 2011
Online Access:http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422011000200017
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