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

Química Nova

Adão Benvindo da Luz¹  João Alves Sampaio¹  Francisco Manoel dos Santos Garrido²  Lívia da Silva Mello²  Fernanda Arruda Nogueira Gomes da Silva²  Marta Eloísa Medeiros²  Flávio Teixeira da Silva² 

[1] Centro de Tecnologia Mineral;Universidade Federal do Rio de Janeiro;

关键词: kaolin;    chemical bleaching;    brightness;   

DOI  :  10.1590/S0100-40422011000200017

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown