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

Química Nova

Fernanda Arruda Nogueira Gomes Da Silva²  Francisco Manoel Dos Santos Garrido²  Marta Eloísa Medeiros²  João Alves Sampaio¹  Adão Benvindo Da Luz¹  Lívia Da Silva Mello¹  Flávio Teixeira Da Silva¹ 

[1] ,Universidade Federal do Rio de Janeiro Instituto de Química Departamento de Química InorgânicaRio de Janeiro RJ ,Brasil

关键词: kaolin;    chemical bleaching;    brightness;   

DOI  :  10.1590/S0100-40422011000200017

来源: SciELO

【 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】

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