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Variation of mineralogy during the beneficiation of Capim kaolin from Pará, Brazil

Published online by Cambridge University Press:  09 July 2018

W. N. Mussel ,
E. Murad ,
P. S. R. Criscuolo ,
P. G. Pinheiro  and
J. D. Fabris
W. N. Mussel
Affiliation:
Departamento de Química-ICEx, Universidade Federal de Minas Gerais, Campus–Pamulha, 31270-901 Belo Horizonte, Minas Gerais, Brazil
E. Murad*
Affiliation:
Departamento de Química-ICEx, Universidade Federal de Minas Gerais, Campus–Pamulha, 31270-901 Belo Horizonte, Minas Gerais, Brazil Bayerisches Landesamt für Umwelt, Dienststelle Marktredwitz, D-95603 Marktredwitz, Germany
P. S. R. Criscuolo
Affiliation:
Centro de Desenvolvimento Mineral, Vale, 33030-970 Santa Luzia, Minas Gerais, Brazil
P. G. Pinheiro
Affiliation:
Departamento de Química-ICEx, Universidade Federal de Minas Gerais, Campus–Pamulha, 31270-901 Belo Horizonte, Minas Gerais, Brazil
J. D. Fabris
Affiliation:
Departamento de Química-ICEx, Universidade Federal de Minas Gerais, Campus–Pamulha, 31270-901 Belo Horizonte, Minas Gerais, Brazil
*
*E-mail: [email protected]
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Abstract

Kaolin mined from the Ipixuna deposit of Pará Pigmentos S.A. in the Capim river area of northern Brazil has been studied at various stages of beneficiation to determine the behaviour of Fe- and Ti-bearing minerals which can reduce the brightness of the product. X-ray diffraction and Mössbauer spectroscopy showed the principal pigmenting minerals to be hematite and goethite, with chemical analyses showing a distinct decrease of both the total Fe and Ti contents in the course of processing. The Ti contents were primarily reduced due to the removal of anatase during particle size fractionation and dithionite reduction. While the Fe content of the final product is structurally bound in kaolinite, Raman spectroscopy indicates the remnant Ti to be bound both structurally in kaolinite and in remnant anatase.

Keywords

Brazilkaolinhematitegoethiteanataseindustrial processingX-ray diffractionX-ray fluorescenceMössbauer spectroscopyinfrared spectroscopyRaman spectroscopy
Type
Research Article
Information
Clay Minerals , Volume 43 , Issue 3 , September 2008 , pp. 381 - 391
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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