CRUZ, V. C. A.; http://lattes.cnpq.br/1376665790048099; CRUZ, Valério Carlos de Almeida.
Résumé:
The Bentonitic clay is widely used in many areas of the industry, such as drilling mud
for petroleum and water perforations, steel industries, pelotization of iron ore,
chemical and pharmaceutical industry, among others. Paraiba concentrates about
60% of the national reserves, the raw Bentonite produced in 1999 represented 90%
of the brazilian production and the benefited one 94,2%. In the processing segment,
where beyond the simple benefaction of desintegration, homogenation and drying,
the ativation is carried out, by the addition of sodium carbonate transforming the
bentonite of calcic nature to sodic. The Bentonites of Boa Vista PB, form small
deposits distributed in a distance of 10 km. The country rocks are the basaltic flow
of the Tertiary in the east and the granites and gneisses of the Pre-Cambrian in the
west. The Bentonite is characterized by the predominance of clay minerals smectite,
ilite and kaolinite. In this research samples of Bentonites of the Boa Vista region of
various colors such as white, green, chocolate, bofe, red, yellow were analyzed with
the objective of identifying and characterizing the chemical composition and
mineralogy of the clay classified based on colors. The methodology used in this work
included collection of samples from the bentonite processing companies and from the
deposits, chemical composition analysis, analysis and interpretation of the data
based on the colors of the bentonite. There is a perfect correlation between the
colors and the chemical and mineralogical camposition of the bentonite. The
technical properties of the clay depends on the composition and mineralogy.
Classification of the bentonite based on colors for industrial uses and treatment is
valid because in this work it was noted that the chemical and mineralogical
composition of the clay tend to be different in function of the colors found in the
bentonite deposits of the Boa Vista region.
