Caracterização petrográfica, química e tecnológica dos quartzitos do centro produtor de São Thomé das Letras no sudoeste do Estado de Minas Gerais
2002; Linguagem: Inglês
ISSN
2639-6459
Autores Tópico(s)Chemistry Education and Research
ResumoThe productive center of Sao Thome das Letras there are two tests areas, called area I (Sao Thome das Letras) and area II (Luminarias). In these areas were selected six different types of quartzites (White, Yellow, Pink, Carrancas, Carranquinha and Luminarias). With the purpose of a better and value way to use these rocks in exterior and interior construction work, it was necessary a nice study of geological and technological caracterization. The petrographic studies found out significant diferences in their mineral and texture composition, specially related in their quartzites quantity, muscovite and dull minerals. The MEV analyses, total chemical and mineral of the rock, they confirm that the variety of colors from the quartzites researched, are determined from dull minerals alterations and variation of quantity of the iron and titanium in the muscovite. The structural research made in area I, in Sao Thome das Letras, and area II, Luminarias region, define respectively four and five main families of cutting fracture rocky structure, giving spacious areas differently and heterogeneous between families. In the areas where fracture is very intense, occur a low recuperation tax in the grub, around 10 to 15%, resulting a high quantity of reject components. The technological quality of the quartzites studied, inclue many physic analisys, mechanics and chemicals. The results of physics degree when compared with specifics limits from ASTM C 616 89 norms (> 95% de SiO2 and Ab < 1,0%), shows satisfactory results. The flexibility resistence results agree about the quality of ornamental rocks for revestments. The chemical attack resistence of the variety tested, showed good results to the acids used. The results of stain resistence were very satisfactory, observing from the most analisys some stain presence. Key-Words: Quartzites, Technological, Ornamental, Physical and
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