Produção Nacional
O FELDSPATO INDUSTRIAL DE CORONEL MURTA, MG E A PERSPECTIVA DE APLICAÇÕES À INDÚSTRIA CERÂMICA E VIDREIRA
2006; Sociedade Brasileira de Geologia; Volume: 36; Issue: 1 Linguagem: Inglês
10.25249/0375-7536.200636s1200206
ISSN2177-4382
AutoresSÉRGIO TÚLIO DE PINHO-TAVARES, Cristiane Castañeda, Antônio Carlos Pedrosa‐Soares,
Tópico(s)Iron oxide chemistry and applications
ResumoMineralogical and technological evaluations of K-feldspar were accomplished from 21 pegmatites bodies, which are derived from type S granites of G4 Suite (520-500Ma), Coronel Murta, Minas Gerais. The pegmatites are characterized by using 13 items including data of deposits, geology, up to environmental aspects and exploration conditions. The results of the ceramic tests showed that 71 of the 72 samples subjected to the botom test were considered as the firstquality for the ceramic industry, while the tile test approved nine of the twelve samples.The powdered samples with mica and kaolin showed relatively low contents of silica (Si0 2 17%). The kaolin displays yellow ishandreddish pink colorations to the pulverized feldspar. The systematic sampling at the internal zone of the Agua Santa pegmatite, the main producer of feldspar from Coronel Murta; showed that this mineralis richer in Si0 2 , Na 2 O and Na 2 O+K 2 O at the southeast portion of the pegmatite, while the north west part of the body presents feldspar with higher contents of Al 2 O 3 and Fe 2 O 3 . Simultaneously, the values of SiO 2 , Al 2 O 3 and Fe 2 O 3 indicate that the southeast portion of this pegmatite is more suitable for the production of glass type B, while the intermediate zone can be used for ceramic of first quality. On the basis of the positive evaluation of alI samples by botom test, this paper presents new chemical specifications for the K-feldspar from Coronel Murta, that are (in weight-%): Si0 2 ≤67; TiO 2 17,0; Fe 2 O 3 ≤0,15; MgO≤0,3; CaO≤0,3; Na 2 O 2,0-3,5; K 2 O≥12,0; on ignition loss <0,7; Nap+Kp2':14,0.
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