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Minerals 2017, 7(5), 70;

An Alternative Source for Ceramics and Glass Raw Materials: Augen-Gneiss

Mineral Processing Engineering Department, Mining Faculty, Maslak, Istanbul Technical University, 34469 Istanbul, Turkey
Author to whom correspondence should be addressed.
Academic Editor: William Skinner
Received: 10 April 2017 / Revised: 26 April 2017 / Accepted: 4 May 2017 / Published: 15 May 2017
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Due to the depletion of well-known feldspar reserves in the forms of granite, trachyte and pegmatite, many investigations are focused on new and economic alternatives to these resources. Of these, gneiss is a metamorphic rock type, which is characterized by dark and light colored minerals including feldspar and quartz. In this study, Augen-Gneiss rock was subjected to flotation tests to produce alkali (Na + Ca) feldspar and quartz concentrates by adapting different flotation conditions with/without hydrofluoric acid (HF). During these tests, the effect of particle size and different reagent combinations were investigated. The results of these tests showed that, in the presence of HF, a saleable feldspar concentrate with 0.04% Fe2O3 content and a saleable quartz concentrate with 98.45% SiO2 content were obtained. Products with similar qualities to a feldspar concentrate with 0.13% Fe2O3 and a quartz concentrate with 92.53% SiO2 content were produced without HF. The results of these tests clearly showed that, compared to other types of origin, saleable quality feldspar and quartz could well be enriched with/without HF from Augen-Gneiss rock. View Full-Text
Keywords: Augen-Gneiss; feldspar; quartz; flotation Augen-Gneiss; feldspar; quartz; flotation

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Kangal, M.O.; Bulut, G.; Yeşilyurt, Z.; Güven, O.; Burat, F. An Alternative Source for Ceramics and Glass Raw Materials: Augen-Gneiss. Minerals 2017, 7, 70.

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