Institute of Earth Sciences, St. Petersburg State University (St. Petersburg, Russia)

Shamsutdinov M. D., Student, shamsutdinov.michail@yandex.ru
Petrov S. V., Associate Professor, PhD in Geology and Mineralogy, s.petrov@spbu.ru

PJSC Seligdar (Moscow, Russia).
Povarnicin P. A., Chief Technology Specialist, povarnicin_pa@seligdar.ru

This study investigates the potential use of feldspar from the Ryabinovoye gold deposit as a raw material for ceramic and glass manufacturing. Feldspars are crucial industrial minerals widely used in these sectors; however, the quality of feldspar feedstock significantly influences the performance and properties of the final products. The deposit’s ore is distinguished by a high potassium feldspar content accompanied by relatively elevated iron levels. Iron occurs in feldspar predominantly in two forms: microinclusions of iron-bearing minerals and isomorphic substitution within the feldspar crystal lattice. These forms were characterized using optical and electron microscopy, complemented by X-ray phase analysis. The microinclusions, ranging from 1 to 10 μm, consist mainly of pyrite, aegirine, and hematite, while the isomorphic iron content reaches up to 1.1 wt%. Although select samples meet state standards for feldspar raw materials used in glass production, the uneven distribution of iron and compositional heterogeneity present significant challenges for large-scale industrial utilization. This is due to the difficulty of removing iron impurities from feldspar, as well as the complexity of processing raw materials due to the heterogeneity of the mineral composition and iron inclusion size. Therefore, despite the inherent value of potassium feldspar from the Ryabinovoye deposit, current findings suggest it is not a viable candidate as a primary feldspar source for domestic ceramic and glass industries.

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