| ArticleName |
Process mineralogy
of Karelian high-silica sedimentary rocks — a nonconventional source of quartzfeldspathic
mineral material |
| Abstract |
Quartz and feldspars are industrial minerals, currently distinguished by growing demand with continuous shortage, compensated by import. Import substitution being a necessity, search for new domestic sources of quartz-feldspathic mineral materials, including nonconventional, is of current concern. In the Central Karelian region, widely occur alumino-siliceous sedimentary rocks, exposed to multiple regional metamorphism and recrystallization. As a consequence, the Elmuss area rocks formation is characterized by a mineral composition with 86–98 % quartz and feldspars content. Mineralogical, structural-petrographic studies of silicites were performed using standard optical-mineralogical methods, X-ray diffraction studies, as well as with up-to-date scanning electronic microscope VEGA II LSH and microanalyzer INCA ENERGY 350. Chemical composition was determined by the solution chemistry method and XFS spectrometer ARL ADVАNT’Х-2331. With respect to alkaline metals’ oxides (K2O + Na2O) content and potassium modulus, the studied silicites meet the production requirements to feldspar products, but with regard to Fе2О3 need beneficiation. By magnetic analysis of narrow size fractions it was established, that quartz-feldspathic concentrates grade is determined by quantity and size of difficultly liberated micron-size inclusions of muscovite, partial liberation of which begins with 0.25 mm size fraction. The laboratory studies showed that by means of magnetic separation of silicite ground to 0.25 mm size and dedusted by 0.063 mm size fraction, it is possible to produce quartz-feldspathic concentrate with mass fraction of Fе2О3 below 0.2 %. |
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