Abstract
Quality of raw materials, including quartz sand and quartzite, varies from one deposit to another. Furthermore, the material quality determines in which industrial branches it can be used after certain preparation processes. Potential applications of quartz raw materials are: in the construction and refractory industry, ceramics and glass industry, then in metallurgy, foundry and also in production of water treatment filters. Geological investigations of the central Serbia region, in the Rekovac municipality, resulted in identification of occurrence of quartz sand ("Ursula") and quartzite ("Velika Krusevica"). Preliminary laboratory tests and characterization of the quartz sand size fraction -0.63+0.1 mm confirmed the possibility of applying this size fraction in the construction materials industry, while the quartzite can be used in refractory, glass and metallurgy industries. After determining the geological reserve of quartz sand "Ursula" and quartzite "Velika Krusevica", detailed investigations are required. Quality conditions from the aspect of chemical composition and physical properties of quartz sand and quartzite are mostly clearly defined by a special standard for this purpose. On the other hand, there are also application areas where standards does not exist, but users define their quality conditions. This example is with the application of quartz sand in the production of water glass. Chemical composition as well is not always the determining factor for the application of quartz raw material. For example, for quartz sand used for sandblasting, grain form is essential. From the economic analysis point of view, the prices of quartz raw materials vary depending on their chemical and physical properties. After all, what needs to be pointed out is the fact that these raw materials are very widespread in nature and that their exploitation is quite simple. After the raw material is excavated, it is stored and further sieved, washed, dried and processed according to customer requirements. All of these processes are cheaper than preparing, for example, limestone, and significaly cheaper than preparation of metal ores.
Highlights
physical properties of quartz sand and quartzite are mostly clearly defined by a special standard for this purpose
This example is with the application of quartz sand
All of these processes are cheaper than preparing, for example, limestone, and significaly cheaper than preparation of metal ores
Summary
Kvarcni pesak „Ursule“ – Pre početka ispitivanja kvaliteta uzorak je prosejan na sitima otvora 0,63 mm i 0,1 mm, pri čemu su dobijene tri klase krupnoće: +0,63 mm (maseni udeo u polaznom uzorku je 44 %); -0,63+0,1 mm (maseni udeo je 42 %) i -0,1 mm (maseni udeo je 14 %). Imajući u vidu da se najčešće u pogledu krupnoće zahteva klasa -0,63+0,1 mm to je upravo na ovoj klasi urađena hemijska, mikroskopska i rendgenska analiza. Hemijska analiza je urađena na atomskom adsorpcionom spektrofotometru Analyst 300 („Perkin Elmer“, SAD). Mineraloška analiza urađena je na polarizacionom mikroskopu za odbijenu i propuštenu svetlost JEOL JSM–6610LV („JEOL“, Japan), binokularna lupa firme "Leitz Wetzlar". Skenirajuća elektronska mikroskopija (SEM) korišćena je za dobijanje mikrofotografija na uređaju JEOL JSM–6610LV („JEOL“, Japan).
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