Journals →  Eurasian Mining →  2021 →  #1 →  Back

ArticleName Features of material constitution of quartz–feldspar ore from Quang Nam deposit in Vietnam
DOI 10.17580/em.2021.01.10
ArticleAuthor Yushina T. I., Nguyen Thu Thuy, Dumov А. М., Nguyen Van Trong

National University of Science and Technolgy – NUST MISIS, Moscow, Russia:

Yushina T. I., Head of Department, Associate Professor, Candidate of Engineering Sciences,
Nguyen Thu Thuy, Post-Graduate Student
Dumov А. М., Associate Professor, Candidate of Engineering Sciences
Nguyen Van Trong, Probationer


Feldspar is the largest group of aluminosilicate minerals making around 50% of the lithosphere mass. Feldspar is a high-value raw materials used in various industries in production of glass, ceramics, electrical insulators, abrasives, as well as an aggregate in production of plastics, paints, rubber, etc. A major source of high-grade feldspar is granitic pegmatites. The Social Republic of Vietnam possesses considerable feldspar reserves but mostly in weathered and semi-weathered pegmatite zones, which governs the complex material constitution of feldspar material and the diverse lattice architecture of feldspar weathering products. The article describes the integrated studies into the material constitution of quartz–feldspar ore from Quang Nam deposit in Vietnam. It is found that the ore has a rather complex composition. Alongside with the base useful component – feldspar represented by orthoclase and albite, the ore contains free quartz, mica group minerals (muscovite) and iron-bearing minerals as inclusions and coats in feldspar. The iron mineral coats are observed on the surface of muscovite grains. The mass percentage of Al2O3 is on average 14.20%; Fe2O3 – 0.75%; SiO2 – 75.27%. The total percentage of alkali metal oxides (K2O+Na2O) is similar in different size grades and makes on average 8.64%. The yield and distribution of useful component y size grades are relatively uniform. The analysis of the research findings allows drawing the conclusion that most efficient method to remove impurities of mafic minerals, including iron minerals, and free quartz is flotation. The feldspar ore flotation flow chart should include four stages: desliming (removal of clayey minerals); flotation of mina group minerals; flotation of iron-bearing minerals; flotation of feldspar. The proposed ore pretreatment circuit with selective milling and desliming enables production of mica concentrate with the size of +2 mm. The studies into material constitution of Quang Nam quartz–feldspar ore prove that this ore is processable toward production of valued products in high demand in many industries.

keywords Feldspar, quartz, pegmatites, mica, mineralogy and petrography analysis, X-ray phase analysis, grain size composition, flotation, selective milling

1. Eremin N. I. Nonmetal minerals. Moscow : MGU, 1991.
2. Russian Geological Encyclopedia. 3 volumes. Moscow–Saint-Petersburg : VSEGEI, 2011. Vol. 2. 704 p.
3. Sun G., Wang M., Guo J., Wang Y., Yang Y. Geochemical Significance of Clay Minerals and Elements in Paleogene Sandstones in the Center of the Northern Margin of the Qaidam Basin, China. Minerals. 2020. Vol. 10(6). pp. 505.
4. Zhang Y., Hu Y., Sun N., Liu R., Wang Z., Wang L., Sun W. Systematic review of feldspar beneficiation and its comprehensive application. Minerals Engineering. 2018. Vol. 128. pp. 141–152.
5. Ghalayini Z. T. Feldspar and nepheline syenite. Minerals Yearbook–2017. U. S. Geological Survey, 2020. 24 p.
6. Bates R. L. Geology of the Industrial Rocks and Minerals. New York : Dover Publications, 1969. 459 p.
7. Pegmatitic textures, Pittsburg, Department of Geology & Planetary. Science School of Arts and Sciences University of Pittsburgh, 2008
8. McLean A. C. Geologi untuk jurutera awam. Universiti Teknologi Malaysia, Skudai, 1998.
9. Bandini P., Prestidge C.A., Ralston J. Colloidal Iron Oxide Slime Coatings and Galena Particle Flotation. Minerals Engineering. 2001. Vol. 14(5). pp. 487–497.
10. Deer W. A., Howie R. A., Zussman, J. Rock-Forming Minerals. Vol. 4B. Framework Silicates: Silica Minerals. Feldspathoids and the Zeolites. 2nd ed. London Bath : Geological Society, 2004. 982 p.
11. Gwalani L. G., Dalal V. P., Fernandez S. S., Mulai B. P., Parveen S. et al. Granitic pegmatites of koradi-kolar sector, Ngapur District, Central India: Field of petrographic and mineralogical features. Revista Brasileira de Geociências. 1999. Vol. 29(1). pp. 99–104.
12. Mineral Commodity Summaries. 2020. Available at: (accessed: 15.06.2021).
13. Nguyen Van Hanh et al. Research on feldspar processing technology of Mo Ngot, Phu Tho. Mineral Processing and Utilization Science and Technology Center, Vietnam Mineral Association for Mineral Processing. 2006.
14. Hacifazlioglu H., Kursun I., Terzi M. Beneficiation of low-grade feldspar ore using cyclojet flotation cell, conventonal cell and magnetc separator. Physicochemical Problems of Mineral Processing. 2012. Vol. 48(2). pp. 381–392.
15. Glgnl I., Karagzel C. M., elik M. S. Surface vs. Bulk analyses of various feldspars and their significance to flotation. International Journal of Mineral Processing. 2008. Vol. 86, Iss. 1–4. pp. 68–74.
16. Vidyadhar A., Rao K. H., Forssberg K. S. E. Adsorption of n-tallow 1,3 propanediamine-dioleate collector on albite and quartz minerals and selective flotation of albite from Greek Stefania feldspar ore. Journal of Colloid and Interface Science. 2002. Vol. 248(1). pp. 19–29.
17. Vidyadhar A., Rao Hanumantha K. Adsorption mechanism of mixed cationic/anionic collectors in feldspar-quartz flotation system. Journal of Colloid and Interface Science. 2007. Vol. 306, Iss. 2. pp. 195–204.
18. El-Dine W. N., El-Shershaby A., Afifi S., Sroor A., Samir E. Natural radioactivity and rare earth elements in feldspar samples, Central Eastern desert, Egypt. Applied Radiation and Isotopes. 2011. Vol. 69, Iss. 5. pp. 803–807.
19. Yu Y., Ma L., Cao M., Liu Q. Slime coatings in froth flotation: A review. Minerals Engineering. 2017. Vol. 114. pp. 26–36.

Full content Features of material constitution of quartz–feldspar ore from Quang Nam deposit in Vietnam