Navoi State University of Mining and Technologies (Navoi, Republic of Uzbekistan)

Umirov F. E., Professor, Doctor of Engineering Sciences, umirov3@yandex.ru

Aripov A. R., Associate Professor, PhD in Engineering Sciences

Jizzakh Polytechnic Institute (Jizzakh, Republic of Uzbekistan)
Sabirov B. T., Professor, Doctor of Engineering Sciences, sabirovbahtiyor1970@gmail.com

Navoi Branch of the Academy of Sciences of the Republic of Uzbekistan (Navoi, Republic of Uzbekistan)
Ravshanova O. A., Basic Doctoral Student, ravshanovaoydinoy199@gmail.com

This study investigates vermiculite, an associated mineral of the Tebinbulak iron-magnetite deposit near Nukus, Republic of Karakalpakstan. The analytical methods included mass spectrometry, X-ray diffraction (XRD), thermogravimetric analysis (TGA), and infrared spectroscopy (IR). In addition to vermiculite, the ore was shown to contain biotite, annite, and phlogopite. Chemical analysis identified the dominant oxides as SiO₂ (40.3 wt.%), MgO (21.5 wt.%), Fe₂O₃ (11.3 wt.%), and Al₂O₃ (9.9 wt.%), with minor amounts of K₂O (3.6 wt.%) and Na₂O (0.9 wt.%). Structural analysis confirmed the presence of tetrahedral, octahedral, and interlayer phases typical of vermiculite. To assess beneficiation potential, the solubility of vermiculite in various aqueous acids and oxidizers was studied with the goal of isolating magnesium compounds for defoliant production. Solvents included HCl, H₂SO₄, NaClO, H₂O₂, and distilled water. Ore samples were crushed to < 45 μm using ShchD-6 jaw and IVS-4 vibratory crushers and classified with a Retsch AS 450 control sieve. Solubility, pH, and density were determined for the processed samples. The most efficient dissolution was observed at 25 °C using HCl, H₂O₂, and NaClO, particularly for the material below 45 µm. Acid leaching proved to be an effective method for producing magnesium-bearing solutions.

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10. Umirov F. E., Namozova G. R., Shodikulov Zh. M. Physicochemical properties and agrochemical effectiveness of new defoliants based on sodium, magnesium and calcium chlorates containing surfactants. Universum: Khimiya i Biologiya. 2021. No. 1. pp. 90–95.
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14. Umirov F. E., Shodikulov Zh. M., Aslonov A. B., Sharipov S. Sh. Material composition of talc-magnesite rocks of the Zinelbulak deposit in Uzbekistan. Obogashchenie Rud. 2023. No. 4. pp. 25–31.
15. Pat. 2356836 Russian Federation.
16. Pat. 2285666 Russian Federation.
17. Pat. 2038301 Russian Federation.
18. Pat. 2011638 Russian Federation.
19. Pat. 2128626 Russian Federation.
20. Pat. 2209780 Russian Federation.
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23. Umirov F. E, Fayzullaev N. I., Usanbayev N. Kh., Muzaffarov A. M., Umirov U. F., Pirnazarov F. G. Mineralogical and technological evaluation of saponites of the Uchtut residential place in the Republic of Uzbekistan. International Journal of Control and Automation. 2020. Vol. 13, No. 4. pp.230–236.
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