Processes and velocity of dissolution of Permian-age sylvinite in the Ural region

The article points at the need to analyze processes and velocity of dissolution of Permian-age sylvinite in the Ural region. The procedures of the sample preparation and lab-scale tests on dissolution velocities in water and in sodium chloride solution at different temperatures and under different conditions are described. The data on chemical compositions of various sylvinite samples, dissolution velocities and material constitution of water-insoluble residue are presented. The aim of the research was to analyze the processes and velocities of the Ural sylvinite dissolution in water and in sodium chloride solution at the temperatures of 20 and 500 °C in the modes of free and induced convection. The research tasks were to determine compositions of salt and minerals, to analyze texture and structure, and to estimate influence exerted by water-insoluble impurities and gas microinclusions on the velocity and course of dissolution. The methods involved were: petrographic analysis of texture and structure of sylvinite; gravimetriс determination of dissolution velocity and density of samples; picnometer method to find densities of brines; atomic emission spectroscopy of chemistry of initial samples and solutions (brines); quantitative X-ray phase analysis of mineral composition of water-insoluble residue. The dissolution velocities prove suitability of Permian-age sylvinite for extraction by in-situ dissolution in the Ural region.

Shakirov T. R., Vafina M. S., Nazharova L. N. Processes and velocity of dissolution of Permian-age sylvinite in the Ural region. MIAB. Mining Inf. Anal. Bull. 2021;(11):146-158. [In Russ]. DOI: 10.25018/0236_1493_2021_11_0_146.

T.R. Shakirov^1,2, Graduate Student, Junior Researcher,
M.S. Vafina^1,2, Graduate Student, Leading Process Engineer,
L.N. Nazharova², Cand. Sci. (Eng.), Assistant Professor,
¹ JSC «Central Scientific Research Institute of Geology Nonmetallic Mineral Resources» (JSC «CSRIgeolnerud»), 420097, Kazan, Republic of Tatarstan, Russia,
² Kazan National Research Technological University, 420015, Kazan, Republic of Tatarstan, Russia.

T.R. Shakirov, M.S. Vafina, e-mail: vak33andrei@yandex.ru.

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