Korovin V.Yu., Pohorielov Yu.M., Shestak Yu.G., Valiaiev O.M. Impact of the fluoride ion and sulfuric acid content in leaching solution on the granite weight decrease

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Parent Category: Geo-Technical Mechanics, 2022

Category: Geo-Technical Mechanics, 2022, Issue 160

Geoteh. meh. 2022, 160, 141-151

https://doi.org/10.15407/geotm2022.160.141

 

IMPACT OF THE FLUORIDE ION AND SULFURIC ACID CONTENT IN LEACHING SOLUTION ON THE GRANITE WEIGHT DECREASE

¹Korovin V.Yu., ²Pohorielov Yu.M.,¹Shestak Yu.G., ¹Valiaiev O.M.

¹Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine, ²Dniprovsky State Technical University 

UDC 66-926: 546.161

Language: English

Abstract: The paper presents the results of the study regarding the impact of the initial concentrations of fluoride ion and sulfuric acid in a leaching solution on the weight decrease of granite mined at Pridniprovsk Specialized Quarry. Decrease of the weight of granite samples were measured using an analytical balance after the sample treatment with the above reagents with subsequent filtration, rinsing and drying of the treated samples at a temperature of 105 °С until constant weight. Fluoride ion concentration was measured with a fluorine-selective electrode relatively the saturated silver chloride half-cell, solution acidity was measured by titrimetry. Weight decrease was studied for a granite sample, grain fraction 2.0 + 1.0mm, in batch mode depending upon the sulfuric acid concentration in the range 18.8 g/dm³ to 76.6 g/dm³ and exposure time 7, 14, and 21 days. It was found that sulfuric acid solution resulted in the decrease of granite weight by 1.65 % to 3.18 % depending upon acid concentration and exposure time. The study was carried out regarding the impact of fluoride ion concentration on the granite sample weight decrease depending on the fluoride ion concentration 3.25×10^-2 g/dm³ to 5.00×10^-1 g/dm³ as well as sulfuric acid concentration within the range 18.8  g/dm³ to 76.6 g/dm³ and exposure time 7, 14, and 21 days. It was found that the impact of fluoride ion on the sample weight decrease was extremal at the sulfuric acid concentration in the range 18.8 g/dm³ to 37.7 g/dm³ with maximum values within the concentration range 0.3 g/dm³ to 0.5 g/dm³. Weight decrease became higher pro rata the fluoride ion concentration at the sulfuric acid concentration 76.6 g/dm³. The data were presented regarding the change of fluoride ion content depending upon exposure time, concentration of fluoride ion and sulfuric acid. The change in fluoride ion concentration ambiguously depended on the exposure time, initial concentration of fluoride ion and sulfuric acid and even resulted in its increase, which was probably due to the dissolution of fluoride-containing minerals (mica, fluorite, etc.) in the samples.
Keywords: granite, ammonium bifluoride, sulfuric acid, weight decrease, fluoride ion.

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About authors:

Korovin Vadym Yuriiovych, Ph.D. (Chem.), Head of Laboratory of New Technologies for Raw and Industrial Waste Processing, Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Pohorielov Yurii Mykolaiovych, Senior Researcher at Sorbent Scientific and Pedagogic Center, Dniprovsk State Technical University (DGTU), Kamianske, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Shestak Yurii Hryhorovych,Senior Engineerin  Laboratory of New Technologies for Raw and Industrial Waste Processing, Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

Valiaiev Oleksandr Mykhailovych, Engineer in Laboratory of New Technologies for Raw and Industrial Waste Processing, Department of Elastomeric Component Mechanics in Mining Machines, Institute of Geotechnical Mechanics named by N. Poljakov of National Academy of Sciences of Ukraine (IGTM NAS of Ukraine), Dnipro, Ukraine, This email address is being protected from spambots. You need JavaScript enabled to view it.

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