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STUDY OF THE TECHNOLOGY FOR OBTAINING A MIXTURE OF SILICOFLUORIDE AND SODIUM FLUORIDE FROM A BY-PRODUCT OF HYDROFLUORIC ACID PRODUCTION

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UDC: 661.48:66.011.014.06.08:54.03.05.06.08

 

Shokarimov S.M., Naimov N.A., Ruziev J.R., Rafiev R.S.

Aslonov A.A., Safiev H.

REVIEWER: Sherov M.,

Candidate of Chemical Sciences

Assistant Professor

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STUDY OF THE TECHNOLOGY FOR OBTAINING A MIXTURE OF SILICOFLUORIDE AND SODIUM FLUORIDE FROM A BY-PRODUCT OF HYDROFLUORIC ACID PRODUCTION

The article presents the results of research on the technology of processing and utilization of by-product of hydrofluoric acid production – a mixture of fluorosilicic and hydrofluoric acids using sodium hydroxide and sodium chloride (local mineral raw materials) to obtain fluoride salts – a mixture of silicofluoride and sodium fluoride. As a result of laboratory studies, the optimal parameters of the process of acid mixture processing using sodium hydroxide and sodium chloride to obtain a mixture of SSF and sodium fluoride were determined: temperature – 20-25 °C, duration – 10-20 min, concentration of sodium hydroxide and sodium chloride – 20-25%; in this case the maximum degree of extraction of SSF and sodium fluoride is achieved. The product obtained when sodium hydroxide was used under these optimum conditions was chemically analyzed and found to consist of 67.8% Na2SiF6 and 31.5% NaF. In the case of sodium chloride, the resulting mixture contains 95.8% of Na2SiF6 and 3.5% of NaF. To confirm the reliability of the results of chemical analysis and the found optimal parameters, as well as to determine the mineralogical composition of the obtained fluoride salts, X-ray phase analysis was carried out using an upgraded Dron-2 unit. The obtained product can be used in electrolysis production for obtaining aluminosilicon alloy (silumin) and electrolyte melt, as well as for fluoridation of drinking water and in the production of acid-resistant cements. On the basis of the conducted laboratory studies, the basic technological scheme of processing of the mixture of FSA and hydrofluoric acid with the use of sodium hydroxide and sodium chloride was developed.

Keywords: fluorosilicic acid, hydrofluoric acid, sodium hydroxide, sodium chloride, fluoride salts, sodium silicofluoride, sodium fluoride, utilization.

Information about the authors: Shokarimov Sirojiddin Mirzoevich – Tajik National University, Ph.D student of Department of inorganic substances. Address 734025, Republic of Tajikistan, Dushanbe, Rudaki Avenue, 17. Phone: (+992) 901-10-16-63. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.. 

Naimov Nosir Abdurahmonovich – Tajik National University, candidate of technical sciences, doctoral student of the Department of Applied Chemistry, Faculty of Chemistry, Address: 734025, Republic of Tajikistan, Dushanbe, Rudaki Avenue, 17. Phone: (+992) 901-11-65-12. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.. 

Ruziev Jura Rahimnazarovich – Tajik National University, Doctor of Technical Sciences, Prof., Professor of Applied Chemistry Department, Faculty of Chemistry. Address: 734025, Republic of Tajikistan, Dushanbe, Rudaki Avenue, 17. Phone: (+992) 917-36-15-13. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.. 

Rafiev Rustam Safaralievich – Tajik National University, Candidate of Chemical Sciences, Head of the Department of Applied Chemistry, Faculty of Chemistry. Address: 734025, Republic of Tajikistan, Dushanbe, Rudaki Avenue, 17. Phone: (+992) 939-06-69-59. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

Aslonov Azim Abdulhusaynovich – Tajik National University, Ph.D student of inorganic substances. Address: 734025, Republic of Tajikistan, Dushanbe, Rudaki Avenue, 17. Telephone: (+992) 935-32-97-97. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

Safiev Haidar – State Institution «Research Institute of Metallurgy» JSC «Tajik Aluminum Company», Doctor of Chemical Sciences, Professor, Academician of the National Academy of Sciences of Tajikistan.

 

Article  received   16.11.2023

Approved after review 19.03.2024

Accepted for publication 11.04.2024

   
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