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RESEARCH AND DEVELOPMENT OF TECHNOLOGY FOR PRODUCTION OF SODIUM FLUORIDE, AMORPHOUS SILICA AND LIQUID GLASS FROM A MIXTURE OF FLUOROSILICIC AND HYDROFLUORIC ACIDS

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UDC 661.48:66.011.014.082.091.3:661.683       https://doi.org/10.62965/tnu.sns.2024.1.13

 

Naimov N.A., Sattorov S.A., Mirsaidov U., Ruziev J.R., Aminjoni G., Safiev H.

Tajik National University

Сhemical, biological, radiological, and nuclear safety and security agency of NAST

 

In article presents the results of processing of a mixture of fluorosilicic and hydrofluoric acids – a by-product of fluoride salts and phosphate fertilizers production in order to obtain sodium fluoride, silica gel (amorphous silicon oxide) and liquid glass. On this basis, the optimal technological parameters of the interaction of a mixture of FSA and hydrofluoric acid with sodium hydroxide were determined depending on temperature, process duration and sodium hydroxide concentration.

It was found that at temperature 25 ºC, process duration 15 min, sodium hydroxide concentration 45% wt. the degree of sodium fluoride extraction reaches more than 93%. Also, sodium fluoride dissolved during the reaction after hydrolysis of sodium metasilicate with precipitation and filtration of silica gel is returned back to the production cycle for preparation of the required sodium hydroxide solution. It was determined that treatment of amorphous silica forming with 10 % sodium hydroxide solution for 60 min. and temperature 85-90 ºC yields liquid glass. The results of the conducted research are confirmed by chemical and X-ray phase analyses, which gives grounds for the introduction of this technology in the industry. In addition, on the basis of the conducted researches the basic technological scheme of processing of the mixture of FSA and hydrofluoric acid was developed in order to obtain sodium fluoride, amorphous silica and liquid glass.

 

Keywords: sodium fluoride, amorphous silica, fluorosilicic acid, hydrofluoric acid, sodium hydroxide, liquid glass, sodium metasilicate.

 

Information about the authors

 

Naimov Nosir Abdurahmonovich-Tajik National University,

candidate of technical sciences, doctoral student of the Department of Applied Chemistry.

Address: 734025, Dushanbe, Republic of Tajikistan, 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.. 

 

Sattorov Subhonali Abdugafforovich – Сhemical, biological, radiological, and nuclear safety and security agency of NAST,

Ph.D student in chemical technology of inorganic substances.

Address: 734025, Dushanbe, Republic of Tajikistan, 33 Rudaki Ave.

Phone: (+992) 300-03-97-76.

E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

 

Mirsaidov Ulmas – Сhemical, biological, radiological, and nuclear safety and security agency of NAST,

Doctor of Chemical Sciences, Professor, Academician, Consultant, Head Researcher.

Address: 734025, Dushanbe, Republic of Tajikistan, 33 Rudaki Ave.

Phone: (+992) 37 2258005.

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, Professor, Professor of Applied Chemistry Department.

Address: 734025, Dushanbe, Republic of Tajikistan, 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..

 

Aminjoni Giyosiddin–State Institution «Scientific Research Institute of Metallurgy» JSC «Tajik Aluminium Company»,

Candidate of Technical Sciences, Head of Laboratory of processing of local alumina and carbon-containing raw materials.

Address: 734003, Dushanbe, Republic of Tajikistan, 17, H. Hakimzoda str.

Phone: (+992) 909-15-15-07.

Е-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

 

REVIEWER: Samikhov Sh.R.,  Doctor of Technical Sciences,  Professor

 

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Article received: 16.11.2023

Approved after review: 08.01.2024

Accepted for publication: 26.02.2024

 

   
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