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ArticleName Technology of integrated use of borosilicates
DOI 10.17580/gzh.2021.08.08
ArticleAuthor Tagoev M. M., Nazarov Sh. B., Mirsaidov U. M.

Nikitin Institute of Chemistry, Tajik Academy of Sciences, Dushanbe, Republic of Tajikistan:

M. M. Tagoev, Post-Graduate Student
Sh. B. Nazarov, Head of Laboratory, Doctor of Chemical Sciences
U. M. Mirsaidov, Chief Researcher, Academician of the Tajik Academy of Sciences,


The article presents the studies into sulfuric acid-induced decomposition processes in cake after sodium sulfate treatment of raw material from Ak-Arkhar deposit. The influence of different physicochemical factors on recovery of various components from the cake during sulfuric acid-induced decomposition is examined, and the process of acid treatment is optimized. The physicochemical parameters are optimized for different process stages of sodium sulfate treatment of Ak-Arkhar borosilicates, namely:
— raw material and sodium sulfate sintering: temperature 900–950 °C; duration 40 min; ore/sodium sulfate mass ratio 1:2; initial borosilicate ore size 0.16 mm and smaller;
— water treatment of cake: temperature 90–100 °C; duration 60 min; ; liquid/solid mass ratio 8:1; cake size 0.1 mm and smaller;
— sulfuric acid-induced decomposition of solid residue after water treatment of cake: sulfuric acid concentration 15–20 %; temperature 95–100 °C; duration 60 min; liquid/solid mass ratio 6:1;
— separation of marketable products using organic dissolvers: ethyl alcohol mass 0.4 t; acetone mass 0.3 t; temperature 40 °C; duration 20–30 min. H3BO3 0.185 t goes to the organic phase.
The process flow diagram is developed for treatment of Tajik Ak-Arkhar borosilicate ore by the method of sintering with sodium sulfate. Such treatment ensures integrated processing of the material, with production of marketable products such as: boric acid, aluminum and iron sulfates (coagulants); potassium and sodium sulfates (for glass production); construction materials (calcium and magnesium sulfates).

keywords Processing, borosilicates, sodium sulfate, cake, sulfuric acid, differential thermal analysis

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