AP19677216 — Research and development of technologies, equipment for electrodialysis of solutions of tungstate, sodium sulfate with the regeneration of alkalis, acids

Purpose: Research and development of electrodialysis technology and equipment:

– sodium tungstate solutions with alkali regeneration and reduction of the consumption of inorganic acids and the amount of sulfate-chloride effluents;

– solutions of sodium sulfate with the regeneration of alkali and sulfuric acid.

Relevance: The relevance of the study is determined by the need for environmentally friendly and resource-efficient processing of tungsten-containing and polymetallic raw materials. Conventional purification methods of sodium tungstate solutions result in the formation of large volumes of acidic waste, increasing environmental impact. The application of membrane electrodialysis technologies eliminates the need for inorganic acids and significantly reduces waste generation. An additional advantage is the recovery of valuable components and regeneration of alkali from process solutions. The development of such approaches enhances the efficiency, sustainability, and economic performance of mineral processing technologies.

Scientific supervisor: Candidate of technical sciences, Assistant professor, Baimbetov Bolotpay

Results obtained:   Within the scope of the research work, electrodialysis units were designed and assembled, enabling experiments in both batch and continuous modes with process parameter control. Experimental studies on sodium sulfate solutions were carried out, and relationships between current density, concentration, operating time, conversion degree, and energy consumption were obtained. The processing of sodium tungstate solutions was investigated, leading to the production of tungstic acid and tungsten trioxide, along with identifying the patterns of pH variation and solution resistance during electrodialysis. Methods for monitoring solution composition, including density and pH measurements, as well as software tools for processing experimental data, were developed. Technological and equipment schemes were proposed, including solutions for acid and alkali regeneration within the process. The results demonstrate the effectiveness of electrodialysis for processing industrial solutions and provide a basis for further research, development, and industrial implementation.

List of publications with links to them

1. Баймбетов Б., Молдабаева Г., Елеулиева А., Жуманкулова С., Таймасова А., Адильжан З., Байсултанов Р., Якоб Е., Серикбаев В. Перспективы переработки вольфрамовых руд месторождения Акчатау // Processes. 2024. Т. 12. № 1. С. 77. DOI: https://doi.org/10.3390/pr12010077. – URL: https://www.mdpi.com/2227-9717/12/1/77.
2. Баймбетов Б., Тажиев Ю., Елеулиева А., Молдабаева Г., Даулетбакова А., Якоб Е., Таймасова А. Спекание с карбонатом натрия и выщелачивание вольфрамитовых кеков // Applied Sciences. 2024. Т. 14. № 24. С. 12031. DOI: https://doi.org/10.3390/app142412031. – URL: https://www.mdpi.com/2076-3417/14/24/12031.
3. Даулетбакова А.А., Баймбетов Б., Тажиев Ю., Молдабаева Г. Исследование электродиализа растворов вольфрамата натрия для получения вольфрамовой кислоты // Applied Sciences. 2025. Т. 15. № 13. С. 7033. DOI: https://doi.org/10.3390/app15137033. – URL: https://www.mdpi.com/2076-3417/15/13/7033.
4. Баймбетов Б.С., Мамяченков В.С., Даулетбакова А.А., Молдабаева Г.Ж., Тажиев Е.Б. Исследование мембранных процессов электродиализа растворов сульфата натрия с регенерацией щелочи и кислоты // Engineering Journal of Satbayev University. 2025. № 6. DOI: https://doi.org/10.51301/ejsu.2025.i6.01.