NUST “MISiS”, Moscow, Russia:

Tarasov V. P., Doctor of Engineering Sciences, Professor, Head of the Department for Non-Ferrous Metals and Gold, Director of the Center for Industrial Technology Engineering (CIPT), e-mail: vptar@misis.ru
Gorelikov E. S., Deputy Director of CIPT, e-mail: gorelikoves@misis.ru
Zykova A. V., Post-graduate Student of the Department for Non-Ferrous Metals and Gold, e-mail: anna_zykova@inbox.ru
Petrunin K. O., Post-graduate Student of the Department for Non-Ferrous Metals and Gold

A review of the scientific and technical literature on hydrometallurgical methods for extracting highpurity vanadium oxide from spent catalysts in the petrochemical industry has been carried out. Currently, high-purity vanadium oxide (V₂O₅ ≥ 99.5%) is not produced in Russia. The main consumer of high-purity vanadium oxide is the rapidly developing production of vanadium-containing master alloys for the manufacture of titanium alloys. In the chemical industry, high-purity vanadium oxide is used to produce catalysts for the synthesis of phthalic and maleic anhydrides. One of the promising sources of vanadium is spent (deactivated) vanadium catalysts (SVC), in which the content of the valuable component in terms of pentoxide (V₂O₅) can reach 4–8%. It is much higher than in most processed ore raw materials. Spent catalysts are a secondary raw material, since during operation there is a loss of catalytic properties (activity, conversion, selectivity). After several cycles of regeneration, such a product is a subject of recycling to obtain valuable components. It should also be noted that there is an increase in demand for hydrotreating catalysts, which may cause an excess of spent catalysts in the future. In this regard, there is an urgent need to develop a highly efficient technology for processing catalysts in order to extract valuable components. The review of the scientific and technical literature shows that there are many methods for processing spent catalysts. The article describes the methods of acid, alkali, soda leaching, as well as the performance indicators of these processes. But the existing scientific developments in this area need further development in order to improve the efficiency of the vanadium oxide leaching process.

1. Vanadium: Poperties and Applications. Metotekhnika, 2018. 28 p. Available at: https://www.metotech.ru/articles/art_vanadiy_2.pdf. (Accessed: 15.06.2022)
2. Peng H. A Literature Review on Leaching and Recovery of Vanadium. Journal of Environmental Chemical Engineering. 2019. Vol. 7, Iss. 5. 103313. DOI: 10.1016/j.jece.2019.103313
3. Russian Market of Catalysts for the Oil Refining Industry. Available at: https://rupec.ru/download.php?url=/upload/iblock/rupec-catalyze2021.pdf (Accessed: 15.06.2022)
4. Mazurek K. Recovery of Vanadium, Potassium and Iron from a Spent Vanadium Catalyst by Oxalic Acid Solution Leaching, Precipitation and Ion Exchange Processes. Hydrometallurgy. 2013. Vol. 134-135. pp. 26–31.
5. Kasikov А. G. Utilization and Complex Processing of Products and Wastes of Gas Cleaning of Copper-Nickel Production. Apatity, FITs KNTs RAN, 2019. 198 p.
6. Shubina M. V., Makhotkina E. S. Investigation of Leaching Condition Influence on the Degree of Vanadium Extraction from Metallurgical Slags. Teoria i tecnologia metallurgiceskogo proizvodstva. 2019. Vol. 31, No. 4. pp. 13–17.
7. Bezrukov I. Ya. Method of Processing Spent Vanadium Catalysts from Sulfuric Acid Production. Patent RF, No. 2155638. Applied: 30.08.1999. Published: 10.09.2000. 7 p.
8. Orekhova S. E. Method of Processing Spent Vanadium Catalysts from Sulfuric Acid Production. Patent Republic of Belarus, 17007. Applied: 02.06.2011. Published: 28.02.2013. 3 p.
9. Kozlov V. A. Method of Vanadium-Bearing Raw Material Processing. Patent RF, No. 2374344. Applied: 24.05.2007. Published: 27.11.2009. Bulletin No. 33. 7 p.

10. Romanovskaia Е., Romanovski V., Kwapinski W., Kurilo I. Selective Recovery of Vanadium Pentoxide from Spent Catalysts of Sulfuric Acid Production: Sustainable Approach. Hydrometallurgy. 2021. Vol. 200. 105568. DOI: 10.1016/j.hydromet.2021.105568
11. Radchenko S.L., Radchenko Yu. S., Orekhova S E. Production of Glazes Based on Spent Vanadium Catalysts. Production wastes. 2009. Vol. 66. pp. 144–146.
12. Mazurek K., Grzesiak P., Druzynski S., Kielkowska U., Wróbel A., Szalla A. Method of Utilization of the Spent Vanadium Catalyst. Polish Journal of Chemical Technology. 2018. Vol. 20, Iss. 3. pp. 1–7.
13. Mazurek К. Extraction of Vanadium and Potassium Compounds from the Spent Vanadium Catalyst from the Metallurgical Plant. Polish Journal of Chemical Technology. 2012. Vol. 14., Iss. 2. pp. 49–53.
14. Cao Y., Yuan J., Du H., Dreisinger D., Li M. A Clean and Efficient Approach for Recovery of Vanadium and Tungsten from Spent SCR Catalyst. Minerals Engineering. 2021. Vol. 165. 106857. DOI: 10.1016/j.mineng.2021.106857
15. Wu L., Dai C., Wang H., Wang J., Dong Y. Leaching of Vanadium, Potassium, and Iron from Spent Catalyst of the Manufacture of Sulfuric Acid. Journal of Materials Research and Technology. 2021. Vol. 11. pp. 905–913.
16. Nana L., Xinyang X., Yuan L. Recovery of Vanadium and Tungsten from Spent Selective Catalytic Reduction Catalyst by Alkaline Pressure Leaching. Physicochemical Problems of Mineral Processing. 2020. Vol. 56, Iss. 3. pp. 407–420.
17. Choi I., Moon G., Lee J., Jyothi R. K. Extraction of Tungsten and Vanadium from Spent Selective Catalytic Reduction Catalyst for Stationary Application by Pressure Leaching Process. Journal of Cleaner Production. Vol. 197. pp. 163–169.
18. Wang H., Feng Y., Li Hailong, Li Haoran, Wu H. Recovery of Vanadium from Acid Leaching Solutions of Spent oil Hydrotreating Catalyst Using Solvent Extraction with D2EHPA (P204). Hydrometallurgy. Vol. 195. 105404. DOI: 10.1016/j.hydromet.2020.105404