Satbayev University, Almaty, Kazakhstan

Baimbetov B. S., Professor, Candidate of Engineering Sciences, Associate Professor
Moldabayeva G. Zh., Associate Professor, Candidate of Engineering Sciences, Associate Professor, gulnara.moldabayeva@satbayev.university
Taimassova A. N., Doctoral Student

Academician Melnikov Institute of Comprehensive Exploitation of Mineral Resources Russian Academy of Sciences – ICEMR RAS, Moscow, Russia
Kunilova I. V., Senior Researcher, Candidate of Engineering Sciences

The article focuses on the study of the processes intended for copper smelting slag processing, in order to extract such valuable components as copper, zinc, iron and silica. Various options for slag leaching with the use of sulfuric acid as one of the most promising approaches are considered. Preliminary thermodynamic calculations confirmed the high probability of dissolution of metal oxides when interacting with sulfuric acid. High-temperature leaching resulted in higher recovery rates for copper and other valuable metals. The use of sulfuric acid at the concentration of 50 g/dm3 in combination with the optimization of leaching parameters provided the high efficiency of valuable metal extraction—copper up to 76%, zinc up to 94% and iron in the form of oxide up to 92%. Acceleration of pulp filtering was achieved through two-stage re-pulping with hot water. The study results confirm the prospects of hydrometallurgical methods of slag processing. It opens up opportunities for the development of more efficient technologies for processing copper smelting waste, aimed at maximum extraction of useful components at minimal costs.

The study was supported the Committee of Science of the Ministry of Science and Higher Education of the Republic of Kazakhstan, Grant No. BR21881939.

1. Tarasov A. V., Zaitsev V. I. Recovery of valuable components from copper slag. Tsvetnaya Metallurgiya. 2011. No. 7-8. pp. 60–67.
2. Tian H., Guo Zh., Pan J. et al. Comprehensive review on metallurgical recycling and cleaning of copper slag. Resources, Conservation and Recycling. 2021. Vol. 168. ID 105366.
3. Roy S., Datta A., Rehani S. Flotation of copper sulphide from copper smelter slag using multiple collectors and their mixtures. International Journal of Mineral Processing. 2015.Vol. 143. pp. 43–49.
4. Svetlov A. V., Potapov S. S., Potapov D. S. et al. Investigation of possibility of recovery nonferrous metals and producing building materials from copper–nickel smelter slag. Vestnik MGTU. 2015. Vol. 18, No. 2. pp. 335–344.
5. Mamonov S. V., Gazaleeva G. I., Dresviankina T. P., Volkova S. V., Vasiliev I. D. Improvement of technological indices of copper smelters slags processing on the basis of their slow cooling and ultra-fine grinding. Izvestiya vysshikh uchebnykh zavedenii. Gornyi zhurnal. 2018. No. 2. pp. 83–90.
6. Gorlova O. E., Sinyanskaya O. M., Tusupbekova T. Sh., Kolodezhnaya E. V. Flotation of copper smelter slags intensified by impact crushing. Tsvetnye Metally. 2023. No. 1. pp. 7–16.
7. Uporova I. V., Penkov P. M., Bekchurina E. A. Processing of metallurgical slag. MIAB. 2024. No. 3. pp. 141–154.
8. Abdullin S. R. Organization of production for processing metallurgical slag of a copper smelter by flotation method. The Aspects of Science and Technology Innovations: XI International Conference Proceedings. Saratov :
NOO Tsifrovaya nauka, 2021. pp. 21–30.
9. Zhang J., Qi Y.-h, Yan D.-l, Cheng X.-l, He P. Characteristics and mechanism of reduction and smelting-separation process of copper slag. Journal of Iron and Steel Research International. 2015. Vol. 22. pp. 121–127.
10. Zhang H., Bao L., Chen Y., Xuan W., Yuan Y. Efficiency improvements of the CO-H₂ mixed gas utilization related to the molten copper slag reducing modification. Process Safety and Environmental Protection. 2021. Vol. 146. pp. 292–299.
11. Zhang B., Zhang T., Zheng C. Reduction kinetics of copper slag by H2. Minerals. 2022. Vol. 12, Iss. 5. ID 548.
12. Yakubov M. M., Dzhumaeva Kh. Yu., Umaraliev I. S., Mukhamedzhanova Sh. A. Understanding the possibility of using secondary raw materials when smelting copper sulphide concentrates in Almalyk MMC’s Vanyukov furnace. Tsvetnye Metally. 2023. No. 5. pp. 14–19.
13. Rudnik E., Burzynska L., Gumowska W. Hydrometallurgical recovery of copper and cobalt from reduction-roasted copper converter slag. Minerals Engineering. 2009. Vol. 22, Iss. 1. pp. 88–95.
14. Xia Z., Zhang X., Huang X. et al. Hydrometallurgical stepwise recovery of copper and zinc from smelting slag of waste brass in ammonium chloride solution. Hydrometallurgy. 2020. Vol. 197. ID 105475.
15. Bidari E., Aghazadeh V. Investigation of copper ammonia leaching from smelter slags: characterization, leaching and kinetics. Metallurgical and Materials Transactions B. 2015. Vol. 46. pp. 2305–2314.
16. Lutskiy D. S., Ignatovich A. S., Khismatullin R. R. Extraction of copper from solutions of ammonia leaching of copper melting production slags. Bulletin of the South Ural State University. Series: Metallurgy. 2021. Vol. 21, No 3. pp. 82–87.
17. Banza A. N., Gock E., Kongolo K. Base metals recovery from copper smelter slag by oxidising leaching and solvent extraction. Hydrometallurgy. 2002. Vol. 67, Iss. 1–3. pp. 63–69.
18. Urosevic D., Dimitrijević M. D., Jankovic Z. D. Recovery of copper from copper slag and copper slag flotation tailings by oxidative leaching. Physicochemical Problems of Mineral Processing. 2015. Vol. 51. pp. 73–82.
19. Altundogan H. S., Boyrazli M., Tumen F. A study on the sulphuric acid leaching of copper converter slag in the presence of dichromate. Minerals Engineering. 2004. Vol. 17, Iss. 3. pp. 465–467.
20. Kasikov A. G., Shchelkova E. A., Timoshchik O. A., Budnikova N. N. Method for processing metallurgical slag. Patent RF, No. 2765974 C1. Applied: 06.07.2021. Published: 07.02.2022. Bulletin No. 4.
21. Rtveladze V. V., Kosyakov A. I., Zakharov V. I. et al. Method of breakdown of dump copper–nickel scum. Author’s Certificate SU, No. 1171549A. Applied: 02.20.1984. Published: 07.08.1985. Bulletin No. 9.
22. Bogdanov V. A., Talanov A. A., Kiverin V. L. Method for processing coppercontaining slags. Patent RF, No. 2117059 C1. Applied: 25.03.1997. Published: 10.08.1998.
23. Baimetov B. S., Tazhiev E. B., Moldabayeva G. Zh., Dauletbakova A. A. To the problem of processing of waste slag from copper smelting plants in Kazakhstan. Mining Journal of Kazakhstan. 2024. No. 9. pp. 31–37.