Journals →  Tsvetnye Metally →  2021 →  #3 →  Back

ArticleName Flotation of Vostok-2 skarn scheelite sulphide ore with modifiers
DOI 10.17580/tsm.2021.03.04
ArticleAuthor Shepeta E. D., Ignatkina V. A., Samatova L. A., Korzh V. R.

Мining Institute of the Far Eastern Branch of the Russian Academy of Sciences, Khabarovsk, Russia:

E. D. Shepeta, Senior Researcher at the Comprehensive Mineral Processing Laboratory, Candidate of Technical Sciences, e-mail:
L. A. Samatova, Candidate of Technical Sciences, Docent, e-mail:

National University of Science and Technology MISiS, Moscow, Russia:

V. A. Ignatkina, Professor at the Department of Mineral Processing and Technogenic Raw Materials, Doctor of Technical Sciences, Docent, e-mail:

V. R. Korzh, Postgraduate Student at the Department of Mineral Processing and Technogenic Raw Materials, e-mail:


This paper describes the results of a study that looked at different reagent regimes of flotation of scheelite skarn ores with soda, sodium bicarbonate and sodium sulphide. According to published research data, these regimes of selective recovery scheelite from Skarn ores of Portuguese and Chinese deposits as an alternative to Petrov method. The results of studying the changes of the optical density of water glass in mixing with soda, sodium bicarbonate and sodium hydroxide at different temperatures are presented. Gelation of water glass is observed in a mixture of soda or sodium bicarbonate. The authors were studied the floatability of calcium minerals of scheelite sulphide ore by combined depressants (water glass and sodium sulphide), their dose (0–11.4 kg/t) and proportions (0.7 to 8), as well as the duration of conditioning at the Laboratory of Primorsky Concentrating Plant (PCP). In the course of research, it was established that a high dose of soda and sodium bicarbonate in the scheelite rougher flotation cycle determines a 2- to 6-times higher yield of rough scheelite concentrate with a 1.8-times lower WO3 enrichment ratio. A rise in the water dose to 1.4 kg/t in the rougher flotation cycle led to the recovery of scheelite falling to 30.4–41%, with the WO3 concentrate quality being 22.78–50.5%, corres pondingly. No commercial quality was reached when scheelite concentrate was subjected to heat treatment in a sodium sulphide (43–62 kg/t) and alkaline environment (рН 13) without water glass. Addition of 3.3 kg/t of water glass to sodium sulphide helped raise the quality of scheelite concentrate after three cleaner flotation to 54% WO3 and the recovery of scheelite was 68.4% only. A recovery of more than 82% of commercial grade scheelite concentrate (WO3 > 50%) was reached when running in standard mode using Petrov method of heat treatment. Application of the above processes, which demonstrated high performance in relation to scheelite ores taken from Skarn deposits of Portuguese and Chinese, to samples of Skarn scheelite sulphide ores from Far Eastern deposits, did not prove successful.
The authors would like to thank the Research Laboratory of PCP for support with lab studies.

keywords Flotation, scheelite sulphide ores, calcium minerals, reagent regimes, regulators, depress ants, heat treatment, floatability, contrast

1. Eygeles M. A. Fundamentals of non-sulphide ore flotation. Moscow : Nedra, 1964. 407 p.
2. Laskowski J., Ralston J. Colloid chemistry in mineral processing. Chapter 4. Dispersions stability and dispersing agents. New York : Elsevier, 1992. pp. 115–171.
3. Yao W., Li M., Zhang M., Cui R. et al. Effect of Zn2+ and its addition sequence on flotation separation of scheelite from calcite using water glass. Colloids and Surfaces A. 2020. Vol. 588. DOI: 10.1016/j.colsurfa.2019.124394.
4. Bo F., Xianping L., Jinging W., Pengcheng W. The flotation separation of scheelite from calcite using acidified sodium silicate as depressant. Minerals Engineering. 2015. Vol. 80. pp. 45–49. DOI: 10.1016/j.mineng.2015.06.017.
5. Kupka N., Rudolph M. Froth flotation of scheelite. A review. International Journal of Mining Science and Technology. 2018. Vol. 28, Iss. 3. pp. 373–384. DOI: 10.1016/j.ijmst.2017.12.001.
6. Wei Q., Dong L., Jiao F., Qin W. Use of citric acid and Fe (III) mixture as depressant in calcite flotation. Colloids and Surfaces A. 2019. Vol. 578. DOI: 10.1016/j.colsurfa.2019.123579.
7. Jiao X. W. F., Qin W., Yang C., Cui Y. et al. Sulfonated brown coal: A novel depressant for the selective flotation of scheelite from calcite. Colloids and Surfaces A. 2020. Vol. 602. DOI: 10.1016/j.colsurfa.2020.125006.
8. Yao W., Li M., Zhang M., Cui R. et al. Decoupling the effects of solid and liquid phases in a Pb-water glass mixture on the selective flotation separation of scheelite from calcite. Minerals Engineering. 2020. Vol. 154. DOI: 10.1016/j.mineng.2020.106423.
9. Sorokin M. M. Flotation. Modifiers. Physical basis. Moscow : MISiS, 2016. 372 p.
10. Ignatkina V. A., Shepeta E. D., Samatova L. A., Bocharov V. A. Increase in process characteristics of flotation of low-grade fine-disseminated scheelite ores. Russian Journal of Non-Ferrous Metals. 2019. Vol. 60, No. 6. pp. 609–616. DOI: 10.3103/S1067821219060063.
11. Ignatkina V. A., Shepeta E. D., Samatova L. A., Milovich F. O. Flotation of а sheelite-carbonate ore with wide range of carbonate module. 29 International Mineral Processing Congress — Moscow, 17–21 September, 2018 : Conference Proceeding. Canadian Institute of Mining, Metallurgy and Petroleum. pp. 1014–1025.
12. Shepeta E. D., Ignatkina V. A., Samatova L. A. Calcium minerals properties contrast increase in scheelite-carbonate ores flotation. Obogashchenie Rud. 2017. No. 3. pp. 41–48. DOI: 10.17580/or.2017.03.07.
13. Foucaud Y., Filippova I. V., Filippov L. O. Investigation of the depressants involved in the selective flotation of scheelite from apatite, fluorite, and calcium silicates: Focus on the sodium silicate/sodium carbonate system. Powder Technology. 2019. Vol. 352. pp. 501–512. DOI: 10.1016/j.powtec.2019.04.071.
14. Polkin S. I. Benefication of rare and noble metal ores and placers. Moscow : Nedra, 1987. 428 p.
15. Kang J., Liu Yu., Khoso S. Ah., Hu Yu. et al. Significant improvement in the scheelite heating flotation with sodium sulfide. Minerals. 2018. Vol. 8. p. 587. DOI: 10.3390/min8120587.
16. Foucaud Y., Filippova I., Dehaine Q., Hubert P. et al. Integrated approach for the processing of a complex tungsten Skarn ore (Tabuaco, Portugal). Minerals Engineering. 2019. Vol. 143. DOI: 10.1016/j.mineng.2019.105896.
17. Tamm M. E., Tretiakov Yu. D. Inorganic chemistry. The physical and chemical basis of inorganic chemistry. Book 1. Ed. by Yu. D. Tretiakov. Moscow : Akademiya, 2004. 240 p.

Language of full-text russian
Full content Buy