Flotation of dispersed gold drops in melts as an element of technological scheme of enrichment

A significant part of gold reserves is represented by microand nanodispersed particles in natural deposits and in technogenic formations. In order to extract microdispersed gold particles by existing enrichment methods, they must be enlarged. This is possible in the process of heating and melting the material by flotation. As a result, the flotation of gold drops in the melts becomes an element of the enrichment scheme. It includes grinding the materials and enrichment by gravity methods after it has cooled. Usually flotation is analyzed as one of the technologies for mineral processing. But it is based on the complex and insufficiently studied physicochemical phenomenon of swimming bodies of higher density than that of a liquid on its surface under the influence of interfacial tension forces. Therefore, flotation refers not only to solid, but also to liquid substances. The conditions and mechanism of the flotation of gold and sulfide drops in oxide melts are analyzed. It was found that the flotation of gold drops in melts leads to their significant enlargement and proceeds at rather high rates. The process of passing a gas bubble through the interphase boundary of two immiscible liquids is considered using the example of a matte-slag system and the conditions for a matte drop to float together with a bubble. The scale of solving these problems is determined by the fact that they expand the idea of flotation of drops in melts as a stage of mineral processing in which valuable components are in a dispersed state.

Keywords: gold, flotation, drop, oxide melt, interfacial tension, matte, slag, gas bubble.
For citation:

Amdur A.M., Pavlov V.V., Fedorov S.A. Flotation of dispersed gold drops in melts as an element of technological scheme of enrichment. MIAB. Mining Inf. Anal. Bull. 2020;(31):399-409. [In Russ]. DOI: 10.25018/0236-1493-2020-31-0-399-409.


the work was supported by RFBR grants № 18-29-24081 \ 19 and № 19-3890080\19.

Issue number: 3
Year: 2020
Page number: 399-409
ISBN: 0236-1493
UDK: 622.78+544.77
DOI: 10.25018/0236-1493-2020-31-0-399-409
Article receipt date: 21.11.2019
Date of review receipt: 31.01.2020
Date of the editorial board′s decision on the article′s publishing: 20.03.2020
About authors:

Amdur A.А.1, Head of the chemistry department Ural State Mining University, Dr. Sci. (Eng.), e-mail: engineer-ektb@rambler.ru,
Pavlov V.V.1, Professor of the chemistry department Ural State Mining University, Dr. Sci. (Сhemistry),
Fedorov S.A.2, postgraduate student of the 3th course and a junior researcher, e-mail: saf13d@mail.ru,
1 Ural State Mining University, 620144, Ekaterinburg, Kuibyshev St., 30, Ruusia,
2 Institute of Metallurgy, Ural Branch, Rassian Academy of Science, 620016, Ekaterinburg, Amundsen St., 101, Russia.


For contacts:

1. Osovetsky B.M. Prirodnoe nanozoloto: monografiya [Natural nanogold: monograph], Perm, Perm State National Research Institute, 2013, 176 p. [In Russ]

2. Shadrunova I., Gorlova O., Orekhova N., Zilina V. Gold from gold extraction plant tailings. International Journal of Applied Engineering Research. 2018, Vol. 13, no 8, pp. 6340—6347.

3. Baybatina A.B., Dyusembaeva K. Sh., Sazhin Yu. G., Abdykirova G. Zh. Mikroi nanozoloto i tekhnologiya ego izvlecheniya [Micro and nanogold and technology for its extraction], Almaty, Asyl kitap, 2009, 160 p. [In Russ]

4. Leonenko N.A. Lazernoe agregirovanie mikroi nano chastic zolota iz vysokoglinistogo mineral’nogo syr’ya rossypnyh mestorozhdenij [Laser aggregation of microand nanoparticles of gold from high-clay mineral raw materials of placer deposits], Rossy-pi i mestorozhdeniya kor vyvetrivaniya: sovremennye problemy issledova-niya i osvoeniya. 2010, pp. 371–374. [In Russ]

5. Matushkina A.N., Amdur A.M., Tsypin E.F. Indicators of material enrichment with the predominance of finely dispersed gold before and after heat treatment using carbonatesilicate ore as an example. Gornyi Zhurnal. 2016, no 12, pp. 9—13. [In Russ]

6. Yang Tianzu, Xie Boyi, Liu Weifeng, Zhang Duchao, Chen Lin. Enrichment of Gold in Antimony Matte by Direct Smelting of Refractory Gold Concentrate. JOM: J. Miner., Metals and Mater. Soc. 2018, Vol. 70, no 6, pp. 1017—1023.

7. Abramov A.A. Flotacionnye metody obogashcheniya: Uchebnik [Flotation methods of enrichment: Textbook], Moscow, Mountain Book, 2016, 595 p. [In Russ]

8. Vanyukov A.V., Zaitsev V. Ya. Shlaki i shtejny cvetnoj metallurgii [Slags and mattes of non-ferrous metallurgy], Moscow, Metallurgy, 1969, 408 p. [In Russ]

9. Sazonova V.F., Kozhemyak M.K. The flotation mechanism of finely emulsified fatty acids. Bisnik Odes’kogo nacional’nogo universitetu. Himiya. 2011, Vol. 16, no 13—14 (39— 40), pp. 47—53. [In Russ]

10. Dudek M., Øye G. Microfluidic Study on the Attachment of Crude Oil Droplets to Gas Bubbles. Energy and Fuels. 2018, Vol. 32, Issue 10, рр. 10513—10521.

11. Mungall, J.E., Brenan J.M., Godel B., Barnes S.J., Gaillard F. Transport of metals and sulphur in magmas by flotation of sulphide melt on vapour bubbles. Nature Geoscience. 2015, Vol. 8, Issue 3, рр. 216—219.

12. Vatolin N.A., Amdur A.M., Fedorov S.A., Matushkina A.N. Motion of Dispersed Gold Droplets in Porous Bodies and Oxide Melts during Heating. Doklady Chemistry. 2015, Vol. 465, Part 1, pp. 265—267.

13. Pavlov V.V. Krizis klassicheskoj kineticheskoj teorii: nauchnaya monografiya [The crisis of the classical kinetic theory: a scientific monograph], Yekaterinburg, URSMU, 2017, 423 p. [In Russ]

14. Chashechkin Yu. D., Prokhorov V. Ye. Detachment of a single drop of water. Doklady akademii nauk. 2014, Vol. 454, no 1, pp. 31–36. [In Russ]

15. Geguzin Y.E. Puzyri [Bubbles], Moscow, Nauka, 1985, 176 p. [In Russ]

Подписка на рассылку

Раз в месяц Вы будете получать информацию о новом номере журнала, новых книгах издательства, а также о конференциях, форумах и других профессиональных мероприятиях.