Growth of low-dimensional structure noble metals in carbonaceous materials under microwave treatment

Development of new and efficient technologies in the field of processing of noble metal-bearing ores is a topical task because of quality degradation of ore materials and due to involvement of refractory and double refractory ore into production, which makes extraction of noble metals from such ore ineffective. A promising trend of enhanced recovery of valuable components is high-energy deposition techniques, such as microwave treatment, which are advantageous for selective heating. The test subject of this study is carbonaceous sulfidic gold ore. In terms of the produced carbonaceous concentrates of flotation, the substantiation is provided for the possible growth of low-dimensional structure noble metals using microwave treatment with addition of magnetite to create active centers of local heating. It is shown that it is possible to grow noble metal particles to the sizes of 40–60 µm, which enables their recovery. The analysis of the effect exerted by microwave treatment on barren rocks in composition of flotation concentrates in terms of quartz and calcite disclosed an increase in the free surface energy of the test samples. The influence of microwave heating on pyrite particles is determined, the transition of iron sulfides to iron oxides owing to desulfurization is described. The particles of sulfidic metals can also become active centers of local heating during treatment and facilitate growth of noble metal particles.

Keywords: microwave treatment, carbonaceous raw material, refractory ore, flotation, lowdimensional structure gold, carbonaceous matter, noble metals, sulfidic minerals.
For citation:

Afanasova A. V., Aburova V. A. Growth of low-dimensional structure noble metals in carbonaceous materials under microwave treatment. MIAB. Mining Inf. Anal. Bull. 2024;(1):20-35. [In Russ]. DOI: 10.25018/0236_1493_2024_1_0_20.

Acknowledgements:

The study was supported by the Russian Science Foundation, Project No. 23-47-00109.

Issue number: 1
Year: 2024
Page number: 20-35
ISBN: 0236-1493
UDK: 622.7
DOI: 10.25018/0236_1493_2024_1_0_20
Article receipt date: 03.05.2023
Date of review receipt: 18.08.2023
Date of the editorial board′s decision on the article′s publishing: 10.12.2023
About authors:

A.V. Afanasova1, Cand. Sci. (Eng.), Assistant Professor, e-mail: Afanasova_av@pers.spmi.ru, ORCID ID: 0000-0002-8451-2489,
V.A. Aburova1, Graduate Student, e-mail: lera.aburova@mail.ru, ORCID ID: 0000-0002-1364-5006,
1 Empress Catherine II Saint-Petersburg Mining University, 199106, Saint-Petersburg, Russia.

 

For contacts:

A.V. Afanasova, e-mail: Afanasova_av@pers.spmi.ru.

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