Assessment of refractory gold-bearing ores based of interpretation of thermal analysis data

METALLURGY AND MINERAL PROCESSING

Tatyana Aleksandrova, Doctor of Engineering Sciences, Professor, Saint-Petersburg Mining University Russian Federation;

Heide Gerhard, Doctor, Professor, Freiberg Mining Academy, Germany;

Anastassiya Afanasova, Postgraduate Student, Saint-Petersburg Mining University Russian Federation.

Abstract

The article presents the results of a study on the possibility to assess refractory gold-bearing ores using thermal analysis data. It studies the flotation concentrates obtained during the enrichment of double refractory sulfide gold-bearing ores. This type of ore is complicated by the fine impregnation of gold in sulphide minerals and the presence of sorption-active scattered carbonaceous matter, which is in close association with sulphides. The results of thermogravimetric and mass spectrometric studies of refractory gold-bearing ores are presented.

The obtained fragments for kerogen CH (m/z = 15), C2H (m/z = 29) and C3H (m/z = 43) indicate the presence of various types of carbonaceous matter in the studied samples. It is justified that the degree of sorption activity of carbonaceous matter depends on the presence of kerogen and bitumen in the ore. High sorption activity of scattered carbonaceous material significantly affects the processing technology of ores and concentrates, both flotation and pyro- and hydrometallurgical methods.

Thermogravimetric and mass spectroscopic analyzes can be used to determine the degree of preg-robbing of refractory gold-bearing ores. The obtained results predetermine the direction of creating new methods and technologies in the field of decarburization of refractory gold-bearing ores in the integrated development of solid minerals in the mining regions of Russia.

Keywords: black slates; pyrolysis; kerogen; bitumen; gold ore; sulphides; high sorption activity; carbon matter

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Publications:

1. Aleksandrova T. N., Shabarov A. N., Key issues for improving of carbonaceous ore beneficiation processes for the extraction of valuable components / XVIII International Coal Preparation Congress: 28 June-01 July 2016 Saint-Petersburg, Russia, № 1, 2016. С 1179 - 1183.
2. Andronov G. P., Zakharova I. B., Filimonova N. M., Lvov V. V., Aleksandrova T. N., Magnetic separation of eudialyte ore under pulp pulsation / JOURNAL OF MINING SCIENCE, № 52, Т 6, 2016. С 1190 - 1194.
3. Aleksandrova T. N., Lvov V. V., THE USE OF HIGH-GRADIENT MAGNETIC SEPARATION TO INCREASE THE EFFICIENCY OF EXTRACTION OF MAGNETIC FRACTION FROM COAL COMBUSTION WASTE / ENERGY AND CLEAN TECHNOLOGIES CONFERENCE PROCEEDINGS, SGEM 2016, VOL II, № 2, Т 1, 2016. С 165 - 170.
4. Aleksandrova T. N., Nikolaeva N. V., Aleksandrov A. V., Romashev A. O., Noble and rare metals in caustobioliths and prospects of their recovery / Journal of Mining Science, № 51, Т 6, 2016. С 1254 - 1261.
5. Aleksandrova T. N., Shabarov A. N., Nikolaeva N. V., To the question of complex use of ashes and slag waste CHP plant / XVIII International Coal Preparation Congress: 28 June-01 July 2016 Saint-Petersburg, Russia, № 1, 2016. С 603 - 607.

Scientifiс periodical «Zapiski Gornogo Instituta / Journal of Mining Institute» has been published since 1907 as a periodical scientific and scientific-educational edition in Saint-Petersburg Mining University. The periodicity of publishing is 6 volumes per year.