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ArticleName Behaviour of the gold dispersed drops in the ore on being heated
DOI 10.17580/nfm.2016.02.01
ArticleAuthor Amdur A. M., Fedorov S. A., Matushkina A. N., Apakashev R. A.

The Ural State Mining University, Ekaterinburg, Russia:

A. M. Amdur, Head of the Chemistry Department, e-mail:
S. A. Fedorov, Student, e-mail:
A. N. Matushkina, Post Graduate Student, e-mail:
R. A. Apakashev, Professor of the Chemistry Department, e-mail:


Considerable part of the world's reserves of gold is accumulated in refractory ores, which contain a dispersed gold as inclusions in sulphides and silicates. The dispersed gold extraction from refractory ores and anthropogenic objects by well-known ore-dressing methods requires a preliminary enlargement of gold parts. Here the purpose is to analyze processes leading to a dispersed gold coarsening in the course of ore heating. The object of investigation is silicate-carbonate gold-bearing ore. Gold in the ore is associated with pyrite and arsenopyrite and is also contained in quartz and hard iron minerals. It cannot be extracted by cyanidation. It is experimentally determined that dispersed drops of the molten gold move towards ore surface through pores under the action of thermocapillary pressure on being heated by external heat source. After the enclosing rock melting, drops of gold are floated by gas bubbles. A condition of the drops of gold flotation in oxide melt has been analyzed. It is noted that drops of gold coagulate in the process of flotation. As a result, gold concentrates on the oxide melt surface. At the same time, the gold particles enlargement up to the sizes permissive to extract the given metal by gravity methods takes place. Method of thin gold extraction, including material heating, melting, grinding after cooling and enrichment by gravity method with the use of a KNELSON centrifugal concentrator has been realized in laboratory conditions. This has allowed to increase the yield from 13% for an initial material to 33% after its thermal treatment, especially on narrowing the size grades of particles and on separate enrichment of the close-cut fractions. In the latter case the most part of gold is extracted by cyanidation.

The work was performed within the framework of the project part of the Ministry of Science and Education of the Russian Federation state order.

keywords Dispersed gold, drops, porous bodies, interfacial tension, capillary pressure, flotation, heating

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Full content Behaviour of the gold dispersed drops in the ore on being heated