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PROCESSING AND COMPLEX USAGE OF MINERAL RAW MATERIALS
ArticleName Acceleration of dispersed gold leaching by photoelectrochemical activation of process solutions
DOI 10.17580/gzh.2015.08.15
ArticleAuthor Lavrov A. Yu.
ArticleAuthorData

Author:
Name & Surname: Lavrov A. Yu.
Company: Transbaikal State University (Chita, Russia)
Work Position: Dean, Faculty of Economics and Management
Scientific Degree: Candidate of Engineering Sciences
Contacts: lavrov_2012@mail.ru

Abstract

Besides the known forms of gold, reserves of which are being depleted, increasing emphasis is placed on micron, submicron and dispersed gold. Bulk of dispersed gold occurs between lattice points of minerals–concentrators. These can be either separate atoms or clusters of gold. In this case, gold recovery is possible through leaching of atoms making up the mineral. The active forms of oxygen, first and foremost, ozone, were proposed to be used to activate oxidation of sulfides containing gold by Corresponding Member of the USSR Academy of Sciences I. N. Plaksin as early as the 1940s. Somewhat afterwards, this area of research engaged scientists in America and Japan. In recent years, the similar studies are under way at the Moscow State University and the National University of Science and Technology. The most active forms of oxygen and their effect on oxidation were investigated by W. P. Van Antverp and Ph. A. Lincoln. The researchers found that oxidation is influenced not by ozone only but, to a great extent, by hydroxyl radical OHº (its redox potential reaches 2.3 V solely giving way to F). Treatment of water-air emulsion by ultra-violet creates active types of oxygen — O, O3, H2O2, OHº etc — inside bubbles with pure oxygen or bubbles with mix of gases (O2+ H2). A time-phased large-scale experiment was carried out in Aprelkovo Mine, NordGold, in April 2014 — April, 2015. The longest phase trial, with maximum feed of percolators with ore pelletized in active solutions, and with recirculation of leaching solutions showed that increment of recovery was 20.5% in the proposed process flow diagram as against the process chart currently in use in the Mine, and was higher by 7.5% than in the process flow diagram with peroxide used as an oxidizer. Photoelectrochemical activation of working solutions and liquid phase of ore pulp ensures, owing to highly active oxidizers being formed, considerable rise in recovery of dispersed gold from ore and mine waste using both heap and agitation leaching circuits. This allows recommending the proposed technology as early as the given stage of development for commercial introduction in gold mines in Transbaikalia and Russian Far East.

keywords Dispersed gold, recovery, photoelectochemical processes, leaching, pregnant solution, ore pulp, cyanidation
References

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