Comparative experiments on the activation cyanide and chloride re-leaching of gold from the secondary mineral material of heaps of Aprelkovo mine

Maksim Kirilchuk,Adam Mustapha,I Rasskazov,S Tkach

doi:10.1051/e3sconf/202019202016

Abstract

This article presents the results of comparative experiments on the activation chloride and activation carbonate-cyanide leaching of gold from the secondary mineral material of heaps of Aprelkovo mine. A cyanide scheme with a gradual increase in the cyanide concentration in the pregnant solution was adopted as a control scheme for percolation leaching. To establish the maximum recovery of gold and associated components, preliminary experiments with agitational cyanide leaching were carried out. In the course of the experimental work, some of the problems of gold recovery according to the classical cyanide scheme applicable to this deposit were identified and, thanks to the use of activated solutions, were solved. The reasons for the insufficiently high recovery are clogging and limited access of the complexing agent to encapsulated and chemically bound gold inclusions due to their high dispersion in the crystal lattices of concentrating minerals and the presence in the ore of minerals that tend to absorb water with a pronounced hydration effect.

Highlights

At the moment, in connection with the depletion of reserves of -milling gold-bearing ores and placer sands containing precious metals, the extraction of useful components from refractory ores is quite in demand
The processes of extracting useful components from refractory ores by active chloride and cyanide solutions are being studied in depth
The results of laboratory experiments on re-leaching of gold by the activation leaching method show the effectiveness of these schemes, based on a high gold recovery in a fine fraction and an increased recovery in a coarse fraction compared to the cyanide scheme

Summary

Introduction

In connection with the depletion of reserves of -milling gold-bearing ores and placer sands containing precious metals, the extraction of useful components from refractory ores is quite in demand. Gold and other valuable metals from such ores cannot be recovered for one reason or another in conventional cyanide leaching, which is used in the mining industry, so new methods of leaching are being sought. The processes of extracting useful components from refractory ores by active chloride and cyanide solutions are being studied in depth

Methods

Results

Conclusion