| Annotation |
The processing of alluvial deposits is an economically viable and environmentally responsible solution,
making it an important task for the mining industry and the regions where gold is mined. The object of the research
is gold-bearing alluvial deposits with a significant content of boulders and the sandy part of long-term
technogenic waste obtained from mobile washing devices during enrichment. The goal is to experimentally
study the operation of an industrial device while optimizing individual technological units and the technology of
gold leaching from stale waste of small fractions (sand-clay fraction in pebble and ephal dump). Research objectives
are as follows: 1) testing the technology in semi-industrial conditions of gravity enrichment of gold-bearing
sands; 2) testing the technology of gold leaching from technogenic waste of industrial device washing with
cyanide substitutes in laboratory conditions. AAnalyst and QUANT atomic absorption spectrometers with the
assay method are used to study gold-bearing placers and their wastes to increase reliability. Sulfide minerals
were identified using an optical microscope MBS-9 and chemical reagents. Granulometric analysis gas been
performed using a laser analyzer. Semi-industrial tests of a modified mobile modular washing unit have been
conducted, and the optimal technological parameters for gold extraction during mechanical and hydro-elevator
loading of sands are determined. As part of the comprehensive testing of flotation equipment modifications, a
detailed assessment of the impact of key classifier parameters on the efficiency of gold extraction has been
made. In particular, the following parameters are studied: the gap between the spiral and the base of the classifier,
the speed of the spiral rotation, the angle of the spiral, and the ratio of liquid and solid phases during
both the primary and secondary liquefaction stages. In addition, the performance of the initial sands and the
performance at the stage of the secondary liquefaction are analyzed. The new device increases the efficiency
of the development of boulder-type placer deposits, increasing the productivity of the equipment, the degree
of gold recovery, and reducing the cost of production. The loss of very fine and thin gold has been reduced
by 50 %, and the overall recovery rate of the metal has increased by 7 %. The research has been conducted
on the technology of gold leaching from stale waste of small fractions: sand-clay fraction in pebble and ephal
dump. The gold recovery rate is 85.5 %. |
| Key words |
gold, placer deposits, washing device, process efficiency, semi-industrial tests, laboratory
research, technogenic waste, extraction of gold, sand-clay fraction, environmentally friendly solvents |
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