Abstract
A series of experiments is conducted on laboratory and pilot-production installation for the application of high-voltage pulsed discharge in the processes of enrichment of goldbearing mineral raw materials with a relatively low energy electrical discharge in the pulse of 120 J. At the same time the conglomerates of clay components are breaking down to micron and submicron sizes completely. Solid minerals such as quartz are simultaneously destroyed by defects and grains and withdrawn from the installation with water, thus increasing degree of enrichment of concentrate. The results of the processing by high-voltage pulsed discharges of building sand from the Ob riverbed are given. Discharge energy is 45 J. Relations of fractions in the original sand and in the sand after electroexplosive process show the uniform crushing of sand particles with splitting off particles with size of less than 0.045 mm. A content of chipped particles is 18%. The results of particle-size and X-ray structural analyses are shown.
Highlights
According to scientific literature 70 % of the gold in the lithosphere is represented by particles with size of 100 microns or less
In [1] is reported that the large and the very large gold with size more than 100 microns is produced in Russia
In [2] are shown the data about the gold deposits in the Magadan region, only 5.1 % of this gold with particle size of 50 microns or less is recovered by gravity methods
Summary
According to scientific literature 70 % of the gold in the lithosphere is represented by particles with size of 100 microns or less. The most important problems in the process of enrichment of raw material are the removal of clay components from raw material and the extraction of thin gold (platinum) with particle size less than 50 microns into concentrate.
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