Gold selection

Sand gold mine, the electricity option selection is also very effective method. The gold ore mine is re-elected (shaker or chute, spiral sorting machine, etc.) to enrich the heavy minerals, and then magnetic matching and electric selection are used to improve the gold grade. China has tested a mine and achieved remarkable results.
Ore (-2 mm particle size) with sorting shaker containing gold 120.36g / t, heavy minerals are: 30% magnet ore, iron ore 10% titanium, quartz, feldspar 25%, 7% zircon, angle Amphibole 10%, monazite 3%, limonite 8%, garnet 2%, other mica , tourmaline and so on. When entering the electrification, the materials are divided into two levels of +70 and -70 mesh.
The electric selection process is relatively simple, and both use one rough selection and one sweep. It is proved that the magnetic separation tailings adopt high-voltage electric selection, which can make the gold recovery rate reach 93.91%, and the gold entering the electrification is 387.22g/t. After electrification, the +70 mesh and -70 mesh gold concentrates can be enriched to 13480.93g. /t, the medium mine is 1147.38f/t. If the middle mine is further electrified, the gold recovery rate can be further improved.
After the magnetic product was separated by magneto-wetting, the crude gold concentrate was 24.13 g/t using the nearly identical procedure described above, and the medium ore and tailings did not contain gold.
The selection process is shown in Figure 1.


Figure 1 Sand gold mine selection flow chart

It is clear from the above simple process test that the heavy sand mineral of a gold deposit is matched by magnetic separation and high voltage electric selection. The sorting effect is very significant. When the magnetic separation tailings are electrified, the original ore contains gold 387.22g/ t, after electrification, the gold concentrate can be enriched to 13480.93g/t, and the recovery rate can reach 93.91%; the gold content of the mine in the sweeping selection is 1147.38g/t, and the recovery rate is 5.24%.

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