Extraction method of gold in ore

The gold content in the ore is extremely low. In order to extract gold, it is necessary to crush and grind the ore, and enrich it in advance or separate gold from the ore through mineral processing. Gravity separation and flotation are widely used in gold mineral processing, and gravity separation plays a very important role in placer gold production. Flotation is a widely used mineral processing method in rock gold mines. At present, about 80% of rock gold mines in China use this method to select gold, and the level of mineral processing technology and equipment has been greatly improved.

(1) crushing and grinding

(2) Re-election

Gravity separation is widely used in rock gold mines, mostly as an auxiliary process for recovering coarse gold in grinding circuit, which creates favorable conditions for flotation and cyanidation processes, improves mineral processing indexes, improves the total recovery rate of gold, and plays a positive role in increasing production and reducing costs.

(3) Flotation

According to the investigation, about 80% of rock gold mines in China use flotation to select gold, and most of the concentrates produced are sent to non-ferrous smelters for treatment. Due to the increasing development of cyanide gold extraction and the efforts of enterprises to improve economic benefits and reduce concentrate transportation losses, the product structure has changed greatly in recent years, and more on-site treatment has been adopted (of course, due to the contradiction between dressing and metallurgy and pricing problems, mines are forced to treat themselves on the spot), which has promoted the great development of flotation technology and occupied a very important position in gold production.

(4) Chemical beneficiation-Shui Ye gold extraction process.

1. Gold extraction by mixed mercury method

The process of extracting gold from mixed mercury is an ancient process, simple and economical, and suitable for the recovery of crude monomer gold. Many gold mines in China still use this method. With the development of gold production and the progress of science and technology, the process of extracting gold with mixed mercury has been continuously improved and perfected.