Gold-bearing pyrite beneficiation process

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Nowadays, high-grade and easy-to-process gold ore resources are becoming less and less. Gold-bearing minerals mostly exist in the form of inclusions, such as in pyrite and arsenopyrite minerals. Usually, it is difficult to effectively extract gold from such gold-bearing materials using conventional beneficiation methods. This article takes a gold-bearing pyrite ore as an example to introduce its gold beneficiation process!

Ore properties of gold-bearing pyrite

This gold mine belongs to the medium-low temperature hydrothermal gold deposit. Gold exists in pyrite and gangue ore in the form of fine-grained inclusions. Almost all sulfur exists in the form of pyrite, with only a very small amount of chalcopyrite, and a small amount of fine-grained pyrite is encapsulated in the gangue minerals. There are three main forms of gold: first, a small amount of free gold exists in the form of natural gold, accounting for about 15% of the total gold in the sample; second, gold in pyrite, accounting for about 84% of the total gold in the sample; third, gold wrapped in gangue minerals with fine-grained pyrite accounts for about 1%. The gold wrapped in pyrite accounts for 88.21%, the gold in open fissures in pyrite accounts for 11.79%, and the gold in pyrite accounts for 84% of the total gold in the sample, of which the ratio of wrapped gold to fissure gold is about 9:1.

Gold extraction process of gold-bearing pyrite

The gold inclusions in pyrite are distributed in the pyrite lattice. The gold in pyrite is difficult to cyanide leached. In order to recover the gold in the sulfur concentrate, the pyrite inclusions of gold must be destroyed to fully dissociate sulfur and gold. Roasting pretreatment can increase the porosity of pyrite, which is conducive to the full exposure of the gold inclusions. Therefore, the sulfur concentrate is first pyro-roasted and then the slag is cyanide leached to recover sulfur and gold.

1. Fire roasting desulfurization process

In fire roasting desulfurization, sulfur is recovered as a by-product. During the roasting process, the roasting temperature is 800℃ and the roasting time is 3h. After the sulfur concentrate is roasted by fire, 99.79% of the sulfur in the sample can be removed in the form of sulfur dioxide (recovered as a by-product). At the same time, the gold grade of the slag is increased to 64.38g/t, creating favorable conditions for the next step of gold leaching.

2. Slag cyanidation gold leaching process

Using sulfur concentrate slag as the raw material for gold leaching, the grinding fineness is -0.074mm accounting for 75%, the slurry liquid-solid mass ratio is 2:1, and the slurry is adjusted with lime to a slurry pH value of 9-11. Cyanidation gold leaching is carried out. The final gold leaching rate is 87.14%, and the sulfur recovery is 99.79%.

The above is an introduction to the gold extraction process of a gold-bearing gold ore. In actual ore dressing plants, whether it is natural gold or gold ore containing other minerals, the choice of process is very important when dressing. Therefore, it is recommended to conduct gold ore dressing test analysis first, and design and customize suitable gold ore gold extraction process and complete set of gold extraction equipment according to the situation to obtain a more ideal return on investment.

Xinhai has very rich experience in gold ore dressing and smelting, and has helped users complete several gold ore dressing projects in many countries. If you need, please consult, hotline 15311826613!