Research on the All - Slime Cyanidation Leaching Test of Oxidized Quartz Vein - Type Gold Ore

Introduction

In the realm of gold mining and extraction, the treatment of different types of gold ores is a crucial area of research. This article focuses on the all - slime cyanidation leaching test of an oxidized quartz vein - type gold ore, which has its own unique characteristics and challenges.

Characteristics of the Oxidized Quartz Vein - Type Gold Ore

The gold ore in question is of the oxidized quartz vein type.

Fine - grained Gold Particles

One of the most prominent features of this ore is the extremely fine - grained nature of the gold particles. The average particle size of the gold is only 0.0113 mm.

Encapsulation of Gold

A significant proportion of the gold, accounting for 64.68%, is encapsulated within pyrite, limonite, and quartz. Moreover, a part of the gold exists in the form of fine - grained particles wrapped in earthy limonite. Such fine - grained and dispersed gold in the oxidized ore poses great difficulties for the extraction process.

All - Slime Cyanidation Leaching Process

Grinding Fineness Determination

To address these challenges, the all - slime cyanidation leaching process was adopted. Firstly, the grinding fineness of the raw ore was determined. It was set that the content of - 200 mesh accounted for 85%. This fine grinding is essential to liberate the gold particles as much as possible from the surrounding minerals, increasing the contact area between the gold and the leaching agent.

Alkali Pretreatment

Subsequently, lime was added to the gold ore for alkali pretreatment. The addition of lime serves multiple purposes. It can adjust the pH value of the pulp, creating a more favorable alkaline environment for the cyanidation leaching process. In an alkaline medium, the stability of the cyanide solution is enhanced, and at the same time, it can also suppress the dissolution of some harmful impurities, reducing their negative impact on the leaching of gold.

Gold Leaching with Sodium Cyanide

Finally, Sodium cyanide was added for gold leaching. Through this series of operations, remarkable test results were achieved.

Test Results

The leaching rate reached 96.89%, indicating that a large proportion of the gold in the ore was successfully dissolved into the solution. Additionally, the adsorption rate was as high as 99.55%, which means that most of the dissolved gold could be effectively adsorbed and recovered.

Significance and Conclusion

These results demonstrate the effectiveness of the all - slime cyanidation leaching process for this specific type of oxidized quartz vein - type gold ore. The successful application of this process not only provides a feasible solution for the extraction of gold from such ores but also has important implications for the gold mining industry. It can help improve the utilization rate of gold resources, reduce waste, and increase the economic benefits of gold mining enterprises.

In conclusion, the research on the all - slime cyanidation leaching test of this oxidized quartz vein - type gold ore has made significant progress. However, continuous efforts are still needed to further optimize the process, reduce costs, and improve environmental friendliness in the future.