What Are the Primary Gold Ore Beneficiation Technologies?

01Conventional primary gold ore beneficiation process

Conventional primary gold ore contains a high content of natural gold and has good selectivity. Single processes such as gravity separation, flotation, and cyanide leaching are often used in the beneficiation process. A simple reagent system can obtain a high gold recovery rate. With the continuous improvement of the utilization rate of mineral resources, conventional beneficiation processes are gradually developing in the direction of refinement and intelligence. The use of enhanced grinding operations can achieve the purpose of optimizing the degree of dissociation of gold particles, thereby improving the gold recovery rate. In addition, fine grinding technology + flotation process can be used for the treatment of arsenic-antimony gold ore, thereby improving the recovery rate of gold-arsenic mixed concentrate.

When the carbon content in gold ore is high, the use of traditional processes will increase the loss rate of gold. Therefore, the development of decarbonization technology has received attention in recent years. Continuously strengthening the decarbonization process can improve the leaching efficiency of gold. In addition, the oxidation pretreatment process can also reduce the adsorption of carbon on gold. With the development of automatic control technology, the application of intelligent mineral processing control systems can also improve the stability of conventional gold ore beneficiation technology and the economic benefits of mineral processing plants.

02Complex and refractory primary gold ore beneficiation process

At present, the proportion of refractory gold ores in gold reserves is increasing. Because this type of ore has the characteristics of "poor, fine, and mixed", the gold in the ore is mostly embedded in pyrite, arsenopyrite and other sulfide minerals in the form of ultra-fine particles, which makes it difficult to effectively recover the gold particles in the traditional physical dressing method. Therefore, in order to solve this problem, a variety of combined gold ore beneficiation processes and enhanced pretreatment technologies are used to improve the dressing indicators of refractory gold ores.

The ore type of a gold mine is complex, and the gold particles are embedded in pyrite and arsenopyrite minerals. It is difficult to recover the gold particles using traditional flotation technology. The concentrator adopts a combined process of flotation-fire roasting-cyanide leaching to achieve a higher gold recovery rate. In addition, bacterial oxidation, bioleaching and ultrafine grinding-enhanced leaching processes can all be used to treat some difficult-to-select gold ores.

03Gold ore enhanced pretreatment technology

Enhanced pretreatment technology is to treat refractory gold ore through physical, chemical or biological methods to improve the selectivity of gold. Common enhanced pretreatment methods include roasting oxidation method, biological preoxidation method and chemical oxidation method.

1. Roasting oxidation method: This is a common pretreatment method for refractory gold ore, which is often used in the treatment of high-sulfur and insoluble gold ore. This method uses high-temperature roasting to oxidize and decompose the sulfide in the ore, and the encapsulated gold is released, so that the effect of subsequent cyanide leaching will be effectively improved.

2. Biological pre-oxidation method: This is a green and environmentally friendly mineral processing pretreatment method. This method uses Thiobacillus thiooxidans to oxidize and decompose the sulfide in the ore, thereby releasing the encapsulated gold. This pretreatment method has the advantages of mild conditions, low consumption of cyanide agents, and low environmental pollution.

3. Chemical oxidation method: This method uses highly oxidizing reagents such as hydrogen peroxide and potassium permanganate to oxidize the difficult-to-process gold ore, and the encapsulated gold is released after the ore structure is destroyed. This method has a fast reaction speed and is more suitable for the mineral processing of specific types of difficult-to-process ores.

The above content is a brief introduction to the primary gold ore beneficiation process, including the beneficiation of conventional gold ore and the beneficiation of refractory gold ore. In addition, the enhanced pretreatment technology of gold ore has an important influence on improving the recovery rate of gold. In actual production, the gold ore beneficiation technology needs to be selected according to the characteristics of the ore and the production requirements of the beneficiation plant. Reasonable beneficiation technology and equipment are important guarantees for obtaining a good recovery rate. Xinhai Mining can provide you with gold ore beneficiation tests, customized design of gold ore beneficiation solutions, and provide in-place services from equipment manufacturing, installation and commissioning to mine production and operation. Welcome to consult.