The gold content in oxidized gold ore is low, and the gold minerals therein mainly exist in the form of free gold, gold minerals, and a combination of gold and iron oxides. Compared with native gold ore, oxidized gold ore undergoes a long period of oxidation, and its structure becomes loose, which is easily leached by acid or cyanide. Therefore, the beneficiation process of oxidized gold ore is more complicated than that of native gold ore, and special technical means are required for treatment. The following will introduce you to the beneficiation technology of oxidized gold ore, helping you understand the treatment method of oxidized gold.
Due to the complex existence of gold in oxidized gold ore, it is necessary to select appropriate treatment methods according to the characteristics of the ore during the dressing process. The common oxidized gold ore dressing processes are as follows:
1. Gravity separation: Enriching gold minerals by gravity separation, mainly suitable for processing ores containing large particles of free gold.
2. Flotation: When the oxidized gold ore contains non-ferrous metal minerals or sulfide minerals, the flotation method can effectively treat such ores.
3. Cyanidation: Cyanidation is one of the commonly used methods for treating oxidized gold ore. Cyanidation needs to be combined with roasting and pressure oxidation pretreatment methods to improve the leaching rate of gold.
Cyanidation is a leaching process widely used in gold ore processing. It mainly uses cyanide ions to form soluble gold-cyanide complexes with gold to achieve gold leaching. There are some difficulties in the cyanidation process of oxidized gold ore. For example, gold oxide is difficult to be directly leached. Pretreatment methods such as roasting or pressure oxidation can improve the cyanidation efficiency of oxidized gold.
1. Roasting treatment: After the oxidized gold ore is heated to a certain temperature under high temperature conditions of 600-800℃, the gold mineral reacts with elements such as iron and sulfur, and the gold oxide is converted into a more soluble form. After roasting, the cyanidation process of the oxidized gold ore is smoother.
2. Pressure oxidation method: Under high temperature, high pressure and oxygenation conditions, the inherent structure of gold is destroyed. The leaching efficiency of the oxidized gold ore after pretreatment is improved, the consumption of cyaniding agent is reduced, and the recovery rate of gold is improved. This method is more suitable for gold ores containing sulfides.
Flotation is one of the commonly used methods in the ore dressing process, especially suitable for the treatment of oxidized gold ores containing non-ferrous metal minerals such as copper, lead and zinc or pyrite and molybdenite sulfide minerals in oxidized gold ores. When treating oxidized gold ores, it is necessary to add flotation reagents to achieve effective separation of gold minerals from impurity minerals and improve the recovery rate of gold. Common types of collectors used in the flotation of oxidized gold ores include xanthate, black medicine or fatty acid reagents, commonly used frothers include pine oil and butanol, and commonly used pH adjusters include lime, sulfuric acid and sodium carbonate. According to the ore characteristics of oxidized gold ores, a reasonable flotation reagent system is formulated to optimize the flotation process and improve the utilization efficiency of oxidized gold ore resources.
As mentioned above, when treating oxidized gold ore, the gravity separation process is often used for ores with high gold content and large gold mineral particles. Commonly used gravity separation equipment includes shaking tables, jigging equipment and spiral chutes, which use the high density of gold to separate it from gangue minerals. They are particularly suitable for placer gold and heavy mineral ores rich in gold. Gravity separation technology for oxidized gold ore has the advantages of simple process, low cost and environmental protection. In actual production, gravity separation is often used for the initial treatment of oxidized gold ore or the reprocessing stage of tailings.
When processing oxidized gold ore, it is necessary to consider not only the technical feasibility, but also the environmental impact and economic benefits caused by the dressing technology. The cyanide wastewater and waste gas generated in the cyanidation method of oxidized gold ore will pollute the environment, so effective wastewater treatment measures such as adsorption, oxidation, precipitation, etc. are needed. Because the oxidized gold ore dressing technology has a certain complexity and the dressing cost is relatively high, it is necessary to improve the economic benefits by improving the recovery rate, reducing energy consumption and optimizing the process flow.
The above content is an introduction to the selection of oxidized gold ore dressing technology, cyanidation, gravity separation, flotation and other technologies. With the increasing maturity of oxidized gold ore dressing technology and the continuous development of technology, the recovery rate and economic efficiency of oxidized gold ore are constantly improving. Selecting reasonable pretreatment methods and dressing technology can effectively improve the recovery rate of gold, reduce environmental impact and improve the economic benefits of the dressing process. In the future, new technologies will continue to be applied in oxidized gold ore dressing, and its processing will be more efficient, environmentally friendly and economical.
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