Refactory gold ore is resistant to the traditional cyanide leaching method, and it is difficult to extract gold using the conventional process. The difficult selection of this kind of ore is reflected in the wrapping or binding of gold, so that it cannot be contacted by the leagent. The beneficiation technology of difficult gold ore involves a special beneficiation process, aiming to overcome the difficulties caused by the complex mineral composition of the ore. There are some common beneficiation techniques and influencing factors for refractory gold ore processing that will be described below.
Oxypressing is a hydrometallurgical process where gold ore comes in contact with oxygen under high pressure and high temperature. The process oxidizes the sulfide minerals in the ore, making the gold dissociated and easy to leach out. The oxidized gold can be recovered using conventional cyanogen leaching or other appropriate methods.
Microbial leaching, also known as bacterial leaching or biological oxidation, uses microorganisms to oxidize sulfide minerals in refractory gold ore. Some bacteria, such as thiophilus, can catalyze the oxidation process and make gold easy to leach, which can improve the leaching rate. Microbial leaching can be performed in a stirring tank or heap leaching depending on the operating scale.
The heat treatment method of refractory gold mine is the process of heating the ore in the presence of air or oxygen. The process oxidizes sulfide minerals and transforms them to a more soluble form for subsequent gold extraction. Heat treatment can be performed in a fluidized bed reactor or rotary kiln, depending on the ore and process requirements.
Superfine powder, also known as ultrafine grinding or stir grinding, is a mechanical process that crushing the ore to very fine particles where the gold particles can be fully exposed. By achieving finer particle sizes, the gold-containing minerals in the ore can be dissociated more efficiently, improving their accessibility to the subsequent leaching or extraction process.
Chemical pretreatment methods use chemical reagents to change the ore properties and improve the gold recovery rate. These methods mainly include oxidative pretreatments, such as the use of chlorine, bromine, or acid solutions to decompose refractory minerals and expose gold for leaching.
1. Characteristics of ore: the mineral composition and distribution of ore influence the selection of mineral processing technology. The presence of specific minerals, such as pyrite, arsenic pyrite, or telluride, may affect suitable treatment processes.
2. Particle size: The particle size of the ore affects the efficiency of dissociation and subsequent extraction. Finer crushing may be required to expose gold particles, improve leaching ability.
3. Sulfur content: the content and distribution of sulfide minerals affect the selection of the oxidation process. Higher sulfide content may require more aggressive oxidative treatments, such as pressurized oxygen.
4. Pose mineral content: The presence of gangue minerals may affect the efficiency of gold recovery. Certain gangue minerals may consume reagents or interfere with the leaching process.
5. The occurrence form of gold: The combination of gold to other minerals (such as quartz or silicate) may affect the extraction accessibility of gold. Complex associations may require additional steps to achieve efficient gold recycling.
6. Economic considerations: the economic benefit of the mineral processing process is an important factor to determine the appropriate process. Factors such as capital and operating costs, energy consumption, and gold recovery potential are considered.
For specific refractory gold ores, these factors need to be carefully evaluated and comprehensively tested to select the most suitable beneficiation technology. Xinhai Mining proposes to analyze the original ore to determine the characteristics of the ore itself so as to determine the appropriate gold mine processing process. Xinhai mine has a lot of successful cases of gold mine beneficiation project, for details, please leave a message for consultation.
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