Wechat QR code
Wechat QR code
15311826613
Click to add WeChatOxidized gold (also known as gold trioxide Au2O3) is an oxidized gold ore belt formed after a long weathering process. As a difficult-to-select gold ore, oxidized gold has a relatively complex beneficiation process. The currently available gold extraction methods include gravity separation. Method, flotation method, magnetic separation method, mercury amalgamation method, heap leaching method, cyanide method, sulfurization method and oxidation roasting method. Let’s learn about them together below.
Gravity separation for gold extraction mainly relies on the density difference between gold and other minerals. Gold is separated from other minerals through the centrifugal force generated by gravity separation equipment. There are jig gravity separation and shaking table gravity separation for gold extraction. There are several ways to extract gold through gold and chute gravity separation, but no matter which method, a more ideal gold concentrate cannot be obtained, and other methods need to be combined to extract gold.
Gold extraction by flotation is a commonly used method for extracting gold from oxidized ores. It mainly relies on the difference in surface properties between gold and gangue minerals. Through the injection of chemicals, the useful gold minerals become hydrophobic, and the flotation is completed as the bubbles rise. Withdraw money. Generally, when extracting oxidized gold, flotation needs to be combined with other methods to form a combined process to effectively obtain the ideal gold concentrate. Currently, the commonly used combined flotation methods include flotation + flotation concentrate cyanidation, flotation + concentrate roasting + Roasted sand cyanidation, flotation + flotation concentrate fire treatment and flotation + tailings/medium ore cyanidation + concentrate roasting and cyanidation.
Flotation + cyanidation of flotation concentrate: It is mainly suitable for gold-bearing quartz vein type sulfide ores. After first obtaining a small amount of concentrate through flotation, cyanidation is performed to extract gold.
Flotation + concentrate roasting + roasted sand cyanidation: generally suitable for processing difficult gold minerals, such as arsenic-containing gold minerals, zinc- and sulfide-containing gold minerals, etc. The concentrate is first obtained by flotation and then roasted. The main purpose of roasting is to remove arsenic and antimony elements during the cyanidation process.
Flotation + flotation concentrate fire treatment: suitable for processing multi-metallic sulfide gold ores. During flotation, gold will enter the copper or lead concentrate that is closely symbiotic with it, and the copper-gold concentrate or lead-gold concentrate can be obtained directly. It is sent to the smelter for smelting and gold concentrate is recovered from it.
Flotation + tailings/medium ore cyanidation + concentrate roasting and cyanidation: suitable for processing gold-containing minerals such as gold, pyrrhotite, chalcopyrite and other sulfide minerals. The easily floating gold sulfide of this type of ore can be produced as a concentrate, and then the middlings and tailings are roasted and then hydrogenated to obtain the gold and silver minerals remaining in the middlings and tailings.
The main purpose of magnetic separation for gold extraction is to remove magnetic impurities present in gold minerals, mainly by utilizing the magnetic properties of the minerals for separation.
The amalgamation method is an older method of extracting gold. Generally, the gold ore is first dissociated into monomers, and then the gold ore powder is mixed with liquid mercury to form an amalgam. The mercury is then heated to evaporate and leave the gold. Methods.
Heap leaching to extract gold is a commonly used process in gold ore dressing plants, especially for low-grade oxidized gold that is difficult to process. The process is simple, the gold extraction efficiency is high, and the investment cost is low.
This method is to pile gold ore crushed to a certain particle size into piles, and then spray sulfuric acid or alkaline cyanide as a leaching agent onto the top of the ore pile. As the solution penetrates the ore pile, the gold is leached, and Recycle it.
Gold cyanide extraction uses hydride under alkaline conditions to form a soluble gold cyanide mixture with gold. Then, the gold is separated from the solution through adsorption, precipitation and analytical electrolysis processes to obtain gold concentrate. . However, in cyanide gold extraction, cyanide is a toxic substance, and safety measures and environmental controls must be strictly implemented when using it to ensure safe handling and disposal of cyanide solutions.
Gold sulfide extraction is to convert oxidized gold into sulfide ore, and then select it using traditional techniques. Commonly used oxidized gold sulfide gold extraction methods include roasting, high-pressure oxidation, biological oxidation, and chemical sulfidation. After roasting, gold needs to be further extracted, which can be achieved through cyanidation, flotation or leaching.
Gold extraction by oxidation roasting is to expose gold-containing ores to oxygen under high temperature conditions to oxidize the gold into soluble compounds, and then use leaching to extract the gold from the oxides. Commonly used methods include direct smelting, chlorination roasting, acid roasting, and high-pressure oxidation. After roasting, gold needs to be further extracted, which can be achieved through cyanidation, flotation or leaching.
The above is an introduction to 8 kinds of gold oxidation gold extraction process methods. In actual mineral processing plants, there are many gold beneficiation methods. No matter which one, only by choosing a suitable process can we effectively obtain gold concentrate. So how to choose? It is recommended to conduct mineral processing test analysis and analyze and design a suitable gold extraction process to achieve ideal economic benefits.
Consultation
153-1182-6613
Consult
Message
