How to deal with arsenic in gold mines? Summary of 3 arsenic gold ore pretreatment methods!

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What is arsenic gold ore? In fact, there are arsenic-containing pyrite, orpiment and realgarite and other elements in gold ore. Nowadays, they are often wrapped in the form of fine particles, making the gold ore more difficult to select. If the cyanide method is used directly to extract gold, it will not be effective. If you want to improve the recovery rate of leached gold, arsenic-containing gold ores can be treated with arsenic removal first, and then cyanide gold beneficiation. Below, Xiaomian will introduce to you the common pretreatment methods for arsenic removal in arsenic-containing gold mines.

1. Oxidative roasting and arsenic removal method for arsenic-containing gold ores

Oxidative roasting method to remove arsenic is The method of decomposing sulfide to expose gold particles, allowing arsenic, sulfur, etc. to be oxidized and volatilized, improves good conditions for the next step of cyanide leaching gold.

However, during the process of oxidative roasting and arsenic removal, a large amount of toxic gases such as sulfur dioxide and arsenic trioxide will be released. Although such toxic gases can be recovered, there will still be some low-concentration gaseous sulfur oxides and arsenic oxidized materials are discharged, thereby polluting the surrounding environment.

2. Wet chemical arsenic removal method for arsenic-containing gold ores

Wet chemical arsenic removal can include atmospheric pressure alkali leaching pretreatment and hot pressure chemical pretreatment.

Normal pressure alkali leaching pretreatment for arsenic removal: It is mainly a method of pretreating minerals using alkaline media under normal pressure, but most of them use a comprehensive separation method of physics and chemistry. , using the grinding and leaching process and its main equipment - tower grinding and leaching machine, to carry out ultra-fine grinding of arsenic-containing refractory gold ores, and then use an enhanced pretreatment stirring tank to perform enhanced alkali leaching pretreatment at normal temperature and pressure. This can remove arsenic and desulfurization or fully dissociate gold and sulfide, and then cyanide to achieve efficient gold extraction.

Hot-pressure chemical pretreatment for arsenic removal: (also called pressure leaching method) is a method of high-temperature oxidation of sulfides, iron compounds and arsenides in acidic media , there are three forms, namely: all sulfides are oxidized to sulfur or sulfate, Fe²⁺ produced during the reaction is oxidized to Fe³⁺, arsenic is Oxidized to arsenate. This method has a short process, high arsenic leaching rate and no toxic substances such as SO₂.

3. Bacterial oxidative arsenic removal method for arsenic-containing gold mines

Bacterial oxidative arsenic removal generally involves Thiobacillus ferrooxidans, Thiobacillus thiooxidans, and Leptospirillum ferrooxidans. Two or three of the bacteria are combined to complete arsenic removal by leaching. After biological oxidation pretreatment, the gold leaching rate is high. After bacterial oxidation pretreatment, the gold mine has a high arsenic removal rate and a good weight loss rate.

The above are three common pretreatment methods for arsenic-containing gold ore removal. In the actual mineral processing plant, if you encounter arsenic-containing gold ore, you should first carry out Ore beneficiation test. Only by selecting a suitable arsenic removal pretreatment method and a reasonable gold ore leaching and beneficiation method based on the test analysis can the ideal gold ore recovery rate be obtained.

Xinhai Mining has more than 30 years of experience in mineral processing, and has developed a number of new gold mineral processing methods, used in actual mineral processing plants, have achieved ideal recovery rates. If you have any needs, please feel free to consult Xinhai Mining Equipment!