What is the Cyanide Gold Mining?

Cyanide extraction of gold may be used in areas where fine gold-bearing rocks are found. Sodium cyanide solution is mixed with finely ground rock that is proven to contain gold or silver, and is then separated from the ground rock as gold cyanide or silver cyanide solution. Zinc is added to precipitate out residual zinc as well as the silver and gold metals. The zinc is removed with sulfuric acid, leaving a silver or gold sludge that is generally smelted into an ingot then shipped to a metals refinery for final processing into 99.9999% pure metals.   Sudan small capacity cheap Gold Cyanide Plant

Recovery Ration of Yufeng Gold Cyanidation
Gold cyanidation (also known as the cyanide process or the MacArthur-Forrest process) is a metallurgical technique for extracting gold from low-grade ore by converting the gold to a water soluble coordination complex. It is the most commonly used process for gold extraction. Production of reagents for mineral processing to recover gold, copper, zinc and silver represents approximately 13% of cyanide consumption globally, with the remaining 87% of cyanide used in other industrial processes such as plastics, adhesives, and pesticides.   Sudan small capacity cheap Gold Cyanide Plant

Application of Yufeng Gold Cyanidation

The ore is comminuted using grinding machinery. Depending on the ore, it is sometimes further concentrated by froth flotation or by centrifugal (gravity) concentration. Water is added to produce a slurry or pulp. The alkaline ore slurry can be combined with a solution of sodium cyanide or potassium cyanide, however many operations utilize calcium cyanide, which is more cost effective. To prevent the creation of toxic hydrogen cyanide during processing, lime (calcium hydroxide) or soda (sodium hydroxide) is added to the extracting solution to ensure that the acidity during cyanidation is maintained over pH 10.5 - strongly alkaline. Lead nitrate can improve gold leaching speed and quantity recovered, particularly in processing partially oxidized ores.

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How to Operate the Gold Cyanidation Mining?

1. Loading gold into carbon
Leached pulp and carbon are transferred in a counter current flow arrangement between a series of tanks, usually numbering 4 to 6. In the final tank, fresh or barren carbon is put in contact with low grade or tailings solution. At this tank the fresh carbon has a high activity and can remove trace amounts of gold (to levels below 0.01 mg/L Au in solution). As it moves up the train, the carbon loads to higher and higher concentrations of gold, as it comes in contact with higher grade solutions. Typically concentrations as high as 4000 to 8000 grams of gold per tonne of carbon (g/t Au) can be achieved on the final loaded carbon, as it comes in contact with freshly leached ore and pregnant leach solution (PLS). This can be measured by comparing the amount of gold extracted from the carbon to the amount of carbon used.    Sudan small capacity cheap Gold Cyanide Plant
 
2. Removal of gold from carbon
The final loaded carbon then is removed and washed before undergoing "elution" or desorption of gold cyanide at high temperature and pH. Ethanol can also be used to desorb gold from activated carbon, but safety concerns have slowed its acceptance in the gold extraction industry.   Sudan small capacity cheap Gold Cyanide Plant
 
3. Electrowinning
The rich eluate solution that emerges from the elution process is passed through electrowinning cells where gold and other metals are precipitated onto the cathodes. Smelting of the cathodes material further refines the gold and produces gold ingots suitable for transport to a refinery. For further information on gold smelting, see the article on gold extraction.   Sudan small capacity cheap Gold Cyanide Plant

We (Zhengzhou Yufeng Heavy Machinery Co.,LTD) are manufacturer in Zhengzhou, which serves as the largest base of Chinese industrial technology, and the busiest container port in the world. The competition in this city is severe, only companies with ending technology, stable workforce, and effective cost management could survive. With 25 years of efforts and innovation,our company is now a leading brand in China.

Affordable, high-quality machines. Our highly competitive price relies upon our ability to minimize our costs, of which our

competitors don’t.

We promise to the customers:

1. We are factory(NOT Dealer)

2. We own our factory & Land (NOT Rent)

3. Staff reside in factory(Stable Workforce)

Producing high-quality and reliable machines is always our first priority, because we know that our success depends entirely on the satisfaction of our customers. We never give-up quality to save cost, instead we manufacture our machines to supply you the best need.

If you have any questions or want to learn about the gold mining machines, you are welcome to contact Linda.

Tel: 86-15890978137            Skype: yfchinamachine

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