Introduction to the method of extracting gold by percolation and cyanide from gold mines

15311826613

Welcome to consult Xinhai - customized mineral processing plan

Xinhai can provide you with mineral processing tests, mineral processing process and mineral processing equipment selection, mineral processing plant scheme design and construction drawing design; provide mining mineral processing equipment; provide mineral processing plant construction and equipment installation as well as mine management and operation services.

Consultation 153-1182-6613

15311826613

Click to add WeChat

Get product price

WeChat ID has been copied, add friends, and get manufacturer quotations!

Cyanide gold extraction is one of the important methods for gold ore beneficiation. Its process method is simple, the gold extraction rate is high, and it has strong adaptability to ores. Cyanide gold extraction can generally be divided into two types: percolation cyanide gold extraction method and stirring cyanide gold extraction method. Above we focused on the process flow of stirring cyanide gold extraction. This time, this article will focus on percolation cyanide gold extraction method. Method of withdrawing gold.

The percolation cyanidation method mainly treats low-grade gold-containing oxidized ores. Based on the cyanide solution permeating through the ore layer and leaching the gold in the gold-containing ores, the separation effect is better for placers and loose porous materials. good.

The percolation cyanide leaching method has two processes: pool leaching and heap leaching. The cyanide leachate is then percolated and then treated with activated carbon adsorption or zinc powder (silk) replacement.

1. Gold mine pool leaching process

The pool leaching process means that the leaching tank completes the percolation leaching operation. Leaching tanks usually use wooden pools, iron trough pools or cement pools. The leaching pool is equipped with a false bottom (made of perforated acid-resistant boards), which is covered with filter cloth and covered with a grid equipped with wooden or corrosion-resistant metal strips. .

During leaching, the ore is placed in the pool, the leaching agent is added above the pool, and the leachate flows out from the lower part of the false bottom. The false bottom is used to filter and support the ore. The time required for leaching in a percolation tank not only depends on the dissolution rate of minerals by the solvent, but is also closely related to the penetration rate of the solvent in the material layer.

The penetration rate mainly depends on factors such as charging height, material porosity, silt content, leaching agent viscosity and the characteristics of the material itself.

2. Gold ore heap leaching process

The heap leaching process mainly involves transporting the crushed gold-containing ore to a prepared stockyard, building a pile, and then using it with cyanide. The chemical leachate is sprayed or percolated, causing the solution to pass through the ore to produce a percolation leaching effect. The leachate is repeatedly sprayed on the ore pile through multiple cycles. The collected leachate is then adsorbed with activated carbon or replaced with zinc, and the lean liquid is returned to the heap leach operation cycle. use.

The site for heap leaching gold is generally selected on a gentle slope close to the stope and convenient for transportation. Weeds and floating soil should be removed before leaching. , and then tamped it down to build a foundation with a slope of about 5˚. The two sides are higher and the middle is slightly lower, so that the leachate can flow into the storage tank in a concentrated manner. A geomembrane is laid on the stockyard to prevent leakage. A 0.4-meter earth bank and waterproof ditch will be built around the yard to prevent rainwater from flowing into the yard. Before piling the ore, first pile 0.3-meter-thick chunks of lean ore.

The heap leaching cyanide gold extraction method has low production costs and can be put into production quickly. The heap leaching scale can be large or small, and each pile of ore can reach tens of thousands of tons.

The above is an introduction to the two gold extraction methods of gold mine percolation and cyanidation. Xinhai can provide gold extraction methods combined with stirring cyanidation, but it is recommended to carry out the gold extraction method first Ore processing test, according to the properties of gold ore, select a suitable cyanide gold extraction plan to avoid gold loss and reduce investment in the processing plant.