At the same time as the cyanidation leaching, the gold extraction method of adsorbing gold by activated carbon is called a carbon leaching method. The method of cyanide leaching and carbon adsorption is carried out in the same tank, so that the number of leaching tanks can be completely omitted or greatly reduced. Since the time required for leaching is longer than the adsorption, and the appropriate adsorption rate is only achieved when the concentration of gold in the slurry reaches a certain level. Therefore, the first tank or the first two tanks are usually used as separate leaching tanks, and the remaining tanks are used as leaching adsorption tanks.
The main advantage of the carbon leaching method is that it can save infrastructure and production costs; the dissolution rate of gold is accelerated due to adsorption while leaching, and the recovery rate of ore gold which is easy to dissolve gold is in other methods. However, since the leaching takes longer than the adsorption time, the density of carbon in the adsorption tank of the carbon leaching method is high, and the amount of gold accumulated in the system is also large, and the quality and operation requirements of the carbon are more strict. Otherwise, the loss of gold is caused by the generation of more fine carbon by abrasion.
Gold extraction by carbon leaching is the most ideal method for easy leaching materials.
Weathering steel, i.e. atmospheric corrosion-resistant steel(Corten Steel), is a series of low-alloy steel between ordinary steel and stainless steel. Weathering steel is made of ordinary carbon steel with a small amount of corrosion-resistant elements such as copper and nickel. It has the characteristics of toughness, plasticity, forming, welding and cutting, abrasion, high temperature and fatigue resistance of high-quality steel. The weathering resistance is 2-8 times of ordinary carbon steel and the coating performance is 1.5-10 times of ordinary carbon steel. At the same time, it has the characteristics of rust resistance, corrosion resistance, life extension, thinning and consumption reduction, labor saving and energy saving. Weathering steel is mainly used in railway, vehicle, bridge, tower, photovoltaic, high-speed engineering and other steel structures exposed to the atmosphere for a long time. It is used to manufacture containers, railway vehicles, oil derricks, seaport buildings, oil production platforms and containers containing hydrogen sulfide corrosive medium in chemical and petroleum equipme.
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