high capacity gold beneficiation test

high capacity gold beneficiation test

Activated Carbon in Gold Cyanidation

Activated carbon, a material produced from carbon rich sources, offers an incredibly porous surface structure, which creates a vast surface area on which to adsorb materials. This porous structure, in combination with attraction forces, allows activated carbon to capture material components and hold on to them for later recovery. This diverse material is used throughout a number of industries to pull contaminants from liquids or gases, such as in the purification of water, the scrubbing of pollutants from gases at industrial processing facilities, and even in the food and beverage industry to ensure product quality is maintained. In the gold beneficiation process, activated carbon is a vital tool, used to separate gold that has been dissolved in a cyanide solution, so that it can be recovered.

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The gold cyanidation process is a series of steps that vary depending on the characteristics of the deposit and the type of mine. Although not always the case, this process typically begins with mined gold ore being crushed and ground in order to make the gold more accessible. Crushed ore may then be agglomerated in an agglomeration drum prior to leaching. Agglomeration creates more uniformly shaped and sized particles so that the leaching agent can more effectively percolate through the ore particles, as is demonstrated in the figure below. Through reaction with the ore, the cyanide leaching solution, typically sodium or potassium cyanide, forms an aqueous solution of a cyanide gold complex.¹ The activated carbon is then mixed with the pregnant leaching solution. Here, the gold is adsorbed onto the surface of the activated carbon, now considered loaded. The gold can then be desorbed from the loaded carbon in a process known as elution Often called loading capacity, the adsorptive capacity of activated carbon refers to how much the activated carbon can adsorb. Adsorptive capacity is linked to the physical and chemical properties of the activated carbon.³ Adsorption Rate The rate of adsorption is also largely affected by both physical and chemical properties of the activated carbon.³ Mechanical Stren...

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One of the many benefits to using activated carbon is that it is reusable. Instead of purchasing new activated carbon, the saturated carbon can be reactivatedand used again. How Reactivation Works During elution, an acid wash step helps to partially reactivate the spent carbon by removing some inorganic components. While this does reactivate the carbon to an extent, organic components unaffected by acid must still be removed.²This is commonly carried out through the use of a rotary kiln a rotating vessel which utilizes high temperatures to remove undesirable components through a series of chemical reactions and phase changes. Upon reactivation, activated carbon is again ready to act as an adsorbent, and can be recycled back into the process anew.

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The gold cyanidation process is a primary method of gold beneficiation. Activated carbon is a critical component in the beneficiation of gold ore, allowing this widespread process to occur because of its ability to recover gold from the gold cyanide complex. Depending on the deposit, some silver ores may also be processed via cyanidation. Here too, activated carbon is the catalyst for recovery of this precious metal. FEECO has been an expert in thermal processing since 1951. We can provide heavy duty, reliable custom rotary kilns for activated carbon regeneration. For more information on our custom rotary kilns, contact us today! Sources 1. United States. Environmental Protection Agency. Office of Solid Waste, Special Waste Branch. Technical Resource Document: Extraction and Beneficiation of Ores and Minerals Gold. Vol. 2. 1994. Web. 19 Sept. 2016. 2. Elution Carbon Reactivation Resource Book. . https://rsteyn.files.wordpress /2010/07/elution and carbon reactivation basics...

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