How do you choose activated carbon for gold?
Whether the cyanidation leaching process for gold production adopts the heap leaching method or the carbon slurry method, the key step is to use the highly selective adsorption of gold-containing compounds by activated carbon to achieve the purpose of high-efficiency, rapid and low-cost enrichment of gold.
The performance of activated carbon is directly related to:
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The production speed of gold refining, that is, the speed of gold adsorption per unit time;
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Loss rate during gold adsorption
Whether the cyanidation leaching process for gold production adopts the heap leaching method or the carbon slurry method, the key step is to use the highly selective adsorption of gold-containing compounds by activated carbon to achieve the purpose of high-efficiency, rapid and low-cost enrichment of gold.
Once the mine is designed and constructed, the number and total volume of activated carbon canisters are the determined value. The selection of activated carbon with higher gold adsorption capacity can obviously prolong the regeneration cycle of activated carbon, thereby contributing to a higher gold production rate.
With a higher R value, it is quicker that the effect of activated carbon improves the gold production rate.
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R value test
1g of activated carbon will be added to 1 liter of gold solution of a certain concentration (for example, 10mg/L) to extract gold, and testing the remaining concentration of gold solution every 10 minutes until the end of 60 minutes. The R-value can be obtained by this simple calculation.
Generally speaking, with the higher K value, that is, activated carbon must have a higher specific surface area, or a higher iodine adsorption value. Besides, the activated carbon for gold recovery requires most of the micropores.
In the production process of activated carbon, activation and carbonization are used to increase its micropores. In the case of ensuring the iodine value, the strength is also crucial, which is related to the loss rate of gold during the gold absorption process.
Zhulin uses imported coconut shell varieties as raw materials, and adopts large-scale advanced rotary furnace, mainly producing coconut shell activated carbon with excellent capacity and hardness. The iodine adsorption values are 1000-1200 mg/g, respectively, and the hardness values are all above 98%.
Under the same K value and R value, choosing activated carbon with better iodine value and hardness should be an effective means to reduce production cost and improve productivity during gold absorption.
