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Microwave regeneration of granular activated carbon

Author: langfeng1 Time: 2017-06-16

Microwave regeneration of granular activated carbon

for the CIP process The carbon-in-pulp process is widely used for the recovery of gold. The carbon, which is used to adsorb the gold cyanide molecule, is periodically removed from the adsorption tanks to allow removal of the gold by elution. The carbon is then usually acid washed to remove inorganic compounds and regenerated at 650-850 C in a steam atmosphere to remove other foulants such as flotation reagents, lubricating oils and humic acids which would foul the carbon and reduce its performance. Regenerated carbon is sized and returned to the CIP circuit. Regeneration is conventionally done in rotary kilns or vertical tube furnaces. These may be either electrically-heated or gas-fired. Both units rely on indirect heating of the carbon charge. Direct resistive heating is also used for carbon regeneration, the so-called Minfurn being a continuous version of the earlier  furnace.

 

Advantages of the technology are primarily cited to be low maintenance costs. Recently a resistively-heated rotary kiln has been developed. Microwaves can readily heat granular activated carbon directly, suggesting that microwave regeneration would offer possible advantages over conventional regeneration. These include rapid and precise temperature control of the carbon inventory itself, a more compact furnace and possible energy savings. 

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