Microwave heating CIP regeneration of activated carbon
  CIP gold extraction process has been popularized , becoming an important method of extracting gold . Activated carbon used in the Act after several cycles after use , the adsorption capacity decreased significantly , if not regenerated , relying on a new supplement to increase gold charcoal adsorption rate , will increase production costs , therefore, how economical and efficient regeneration of activated carbon quite important.
 Conventional thermal regeneration is externally from raw materials , through a long time to be heated from the table and the inside , forming pores , and can not form new micropores . The microwave heating can overcome these shortcomings . As the microwave has an internal heating , selective heating and rapid heating and other features, using microwave irradiation , activated charcoal rapid evaporation of free water molecules , resulting vapor pressure inside outwards from raw materials fulminant pushed out so dramatically effect, so that the fiber space to expand , while sharply dried, and produce numerous cracks , porous structure material is more significant , the internal surface further expanded, thus obtained with significant adsorption performance of activated carbon .
  Microwave heating activated carbon , carbon-containing material itself as the heating element, and optionally heating the carbon-containing material , forming an ideal heating system is conducive to manufacturing and operation of the device , for example , no heating of the combustion apparatus containing carbon material , compared with conventional heating methods can increase the reaction rate , therefore , activation device can be miniaturized , easy operation , carbon loss, investment.
 1 . The process conditions for regeneration of activated carbon
 Experimental studies have shown that the activity of microwave regeneration of activated carbon with the following factors .
   Compared with the original activated carbon , activated carbon regenerated microwave performance of high density , abrasion loss is small.
  As the activation temperature, the adsorption capacity of activated carbon deposits . The frequency of 2.45GHz microwave at 800 ℃ temperature irradiation , gold adsorption capacity 22.67kgAut-1C, the original adsorption capacity of activated carbon 87% of gold . The frequency of 0.915 GHz microwave 750t, 8000C temperature irradiation , the regeneration has reached the original adsorption capacity of activated carbon deposits of 91% a
Regenerated activated carbon adsorption rate increases with temperature gold is accelerated and are subject to microwave frequencies. And 2.45GHz frequency compared with the frequency of the microwave activation 0.915GHz , regeneration of activated carbon adsorption rate of gold higher in the 750 `C and 800 ℃ temperature , using microwave activation 0.915GHz frequency regeneration of activated carbon gold the highest rate of adsorption .