The used activated carbon can be regenerated and reused reasonably.
Activated carbon regeneration is the reactivation of fully adsorbed activated
carbon after treatment under certain conditions.
1. Introduction:
The so-called activated carbon regeneration actually refers to the operation
and method of bringing changes in the external environment of activated carbon
through external stimulation, so as to reactivate the active components and
achieve the purpose of reuse. With the wide attention of the activated carbon
industry and the development in the market, activated carbon has been applied in
various fields of life.
2. Method:
Heating regeneration method: the regeneration process of used activated
carbon is generally divided into three stages: drying, high-temperature
carbonization and activation according to the changes of organic matter when
heated to different temperatures. In the drying stage, the volatile components
on the activated carbon are mainly removed. The high-temperature carbonization
stage is to make part of the organic matter adsorbed on the activated carbon
boil, vaporize and desorb, part of the organic matter undergo decomposition
reaction, generate small molecular hydrocarbons and desorb, and the residual
components remain in the pores of the activated carbon to become "fixed
carbon".
At this stage, the temperature will reach 800 ~ 900 ° C. in order to avoid
the oxidation of activated carbon, it is generally carried out under vacuum or
inert atmosphere. In the next activation stage, gases such as CO2, Co, H2 or
steam are introduced into the reactor to clean the micropores of activated
carbon and restore its adsorption performance. The activation stage is the key
of the whole regeneration process. Although the thermal regeneration method has
the characteristics of high regeneration efficiency and wide application range,
it needs additional energy heating in the regeneration process, and the
investment and operation cost are high.
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