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Activated carbon preparation methods

August 25th, 2012 admin

traditional chemical method manufacturing activated carbon are the shortcomings of activating agent is used up

big, the recovery rate is low, produce water gas environmental harm. Along with the progress in technology, zinc

chloride method activated carbon production technology using rotary kiln two section method, the low temperature

activation, the zinc chloride consumption is extremely low. The method of phosphate production of activatedcarbon, phosphoric acid consumption in 20 !every tons of activated carbon acid consumption" the following,

production environment clean. The phosphate low consumption can not only greatly reduce the production cost, the

main protection of the environment, realize the clean production.

tools#raw material

intermittent operation

di$erent size of the barrel, cylinder, tank containers, such as %lter, mixer, etc. &ilter have common %lter,

vacuum %lter or pressure %ltration

continuous operation

%xed bed, moving bed, 'ow bed

method#steps

raw material pretreatment. Activated carbon the pretreatment of the raw material including deliming and

preoxidation. Activated carbon production raw material for wood, coal and other natural product, all contain a

certain amount of impurities, such as (i, Al, )a, *g and other elements, these components on active preparation

process are very sensitive to prevent micro hole formation action through the raw material deliming pretreatment, it

can remarkably improve the performance of activated carbon. +aw material preoxidation treatment usually have a

dry and wet two methods for dry in a certain heating conditions, the use of air, gas, such as oxygen as oxidant, wet

law commonly used nitric acid and sulfuric acid as the oxidizing agent, etc. (tudies show that oxidation

pretreatment can obtain coal activated carbon speci%c surface area of 000 m2#g, iodine adsorption value -00

mg#g, methylene blue adsorption value 00 mg#g, phenol adsorption value 20 mg#g performance, for wood

activated carbon adsorption of methylene blue value can be up to /0 mg#g.

using catalytic activator. 1hen using physical activation for preparation of super activated carbon, add catalyst

for catalytic activation can be multiple to improve the reaction rate, reduce activation temperature, concentration

and pore size distribution. &or example, domestic patent based on calcium catalytic physical activation method, )

324 reaction activation energy from -5 k6#mol reduced to -7 8 -9 k6#mol, aperture focus on 8 -0 nm.

:apanese patents of the transition metal elements as catalyst, not only reduce the reaction time, and get speci%c

surface area reached 200 8 000 m2#g super activated carbon, representative transition metal compounds have

&e2 !;4" , &e !43" , &e ?se templates. @n the inorganic template in small space !nanoscale" into organic polymer and make its

carbonized, then use acid will template melt can be made after with inorganic template space structure similar

porous carbon materials, this method can be made narrow pore size distribution, choosing absorbing high

mesopore activated carbon. The ?nited (tates, :apan has the silicon gel particles !/ 8 -7/ m, specific surfacearea of 7/0 m2, aperture 7./ nm" as template, make speci%c surface area --00 8 2000 m2#g, aperture for - 8 -0

nm, and focus on 2 nm narrow pore size distribution of activated carbon material. ?sing template for preparation of

activated carbon advantage is by changing the template method to control the activated carbon hole distribution,

but this method are the shortcomings of complex preparation technology need acid remove templates, make cost

increase.

note

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> @n coal Buality raw materials, for example, the domestic and international research adopt new

grinding technology in combination with chemical washing method, may obtain ash for - of cleaned coal,

but the relatively high cost. Activation of raw materials before proper oxidation treatment, can improve the

activated carbon adsorption properties and yield. +aw material preoxidation on activation process there

are two more clear advantagesC one is to reduce activation temperature and shorten activation time. The

second is through the raw materials preoxidation increased after raw material surface activity, making the

activation more easily into the raw material grain internal. Dxperience content is only for reference, if youneed to solve the speci%c problems !especially in legal, medical, etc", suggest you next detailed

consultation related %elds professionals.