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12-13 / 2017

Several types of activated carbon


Activated carbon is familiar, it is the appearance of a carbonaceous material was black, developed internal pore structure, large surface area, adsorption ability of a class of microcrystalline carbon materials. It is a commonly used adsorbent, catalyst or catalyst carrier, widely used in almost all sectors of the national economy and people's daily lives.

 Categories Activated Carbon - source of raw materials due to the manufacturing method, shape and appearance of different applications, no less than 1000 varieties of activated carbon.

 First, according to sources of raw materials can be divided into wood activated carbon (such as coconut shell activated carbon, apricot shell activated carbon, wood charcoal powder, etc.), the mineral raw materials of activated carbon (coal and oil and all kinds of processed products made from raw materials of activated carbon), other activated carbon raw materials (such as activated charcoal made of rubber, waste plastics, etc.).

Secondly, according to the manufacturing method can be divided into: Chemical Activated Carbon (carbon chemistry) and physical and chemical Activated Carbon - physical or physical - chemical Activated Carbon

Chemical Activated Carbon namely: the carbonaceous material mixed with certain chemicals, heat treatment, activated carbon preparation method called chemical method. Chemical production of activated carbon, also known as chemical or chemical activated carbon charcoal.

 The chemicals can be used as the chemical method is also called activators, activators zinc chloride, calcium chloride, potassium phosphate, potassium dihydrogen phosphate, potassium sulfide, potassium sulfate, potassium hydroxide, sodium hydroxide, boric acid, in short many acids, bases, salts can be used as an activator, mainly from the activated carbon performance and economy to consider what kind of activator.

 In general, chemical carbon pores secondary micropores, hole (hole diameter or hole that is wider than 1.5 nm pores) in the more developed, mainly used for liquid phase adsorption and solvent recovery refining gas (steam) adsorption occasions.

 Chemical manufacturing activated carbon due to the addition of chemicals in the manufacturing process should be attached great importance to the impact of possible traces of non-raw materials into elements and environmental protection products.

 I.e. activated carbon physical methods: charcoal as raw material with steam, carbon dioxide, air (mainly oxygen) or mixtures thereof (flue gas) is activated medium, at a high temperature (600 ~ 1000 ℃) preparing activated charcoal method called physical method. Physical method of manufacturing activated carbon physical law called activated carbon, also known as physical carbon.

 General physical char micropores (pore diameter or pore width of less than 1.5 nm pores) developed mainly for gas adsorption occasion or small molecule liquid phase adsorption applications.


Chemical - physical or physical - chemical Activated Carbon

 In understanding the chemical and physical carbon charcoal also should be mentioned that the chemical - physical or physical - chemical activated carbon. Use different combinations of different chemical and physical methods and the use of raw materials can regulate the pore structure of activated carbon, thereby preparing a number of different properties of activated carbon. This chemical - physical or physical - chemical method is a method of preparing activated carbon for many years in the future for a long time and the world is very concerned about the charcoal workers.

Again, by the appearance of the shape points

 Powdered activated carbon: generally more than 90% through 80 mesh sieve or particle size less than 0.175mm known as activated carbon powdered activated carbon or powdered charcoal. When using powdered carbon adsorption fast adsorption ability to use fully the advantages, but need a proprietary separation process. With the advent of technological advances and the separation of certain application requirements, charcoal powder particle size tends to have more and more refined, some occasions, even nanometer micron.

 Granular activated carbon: usually activated carbon particles larger than 0.175mm called granule activated carbon.

 Granule activated carbon is divided into the following categories:

 Unshaped granule activated carbon: unshaped granule activated carbon generally consists of granule-like material through carbonization, activation, and then crushing and screening to the desired particle size is made, you can also use powdered activated carbon addition of a suitable binder duly processed.

Cylindrical carbon: Activated carbon, also known cylindrical carbon column, generally by the powder material and a binder by kneading, extrusion and then by carbonization and activation processes made. You can also use powdered activated carbon plus binder extrusion. There are solid and hollow cylindrical carbon points, there is a hollow cylindrical carbon artificial or several regular holes columnar charcoal.

 Spherical activated carbon: name suggests is a spherical activated carbon spherical activated carbon, its preparation method is similar to cylindrical carbon, but the ball successful process. Can also be used by spray granulation liquid carbonaceous feedstock, oxidation, carbonization, activation is made, can also be processed using powdered activated carbon plus binder into a ball. Spherical activated carbon are also solid and hollow spherical activated carbon points.

 Other shapes of carbon: in addition to powdered activated carbon and granular activated carbon into two categories, there are other shapes, such as activated carbon fiber, activated carbon fiber blanket, activated carbon cloth, honeycomb activated charcoal, activated carbon plates and so on.

 Thirdly, by application points: Described before the activated carbon is widely used in almost all sectors of the national economy and people's daily lives, and as such, applications are classified according to the activated carbon is difficult, the problem is the same kind of activated carbon can be applied on many occasions, and in some occasions they can use a variety of activated carbon to achieve the same purpose. People tend to gain is by the application of activated carbon awareness, so often before words activated carbon activated carbon crown fuzzy classification given common law ××× activated carbon also act like. Such as sugar with activated carbon, activated carbon injection, MSG activated carbon, activated carbon water purification and so on.


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