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Activated carbon has a well-developed pore structure, which is divided into macropores, mesopores and micropores.
Micropore: less than 2nm, it is an important pore structure of activated carbon, which largely determines the size of its adsorption capacity.
Mesopore: also known as mesopore, with a radius of 2-50nm, which has a certain influence on the adsorption capacity and mainly functions as a coarse and fine adsorption channel.
Macropores: also known as coarse pores, pores with a radius greater than 50nm, its influence on the adsorption capacity can be ignored. Macropores play the role of adsorption channels in the adsorption process and act as a framework, and their proportion in the specific surface area is very small.
There are two main types of activated carbon:
1. Coal-based activated carbon is developed through a series of processes such as carbonization→cooling→activation→washing. Generally, it is made of powdery raw materials and binders through kneading, extrusion molding, and then carbonization and activation. It can also be extruded with powdered activated carbon and binder. It has the characteristics of developed pore structure, good adsorption performance, high mechanical strength, easy to regenerate repeatedly, and low cost. My company's main coal-based activated carbon.
2. Woody activated carbon is made of high-quality wood chips, wood blocks, coconut shells, fruit shells, etc., according to the national standard of woody activated carbon (GB/T13803.2-1999), using the more popular processes today: such as physical method, phosphoric acid method , Zinc chloride method for processing and production.
The types of raw materials for the production of coal-based activated carbon by our company: bituminous coal and anthracite.
(1) Weakly cohesive bituminous coal: Because of its good chemical activity and low ash content, it is widely used in the processing and manufacturing of raw coal crushed activated carbon.
(2) Anthracite: It is characterized by low ash, low sulfur, high carbon content, and good chemical activity. It is a high-quality raw material for producing high-grade activated carbon.
Coal-based activated carbon can be mainly divided into: columnar activated carbon, granular activated carbon, powdered activated carbon, spherical activated carbon
Activated carbon uses its adsorption characteristics and physical and chemical properties to adsorb, recover, refine and purify useful or useless components in various gas and liquid media:
The specification classification of activated carbon:
Cylindrical activated carbon: conventional particle size is divided into 1.5MM, 3.0MM, 4.0MM, 5.0MM, 6MM, 9.0MM.
Granular activated carbon: Activated carbon with a particle size greater than 0.175MM is usually called granular activated carbon, and the conventional particle size: 8-30 mesh, 8-16 mesh, 12-40 mesh, 30-60 mesh, 50-180 mesh.
Powdered activated carbon: Usually, 90% of the activated carbon that passes through the 80 mesh standard sieve or the particle size is less than 0.175MM is called powdered activated carbon, and the conventional particle size: 200 mesh, 325 mesh.
The performance of coal-based activated carbon is mainly determined by the following parameters:
1. Iodine value: the amount of iodine adsorbed by activated carbon per unit weight. Generally 600-1200mg/g
2. Butane value: the amount of butane adsorbed per unit weight of activated carbon.
3. Carbon tetrachloride (CTC%): The porosity of activated carbon is measured by adsorbing saturated carbon tetrachloride vapor. The general value is 30%-100%, this parameter is not applicable to powdered activated carbon.
4. Specific surface area: the sum of the inner surface and outer surface area per unit weight. The larger the specific surface area, the stronger the adsorption capacity.
5. Moisture: The moisture content in the activated carbon, the finished product generally has a moisture content of about 3%.
6. Ash content: Non-carbon impurities will block the pores of activated carbon and affect the adsorption effect. Generally, the ash content is required to be less than 15%.
7. Strength: The anti-wear and anti-compression index of activated carbon generally requires a strength higher than 95%.
8. Methylene blue: the amount of methylene blue solution adsorbed per gram of activated carbon. 80-200mg/g (can be converted into mg/ml by dividing 15)
9. Stacking weight: the weight of activated carbon per cubic meter of volume, the lower the weight, the larger the pores of activated carbon and the stronger the adsorption capacity.
Activated carbon has a well-developed pore structure, which is divided into macropores, mesopores and micropores.
Micropore: less than 2nm, it is an important pore structure of activated carbon, which largely determines the size of its adsorption capacity.
Mesopore: also known as mesopore, with a radius of 2-50nm, which has a certain influence on the adsorption capacity and mainly functions as a coarse and fine adsorption channel.
Macropores: also known as coarse pores, pores with a radius greater than 50nm, its influence on the adsorption capacity can be ignored. Macropores play the role of adsorption channels in the adsorption process and act as a framework, and their proportion in the specific surface area is very small.
There are two main types of activated carbon:
1. Coal-based activated carbon is developed through a series of processes such as carbonization→cooling→activation→washing. Generally, it is made of powdery raw materials and binders through kneading, extrusion molding, and then carbonization and activation. It can also be extruded with powdered activated carbon and binder. It has the characteristics of developed pore structure, good adsorption performance, high mechanical strength, easy to regenerate repeatedly, and low cost. My company's main coal-based activated carbon.
2. Woody activated carbon is made of high-quality wood chips, wood blocks, coconut shells, fruit shells, etc., according to the national standard of woody activated carbon (GB/T13803.2-1999), using the more popular processes today: such as physical method, phosphoric acid method , Zinc chloride method for processing and production.
The types of raw materials for the production of coal-based activated carbon by our company: bituminous coal and anthracite.
(1) Weakly cohesive bituminous coal: Because of its good chemical activity and low ash content, it is widely used in the processing and manufacturing of raw coal crushed activated carbon.
(2) Anthracite: It is characterized by low ash, low sulfur, high carbon content, and good chemical activity. It is a high-quality raw material for producing high-grade activated carbon.
Coal-based activated carbon can be mainly divided into: columnar activated carbon, granular activated carbon, powdered activated carbon, spherical activated carbon
Activated carbon uses its adsorption characteristics and physical and chemical properties to adsorb, recover, refine and purify useful or useless components in various gas and liquid media:
The specification classification of activated carbon:
Cylindrical activated carbon: conventional particle size is divided into 1.5MM, 3.0MM, 4.0MM, 5.0MM, 6MM, 9.0MM.
Granular activated carbon: Activated carbon with a particle size greater than 0.175MM is usually called granular activated carbon, and the conventional particle size: 8-30 mesh, 8-16 mesh, 12-40 mesh, 30-60 mesh, 50-180 mesh.
Powdered activated carbon: Usually, 90% of the activated carbon that passes through the 80 mesh standard sieve or the particle size is less than 0.175MM is called powdered activated carbon, and the conventional particle size: 200 mesh, 325 mesh.
The performance of coal-based activated carbon is mainly determined by the following parameters:
1. Iodine value: the amount of iodine adsorbed by activated carbon per unit weight. Generally 600-1200mg/g
2. Butane value: the amount of butane adsorbed per unit weight of activated carbon.
3. Carbon tetrachloride (CTC%): The porosity of activated carbon is measured by adsorbing saturated carbon tetrachloride vapor. The general value is 30%-100%, this parameter is not applicable to powdered activated carbon.
4. Specific surface area: the sum of the inner surface and outer surface area per unit weight. The larger the specific surface area, the stronger the adsorption capacity.
5. Moisture: The moisture content in the activated carbon, the finished product generally has a moisture content of about 3%.
6. Ash content: Non-carbon impurities will block the pores of activated carbon and affect the adsorption effect. Generally, the ash content is required to be less than 15%.
7. Strength: The anti-wear and anti-compression index of activated carbon generally requires a strength higher than 95%.
8. Methylene blue: the amount of methylene blue solution adsorbed per gram of activated carbon. 80-200mg/g (can be converted into mg/ml by dividing 15)
9. Stacking weight: the weight of activated carbon per cubic meter of volume, the lower the weight, the larger the pores of activated carbon and the stronger the adsorption capacity.
