Rotary Kiln

Activated carbon is a carbonaceous material that has been specially treated to enhance its adsorption performance. It is widely used in water treatment, air purification, industrial decolorization, medicine and food processing and other fields. Its notable feature is its extremely high specific surface area, usually between 500 and 1500 square meters/g, which enables activated carbon to effectively adsorb a variety of organic and inorganic pollutants. For example, the specific surface area of ​​common activated carbon can reach 1000 square meters/g, or even higher, depending on its production process and raw materials.

The porous structure of activated carbon is the key to its high adsorption capacity. The pore sizes are widely distributed, including micropores (<2 nanometers), mesopores (2-50 nanometers) and macropores (>50 nanometers), and can capture molecules of different sizes. In addition, the surface of activated carbon can be chemically modified, such as oxidation or amination, to further improve its selective adsorption properties.

The operation of activated carbon rotary kiln has strict requirements on environmental conditions. The first priority is to ensure that the rotary kiln operates in an environment with excellent ventilation performance to ensure efficient exhaust gas emissions and prevent the accumulation of harmful gases. The ambient temperature should also be stable within the range of -20°C to 50°C. This temperature range is not only beneficial to the smooth operation of the equipment, but also can alleviate the stress of the kiln body material caused by temperature differences.

Operators need to regularly review parameters such as temperature, pressure and gas composition to maintain smooth operation of the equipment. For example, the temperature in the kiln should usually be controlled in the range of 800°C to 1100°C, and the contents of gas components such as CO, CO2 and O2 should be tracked in real time through an online monitoring system. Through the implementation of precise environmental control and operating codes, not only can the production volume and quality of activated carbon be significantly improved.

The rotary kiln significantly enhances the adsorption performance of activated carbon through precise temperature control. At high temperatures of 800°C to 1000°C, calcined activated carbon effectively removes impurities and volatile substances. This process not only purifies the carbon material, but also promotes the formation of rich microporous structures, thereby greatly increasing its specific surface area. The specific surface area of ​​treated activated carbon can be increased to more than 1,200 square meters/g, which is about 30% higher than that of untreated activated carbon.
The rotary kiln further finely regulates the formation of microporous structure by regulating gas composition, such as reducing oxygen concentration to prevent excessive oxidation. These micropores are crucial for the adsorption of gas and liquid molecules, so activated carbon treated with a rotary kiln has excellent adsorption properties.

The quality of activated carbon is usually measured by several key indicators, the most important of which include specific surface area, iodine adsorption value, ash content and moisture content. Specific surface area is the main parameter to evaluate the adsorption capacity of activated carbon. The specific surface area of ​​high-quality activated carbon is generally between 900 and 1200 square meters/g. The iodine adsorption value reflects the microporous structure of activated carbon, which is generally required to be above 950 mg/g, and high-quality products can even reach above 1200 mg/g.

Ash content affects the purity of activated carbon. Generally, the ash content of high-quality activated carbon should be less than 5%. Moisture content directly affects the use efficiency and storage stability of activated carbon, and is usually required to be below 10% to ensure the performance and service life of the product.

These indicators directly determine the quality and application effect of activated carbon. Activated carbon that meets high standards can play a more significant role in the fields of water treatment, air purification and chemical industry.

The adsorption capacity of activated carbon is mainly evaluated through specific surface area measurement and iodine value test. Specific surface area is a key indicator of the adsorption capacity of activated carbon, usually expressed in square meters per gram (m²/g). The specific surface area of ​​high-quality activated carbon is usually between 1000 and 1500 m²/g, which means that it has a large number of micropores and a large surface area, and can adsorb a large number of pollutants.

The iodine value test is another commonly used evaluation method, which refers to the number of milligrams of iodine that can be adsorbed per gram of activated carbon. The higher the iodine value, the stronger the adsorption capacity of activated carbon. The iodine value of high-quality activated carbon is usually between 900-1100 mg/g, indicating its high efficiency in applications such as water treatment and air purification. Under these conditions, the adsorption efficiency of activated carbon can usually reach more than 90%, and it is widely used to remove organic matter, gases and heavy metals to ensure purification effects.

The service life of activated carbon can be extended through regular regeneration and maintenance. Activated carbon will gradually become saturated during the adsorption process, resulting in a decrease in its adsorption performance. In order to restore its adsorption capacity, it can be treated by thermal regeneration, chemical regeneration or steam regeneration. Thermal regeneration is one of the most commonly used regeneration methods.

The activated carbon is heated to high temperatures (usually between 700°C and 1000°C) to remove adsorbed organic matter and restore the pore structure on its surface. In addition, keeping activated carbon used and stored in a suitable environment and avoiding exposure to excessive moisture and pollutants can also effectively extend its life.