Activated carbon is a kind of specially treated carbon, in which organic raw materials (fruit shells, coal, wood, etc.) are heated under air-isolated conditions to reduce the non-carbon components (a process known as carbonisation), and then reacted with gases, the surface of which is eroded to produce a microporous and well-developed structure (a process known as activation). Since the activation process is a microscopic process, i.e. the surface erosion of a large number of molecular carbons is point erosion, the result is an activated carbon surface with countless tiny pores. Most of the micropores on the surface of activated carbon have a diameter of between 2 and 50 nm, and even a small amount of activated carbon has a huge surface area of 500 to 1500 m2 per gram of activated carbon, and almost all applications of activated carbon are based on this feature of activated carbon.
Production process of activated carbon

1. Preparation of raw materials
Firstly, the raw materials need to be cleaned, screened and crushed to remove impurities and control the particle size. For hard raw materials such as wood, they need to go through the process of high temperature steaming and carbonisation to convert them into carbonaceous materials and remove water and impurities at the same time.
2. Chemical activation of activated carbon
Carbonaceous-based materials are put into a reactor, chemical activators (generally phosphoric acid and potassium acid) are added, and the reaction is carried out under high-temperature conditions to generate activated carbon benchmarks with large pore sizes and mesopore sizes. The reaction between the chemical activator and the carbon in this process continues for hours to tens of hours until the end point of the reaction is reached.
3. Temperature treatment and washing
The manufactured activated carbon is placed in a high temperature oven to reach a temperature of over 800°C to obtain a certain degree of hardness and stability, and at the same time to eliminate impurities and chemical activators left over from the reaction process. Then it enters the water washing stage, which is used to remove the impurities attached to the surface to ensure the quality and adsorption performance of the activated carbon.
4. Drying and sieving
After the water washing process, the activated carbon needs to be dried to remove water and remaining impurities. The activated carbon is then sorted and packaged according to different particle sizes through a sieving process.
The process of making activated carbon requires several steps and complex machinery and equipment, but it is the only way to create good quality activated carbon.
ctivated carbon has a wide range of application prospects in environmental protection, air purification, medical and health care, food industry, water treatment, etc. Therefore, the technology and research of activated carbon production will be a hot field and make greater contribution to the environmental protection cause.
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