1. Activated carbon produced by physical method can only be crushed and ground with natural activated carbon, but there is very little natural activated carbon. Natural carbon is mainly coal and graphite, but it does not have the activity to adsorb and separate substances.
2. Chemical activated carbon is made by heating and distilling organic matter (usually wood fiber materials) under the condition of isolating air. Generally, it has a loose texture, small specific gravity, large specific surface area, and good water absorption and adsorption. For example, gold is adsorbed from solution, the adsorption effect of coconut shell carbon…
The reason why chemical charcoal is more expensive than ordinary charcoal is activation and special treatment. The price of chemical activated carbon is higher than that of ordinary activated carbon. However, the raw material activity of this process is low, the activation time is long, the micropore size distribution is difficult to control, the quality of activated carbon is unstable, the specific surface area is low, and the development of mesoporous materials is insufficient, which limits its application.
The preparation process of physical activated carbon is slightly different from that of chemical activated carbon. During the activation process, chemical reagents such as zinc chloride are added to activate it. This is chemically activated carbon. Physically activated carbon is directly activated. Chemical methods do not involve changes in the molecular structure of a substance. Physical methods involve changes in matter, but the molecules of the matter remain the same.
The processes of physical activated carbon and chemical activated carbon are slightly different. In the activation process, chemical agents such as zinc chloride are added for activation. This is chemical activated carbon, while physical activated carbon is directly activated.
Production by physical steam method is generally divided into two processes. ..The first step is carbonization. The raw materials are dried at temperatures from 170 to 600 degrees, and 80% of the organic tissue is carbonized in the same amount. The second step is . The carbonized material enters the reactor in the first step, reacts with the activator and steam, completes the activation process, and makes the finished product. During the reaction process, CO and H2 gases are mainly produced, and the carbonized material is heated to the appropriate temperature (800-1000 degrees) to remove all decomposable substances, resulting in a rich pore structure and a huge specific surface area, making the activated carbon highly effective. Adsorption capacity. sex. Activated carbon produced from different raw materials has different pore sizes, among which coconut shell is the raw material. The pore size of activated carbon is smaller, the pore size of wood activated carbon is larger, and the pore size of coal activated carbon is somewhere in between.
Physical activated carbon is a porous carbonizing agent with rich pore structure and good adsorption performance. Its adsorption methods are physical adsorption and chemical adsorption, and its appearance is black. In addition to the carbon introduced by Shanxi activated carbon equipment manufacturer, it also contains small amounts of hydrogen, nitrogen and oxygen. Its structure resembles a hexagon. Due to its irregular hexagonal structure, it has the characteristics of orange three-leaf leaves and high specific surface area. The specific surface area of each gram of activated carbon is equivalent to 1,000 square meters.
