Analysis of the industry development of powdered activated carbon

With the development of food, medicine, light industry, environmental protection, etc., powdered activated carbon as an adsorption decolorizing agent, its dosage is increasing rapidly. In the early days of the founding of the People's Republic of China, the annual output of activated carbon was only over 30 tons. By 1996, there were more than 200 manufacturers in the country, with an annual output of 130,000 tons.

According to the use of activated carbon, it can be made into powder and granular, granular activated carbon is divided into shaped carbon (for example: columnar, spherical, etc.) and non-shaped; according to the different activators used in production, it can be divided into physical activated carbon. And chemical activated carbon: According to different production materials, it can be divided into wood charcoal and coal charcoal. Because of the large porosity of wood materials, the internal cell tissue has many natural pores (the specific surface area of charcoal is easy to enter the activator, and the touch reaction surface Big easy to live, and coal is different (coal coke has a specific surface area only so that the reaction surface with activator is much smaller than charcoal. In short, the decolorization function of chemical wood powdered activated carbon is better, it is hydrolyzed, Fermentation, organic synthesis, sugar production, pharmaceutical, water and environmental protection, etc., used to remove color bodies, gums, adsorption of odor, prevent liquid turbidity, remove foam, increase evaporation crystallization rate.

Production method of wood powdered activated carbon

The old-fashioned process of chemical activated carbon is zinc chloride. Most domestic activated carbon manufacturers choose this method. The activation principle is: zinc chloride has dehydration effect in carbonization activation, and hydrogen and oxygen are used in the woody quality. The form escapes, so that the carbonization activation temperature can be lowered, and the pyrolysis path can be changed. Other zinc chloride solutions have a dissolution and corrosion effect on the wood material, so that it can smoothly penetrate into the interior of the material and reach the pores formed by the woody fiber. After the complete activation, the zinc chloride is mostly left in the carbon to form a skeleton effect during the activation process, and the carbon formed is deposited on the skeleton. After the zinc chloride is washed away by water, the wood powdered activated carbon is porous, and then It has adsorption and decolorization effects.