Discussion on the composition of activated carbon and its research conclusions

Discussion on the composition of activated carbon and its research conclusions

In our company's activated carbon production line, the activation furnace is produced using the most stable and high-yield equipment, the Slep furnace. Since this furnace type requires the raw material particle size to be between 1-10mm, about 5-10% of fine powder is produced when the raw material is crushed, and our company will produce about 50 tons of carbonized powder every month. It turned out to be used only as fuel.

Activated carbon overview

Water treatment series activated carbon is the leading product of our company. This product is selected from the world's most abundant and high-quality activated carbon resource production areas - Indonesia, the Philippines and other Southeast Asian countries, activated carbon raw materials, carbonized, high-temperature steam activation, refined products and other processes.

Key Issues in the Application of Activated Carbon Adsorption Technology Jin Wei, Li Huaizheng, Fan Weichu Abstract: Activated carbon adsorption technology is an effective measure to improve water quality in water plants. It has flexible operation mode, low cost and obvious effect. Through comprehensive research results, the problems that activated carbon adsorption technology should focus on in the application of water plants are discussed. Keywords: activated carbon, water, organic matter.

Activated carbon is a charcoal having a developed pore structure and a large specific surface area and adsorption capacity. The total surface area per gram of activated carbon can reach more than 1500 square meters.

There are many kinds of activated carbon, which can be divided into plant raw material activated carbon, coal-based activated carbon, petroleum activated carbon, bone charcoal, charcoal, etc. according to different raw materials; according to the manufacturing method, it can be divided into activated carbon by gas activation method, that is, activated carbon by physical activation; chemical activation method Activated carbon, that is, chemical activated carbon; chemical-physical activated carbon; according to the shape of the shape can be divided into powdered activated carbon, amorphous granular activated carbon, shaped granular activated carbon, spherical activated carbon, fibrous activated carbon, fabric-like activated carbon, etc.; It is divided into gas phase adsorption activated carbon, liquid phase adsorption activated carbon, sugar activated carbon, industrial activated carbon, catalyst and catalyst carrier activated carbon.

Activated carbon has adsorption and catalytic properties, it is insoluble in water and other solvents, and has physical and chemical stability. In addition to high temperature contact with oxygen, with strong oxidants such as ozone, chlorine, dichromate, etc., it is extremely stable under actual use conditions. Due to the excellent properties of activated carbon as an adsorbent, activated carbon is widely used.

Activated carbon characteristics

Activated carbon is currently recognized as the best quality activated carbon in the activated carbon industry.

It has a developed specific surface area, abundant pore structure and extremely low ash, and has unmatched high strength of other materials.

It is most commonly used in some places where high strength and adsorption are required. Such as the extraction of gold with activated carbon, high-demand water purification industry, catalyst carrier industry and so on.

Activated carbon At the beginning of this year, the plate furnace designed by our company was officially put into use. After trial production, the decolorization power of methylene blue produced by the activated carbon index reached more than 12ML, and the impurity index was controlled stably. It can completely produce products such as water treatment and activated carbon for edible oil decolorization. The commissioning of this type of furnace can greatly reduce the cost of our company's powdered activated carbon and greatly enhance the competitiveness of the company's products.

The clean water series activated carbon is the leading product of our company. This product is selected from the world's most abundant and high-quality activated carbon resource production areas - Indonesia, the Philippines and other Southeast Asian countries, activated carbon raw materials, carbonized, high-temperature steam activation, refined products and other processes.

Activated carbon characteristics

Activated carbon is currently recognized as the best quality activated carbon in the activated carbon industry.

It has a developed specific surface area, abundant pore structure and extremely low ash, and has unmatched high strength of other materials.

It is most commonly used in some places where high strength and adsorption are required. Such as the extraction of gold with activated carbon, high-demand water purification industry, catalyst carrier industry and so on.

The evaluation of activated carbon in liquid phase adsorption, such as: iodine adsorption value, methylene blue adsorption value, phenol value and other international and domestic methods, focused on the determination of tannic acid value and its significance.

Elemental composition of activated carbon

In terms of elemental composition, 80%-90% of activated carbon is composed of carbon, which is also the reason why activated carbon is a hydrophobic adsorbent. In addition to I carbon, activated carbon also contains two types of blends: one is a chemically bonded element, mainly oxygen and hydrogen, which are left in charcoal due to incomplete carbonization, or during activation. The foreign non-carbon element is chemically combined with the surface of the activated carbon. When activated by steam, the surface of the activated carbon is oxidized or steam oxidized; the other type of ash is ash, which is the inorganic part of activated carbon, and the elemental composition of several activated carbons. . Activated carbon experts can see that activated carbon also contains a small amount of hydrogen and oxygen, and zinc chloride activated carbon contains a small amount of CI.

The raw materials of activated carbon are very rich, such as coal, shell, rice husk, petroleum coke, resin, asphalt, used tires and so on. Among them, the shell-shell raw materials have a wide range of sources, low cost, and have a high-quality natural structure, which is conducive to the formation of a developed microporous structure, which has received more and more attention. The preparation methods of activated carbon are mainly divided into two categories: chemical activation method and physical activation method. Chemical activation is a series of cross-linking or polycondensation reactions with carbon materials through chemical reagents such as KOH, Zncl2, etc., to create rich micropores; physical activation is the use of air, carbon dioxide, water vapor and other oxidizing gases at high temperatures and carbon The carbon atoms react in the material. Chemical activation has the advantages of short activation time and low activation temperature. However, the use of a large number of chemical reagents increases the preparation cost, and has a strong corrosive effect on the equipment at a high temperature, and requires a large amount of water in the washing process, and these wastewaters can meet the environmental discharge requirements after a complicated treatment process. For this reason, at present, most of the industry uses steam activation to prepare activated carbon.

Activated carbon is a carbonaceous adsorbent with rich void structure and large specific surface area. It has strong adsorption capacity, good chemical stability, high mechanical strength and convenient regeneration. It is widely used in industry, agriculture, national defense, In the fields of transportation, medical and health, environmental protection, etc., with the increasing demand for environmental protection, the demand for activated carbon at home and abroad is increasing, increasing year by year.

Activated carbon has various names depending on its appearance, manufacturing method, and use. Classified from the shape of the appearance, some common names of activated carbon, the currently used activated carbon, which was developed in the early 20th century, is still in use today, and the innovative invention in manufacturing is activated by strong alkali. The method of manufacturing activated carbon with high specific surface area has also been carried out in various applications. The activated carbon is expensive to manufacture and cannot be mass produced.

Activated carbon is made of different materials. Generally, activated carbon made from coal is usually activated by water vapor or carbon dioxide gas. The shape of the product is mainly granular, and its pore size distribution is mostly microporous, which is more suitable for adsorption liquid. In the phase and gas phase, the molecular weight and molecular diameter are small, and the adsorption performance index is usually expressed by methylene blue adsorption value and iodine adsorption value;

Activated carbon made from wood chips is usually activated by chemical method. The shape of the product is mainly powder. The pore size distribution can be controlled by adjusting the ratio of chemical activator. It is flexible and can produce pore size distribution with micropores. Most of the products can also produce a larger proportion of pores (transition pores) in the pore size distribution, while the latter is more suitable for the adsorption performance index of substances with larger molecular weight and molecular diameter in the adsorption liquid phase, expressed by caramel decolorization rate;

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