Activated carbon is a carbon product with high-quality anthracite, quartz sand, charcoal or various kinds of shells as raw materials, processed by special processes through physical or chemical methods, and has a developed pore structure and specific surface area. The structure makes it have strong adsorption capacity, so it is widely used in industrial and civil fields such as air purification, anti-virus protection, water treatment, solvent decolorization.
In recent years, with the gradual understanding of activated carbon, the activated carbon market has also developed rapidly. However, at the same time of development, various inferior activated carbon products have also entered the market, seriously affecting the normal development of the activated carbon market and causing consumers Bad consequences. In order to allow consumers to choose products that are safe, here is a brief explanation on how to choose high-quality activated carbon. Although activated carbon can have many varieties in terms of appearance and use, activated carbon has a common characteristic, that is, "adsorption".
The reason why activated carbon produces adsorption is because it has a developed pore structure. Like the sponge we see, under the same weight conditions, the sponge can absorb more water than other objects, because it is developed. Pore ​​Structure. However, this pore structure of activated carbon is invisible to the naked eye because they are only between 1 x 10-12 mm and 10-5 mm, which is not much larger than a molecule. The degree of development of activated carbon pores is unimaginable. If 1 gram of activated carbon is taken, all the pore walls inside will be expanded into a plane, and the area will reach 1000 square meters (the specific surface area is 1000g/m2)!
[The performance indicators of activated carbon products can be divided into:]
Physical performance indicators, chemical performance indicators, adsorption performance indicators.
Three performance indicators play a very important role in the selection and application of activated carbon. The main physical performance indicators are: shape, appearance, specific surface area, pore volume, specific gravity, mesh number, particle size, wear resistance, and floating rate. The main chemical performance indicators are: PH value, ash, moisture, ignition point, uncarbide, sulfide, chloride, cyanide, sulfate, acid soluble, alcohol soluble, iron content, zinc content, lead content, arsenic content, Calcium and magnesium content, heavy metal content, phosphate, etc. The main adsorption performance indicators are: methylene blue adsorption value, iodine adsorption value, phenol adsorption value, carbon tetrachloride adsorption value, caramel adsorption value, quinine sulfate adsorption value, saturated sulfur capacity, sulfur penetration capacity, water capacity, Ethyl chloride vapor protection time, ABS value, etc.
[Introduction of powdered activated carbon filtration decolorization analysis]
Powdered activated carbon used in filtration and decolorization. There are many ways to decolorize powdered activated carbon. It should be flexibly controlled according to the properties of the material. For example, the powdered activated carbon is administered in one shot or in batches according to the total amount of powdered activated carbon required. At present, the more common method is the two-stage method, that is, the powdered activated carbon which has been used once decolorized is newly used in a solution having an important pigment load, and then de-colored by applying new carbon, and the used carbon is reused for crude decolorization. Some solutions are concentrated by evaporation after decolorization, and are decolorized before and after evaporation. Decolorization using powdered charcoal is mostly intermittent operation. After mixing the charcoal with water, it is pumped to the decolorizing tank. The decolored solution is filtered through various types of filters, and the filter cake is washed. For continuous decolorization, a granular activated carbon is used to fill the decolorizer. There are multiple towers in series, continuous decolorization, and step regeneration. Many factories use a two-step method, that is, when the pigment load is large and the solution impurities are large, the powder is decolorized first, and the filtrate is decolorized by granular carbon. Powdered activated carbon is generally used for filtration and decolorization in its application. Filtration is the simplest and most common method of using a porous substance (sieve plate or filter membrane, etc.) to block large particulate matter and pass less than pore material. Separation method. Mainly used for the separation of suspensions.
At present, there are many varieties of water-treated activated carbon. There are tricks for finding high-quality activated carbon. Only considering its iodine value and methylene blue value are not enough. They can only indicate the specific surface area of ​​fine pores in activated carbon particles, but in practice. There is a problem of adsorption rate in production, that is, the adsorption time in the water purification process is limited, and the powdered activated carbon used in the water treatment is far from reaching the complete adsorption equilibrium. The medium pores inside the activated carbon particles are the entry channels of organic molecules. It is generally believed that the more developed the medium pores of activated carbon, the more favorable the adsorption kinetic equilibrium, so whether the mesopores are developed determines the adsorption rate. In order to combine practical applications, we not only consider the total adsorption specific surface area of ​​powdered activated carbon (ie, iodine value, methylene blue value, etc.), but also determine whether the pore size distribution inside the powdered activated carbon particles is easy to achieve rapid adsorption, that is, how to clearly convert Evaluate whether the pore size distribution of activated carbon is reasonable
[Use and processing technology of coal columnar activated carbon]
Coal columnar activated carbon
a It can be used for advanced purification of urban drinking water, removing residual chlorine and deodorization; b is also a high-grade purification material in the production process of high-purity water and artificial mineral water; c large-scale boiler feed water removes harmful impurities such as COD in advance, which can improve boiler efficiency and Extend the life of the boiler; d can effectively remove the poisonous substances such as COD, pigment and odor in the water. e Large granular activated carbon can be used to fill filters and purify air. 1. Coal-based activated carbon for gas purification (unshaped broken/cylinder): used to remove pollutants from the air. Chemical raw material gas, chemical synthesis gas, pharmaceutical industry gas, carbon dioxide gas and hydrogen for beverage, purification of nitrogen, chlorine, hydrogen chloride, ozone, ethylene, ethane, butane, cracked gas, inert gas, etc. Purification.
2. Coal-based activated carbon for purification of water (unshaped crushed/cylinder): It is refined from selected high-quality bituminous coal, with large adsorption capacity and wide adsorption range. This series of products can further remove organic matter and color in water, mainly based on activated carbon adsorption and filtration, and regenerated by water washing. Mainly used for deep purification treatment of various industrial sewage.
3. Coal-based activated carbon for recovery solvent: The transition pore structure is developed, the specific surface area is large, the adsorption speed is fast, and it is easy to regenerate. It is mainly used for benzene, toluene, xylene, ether, alcohol, gasoline, chloroform, tetrachloromethane, Recovery of organic solvents such as acetone and recovery of hydrocarbon vapors
The coal-based columnar activated carbon is developed through a series of complicated processes such as carbonization, cooling, activation and washing, and has extremely high use value.
Coal-based activated carbon is made of high-quality coal as raw material, and is developed through a series of processes such as carbonization, cooling, activation and washing. Its appearance is generally black cylindrical activated carbon, amorphous coal granular activated carbon, also known as broken carbon. Cylindrical activated carbon, also called columnar carbon, is generally prepared by mixing, extruding, and then carbonizing and activating a powdery raw material and a binder. It can also be extruded with powdered activated carbon and a binder. It has developed pore structure, good adsorption performance, high mechanical strength, easy repeated regeneration and low cost. It is used for purification of toxic gases, waste gas treatment, purification of industrial and domestic water, and solvent recovery.
Coal columnar activated carbon
a It can be used for advanced purification of drinking water in cities, removing residual chlorine and deodorizing;
b is also a high-grade purification material in the production process of high-purity water and artificial mineral water;
c Large-scale boiler feed water removes harmful impurities such as COD in advance, which can improve boiler efficiency and extend boiler life;
d It can effectively remove toxic substances such as COD, pigment and odor in water.
e Large granular activated carbon can be used to fill filters and purify air.
Coal columnar activated carbon:
It can be used for advanced purification of urban drinking water, removing residual chlorine and deodorizing; it is also an advanced purification material in the production process of high-purity water and artificial mineral water; large-scale boiler feed water removes harmful impurities such as COD in advance, which can improve boiler efficiency and extend boiler life. It can effectively remove toxic substances such as COD, pigments and odors in water. Large granular activated carbon can be used to fill filters and purify air.
Coal-based columnar activated carbon activated carbon is a very good adsorbent. It uses charcoal, bamboo charcoal, various shells and high-quality coal as raw materials to crush, sift, catalyst, and rinse raw materials through physical and chemical methods. It is made by a series of processes such as drying and screening. It has the dual characteristics of physical adsorption and chemical adsorption. It can selectively adsorb the gas phase and various substances in the liquid phase to achieve decolorization, purification, deodorization and decontamination. Purification and other purposes. The inspection standard can be in accordance with the Chinese national standard. The use of powdered activated carbon in China is as follows: used for medicine accounted for 59.8% for oral glucose accounted for 26.6% for food industry accounted for 10.8% for other aspects accounted for 2.8% of China's granular activated carbon use The situation is as follows: 51.2% for synthetic fiber carrier, 13.0% for polyvinyl chloride carrier, 23.5% for water purification, 7.7% for synthetic desulfurization, 4.6% for others, Wenxian Henan Water Purification Material Factory One of the largest domestic activated carbon manufacturers, providing activated carbon selection, activated carbon regeneration, activated carbon recovery and other services. Its leading products - solvent recovery activated carbon, carrier activated carbon, coconut shell activated carbon, wood
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