Coal columnar coal columnar activated carbon is a porous carbonaceous material, which has highly developed pore structure and is an excellent adsorbent. The adsorption area per gram of coal columnar coal columnar activated carbon is more than eight tennis courts Its adsorption is achieved by physical adsorption and chemical adsorption In addition to carbon element, its composition also contains a small amount of hydrogen, nitrogen, oxygen and ash, and its structure is formed by the accumulation of six rings of carbon. The irregular arrangement of six ring carbon results in the characteristics of multi micropore volume and high surface area of coal columnar activated carbon.
Coal columnar coal columnar activated carbon can be made from many kinds of carbonaceous materials, including wood, sawdust, coal, coke, peat, lignin, nut core, hard nut shell, sucrose pulp, bone, lignite, petroleum residue, etc. Among them, coal and coconut shell have become the commonly used raw materials for manufacturing coal columnar coal columnar activated carbon. The manufacturing of coal based columnar activated carbon is basically divided into two processes. The first process includes dehydration and carbonization, heating the raw materials, drying at 170 to 600 ℃, and carbonizing about 80% of the original agricultural production system. The second process is to activate the carbonization, which is completed by using an activator, such as water vapor, to react with carbon. In the endothermic reaction, a mixed gas composed of CO and H2 is mainly generated, which is used to burn and heat the carbonization to an appropriate temperature (800 to 1000 ℃), so as to burn out all the decomposable substances in it, thus producing a developed microporous structure and huge specific surface area, Therefore, it has strong adsorption capacity.
The pores of coal columnar activated carbon can be divided into three types according to the pore size. Large hole: radius 1000 - 1000000 A. Transition hole: radius 20 - 1000 A. Micropore: radius - 20 A.
The coal columnar activated carbon made from different raw materials has different pore sizes. The coal columnar activated carbon made from coconut shell has smaller pore radius. Wood coal columnar coal columnar activated carbon generally has a large pore radius. They are used to adsorb larger molecules and are almost exclusively used in the liquid phase. The first type of granular coal columnar coal columnar activated carbon used in the field of urban water supply treatment is made of wood, called charcoal. The pore size of columnar activated carbon from coal is between the two.
Among the coal based columnar coal based columnar activated carbon, the lignite based columnar coal based columnar activated carbon has more transition pores and larger average pore size than the anthracite based columnar coal based columnar activated carbon, so it can effectively remove macromolecular agricultural production systems in water. The surface area of coal columnar activated carbon commonly used in water treatment may not be too large, but it should have more transition pores and larger average pore size. Some liquid phase coal columnar activated carbons sold in Japan have the following characteristics: specific surface area of 850 to 1000m2/g, pore volume of 0.88 to 1.5ml/g, and average pore radius of 40 to 50A.
In the production process, the way to improve the adsorption performance of coal based columnar activated carbon is to control the production process and increase the pore structure of coal based columnar activated carbon as much as possible in unit volume. Therefore, the density of coal based columnar activated carbon with higher adsorption becomes smaller and smaller because it contains a large number of pores, which is why the coal based columnar activated carbon with better adsorption has a lighter feel (provided that it is produced with the same raw material and has not been soaked in water or adsorbed other Substance). At the same time, with the improvement of adsorption, the production cost of coal based columnar activated carbon will be higher, and it will increase geometrically. That is to say, low adsorption coal based columnar activated carbon can be used in the market as high adsorption coal based columnar activated carbon pin Motivation to sell.
In order to unify the standard and make production controllable, the adsorption value of coal based columnar activated carbon is usually calibrated by iodine adsorption value or carbon tetrachloride adsorption value (CTC) in the coal based columnar activated carbon industry. The higher the adsorption value, the stronger the adsorption capacity of coal based columnar activated carbon.
Knowing the above points, it is not difficult to judge the performance of coal based columnar activated carbon. The higher the adsorption value, the better the performance of coal based columnar activated carbon. Then in the absence of Testing equipment How to simply identify the adsorption value of coal columnar activated carbon? Here are some easy methods for reference.
1. Look directly at the indicators provided by the manufacturer. Common adsorption indexes of coal based columnar activated carbon mainly include: iodine adsorption value, carbon tetrachloride (CTC) adsorption value, methylene blue adsorption value. Iodine adsorption value is used to indicate the adsorption capacity of coal based columnar activated carbon for liquid substances, and carbon tetrachloride adsorption value is used to indicate the adsorption capacity of coal based columnar activated carbon for gaseous substances, Methylene blue adsorption value is used to indicate the decolorization capacity of coal based columnar activated carbon. The higher these three indicators are, the stronger the adsorption capacity of coal based columnar activated carbon is. Therefore, when purchasing the coal based columnar activated carbon, you can select the coal based columnar activated carbon suitable for your own use according to your own use and the indicators provided by the manufacturer.
2. See the volume: why is the volume of original coal columnar activated carbon larger than that of other companies? As mentioned above, in order to improve the adsorption performance of coal based columnar activated carbon, we must make as many pore structures as possible on the coal based columnar activated carbon. The more pores, the looser the coal based columnar activated carbon is, and the lighter the relative density will be. Therefore, good coal based columnar activated carbon will feel lighter. Under the condition of the same weight packaging, The volume of columnar activated carbon from good coal is much larger than that from poor coal.
3. Look at bubbles. Put a small handful of coal based columnar activated carbon into water. Due to the permeation of water, the water will gradually immerse into the pore structure of coal based columnar activated carbon, forcing the air in the pores to be discharged, thus generating a series of extremely small bubbles. Pull out a small bubble line in the water, and at the same time, it will emit a faint bubble sound, which is very interesting. The more intense this phenomenon occurs and the longer it lasts, the better the adsorbability of coal based columnar activated carbon will be.
4. See decolorization ability. Another manifestation of the adsorption capacity of coal based columnar activated carbon is its decolorization capacity. Coal based columnar activated carbon has the advantage of being able to turn colored liquid into light color or colorless, which is actually caused by the reason that coal based columnar activated carbon absorbs pigment molecules in colored liquid. Because of this characteristic of coal based columnar activated carbon, it is widely used in the production process of brown sugar to white sugar in the sugar industry. Take two transparent cup Put pure water into a cup, and then drop a drop of red ink (any pigment that is easy to observe but does not change the nature of the water can be used here, such as blue ink, printer color ink, but ink and carbon ink cannot be used). After mixing evenly, pour half of the colored water into another cup for comparison. Put the coal based columnar activated carbon into colored water, and the amount should reach half or more of the water, so the effect will be more obvious. After standing for 10-20 minutes, compare with the reference water sample. Under the same conditions, the stronger the decolorization effect, the better the adsorption of coal based columnar activated carbon.
The following points should also be paid attention to when purchasing coal based columnar activated carbon:
1. The coal columnar activated carbon is better packaged in a sealed manner. Because the air is more or less permeated with various macromolecular substances of agricultural production system, especially the concentration of phenolic substances in newly decorated stores or storage cabinets at home is relatively high, these substances will be adsorbed by coal based columnar activated carbon. Over time, the adsorption performance of coal based columnar activated carbon will be reduced or even unavailable due to the adsorption of these substances. Therefore, the higher the adsorption value of coal based columnar activated carbon, the more sealed packaging should be used to prevent the performance of coal based columnar activated carbon from being interfered by the outside.
2. Some of the fake coal columnar activated carbon on the market now is passed off as "carbonized material", a semi-finished product of coal columnar activated carbon. The carbonized material can become a real coal columnar activated carbon only after the "activation" process, which is the more important process of manufacturing pore structure in the manufacturing process of coal columnar activated carbon. The carbonized materials without this process can be said to have almost no adsorption performance, which has hurt consumers. The carbonized material has no activation pore forming process, so its surface is smoother than that of coal based columnar activated carbon, and its color is white, slightly metallic luster, and its hand feel is harder than that of coal based columnar activated carbon, and its weight is much heavier. A considerable number of fake coal columnar activated carbon are mixed with inferior raw materials diatomite It is fired with very low carbon content, most of which are inactive substances. This carbon is relatively white in color, very heavy in hand feel, long in particle length, and high in strength. Collision with each other will give a clear sound similar to ceramic knocking. When you break it by hand, you can find white fine particles on the section,
Coal based columnar activated carbon is a very good adsorbent. It is made of wood charcoal, bamboo charcoal, various fruit shells and high-quality coal as raw materials through a series of processes such as crushing, screening, catalyst activation, rinsing, drying and screening through physical and chemical methods. It has the dual characteristics of physical adsorption and chemical adsorption, and can selectively adsorb the gas phase, Various substances in the liquid phase to achieve the purpose of decolorization, purification, disinfection, deodorization, decontamination and purification The inspection standard can be in accordance with the Chinese national standard. The use of powdered coal columnar activated carbon in China is as follows: 59.8% for medicine, 26.6% for oral glucose, 10.8% for food industry, 2.8% for other aspects, and the use of granular coal columnar activated carbon in China is as follows: 51.2% for synthetic fiber carrier, 13.0% for PVC carrier, 23.5% for water purification, 7.7% for synthetic desulfurization, 4.6% for others
One of the large domestic manufacturers of coal based columnar activated carbon, providing services such as selection of coal based columnar activated carbon, renewal of coal based columnar activated carbon, and recovery of coal based columnar activated carbon. Its main products - solvent recovery coal based columnar activated carbon, carrier coal based columnar activated carbon, coconut shell coal based columnar activated carbon, wood particle activated carbon, coal based columnar activated carbon, air purification coal based columnar activated carbon, Super capacitor carbon, gasoline vapor adsorption recovery carbon, etc.
Coal columnar coal columnar activated carbon is made of high-quality anthracite as raw material, refined and processed by advanced technology, and its appearance is black columnar particles; The product has reasonable pore structure, good adsorption performance, high mechanical strength, easy to renew repeatedly, low cost and other characteristics; It is used for purification of toxic gases, waste gas treatment, purification of industrial and domestic water, solvent recovery, etc. Products of coal based columnar activated carbon: coal based columnar activated carbon for gas purification, coal based columnar activated carbon for desulfurization, coal based activated carbon for solvent recovery, coal based columnar activated carbon for sugar, and coal based columnar activated carbon for water purification, Coal based columnar activated carbon for beverages, and coal based columnar activated carbon for filtration Product details: 1. Coal based columnar activated carbon for gas purification is used for chemical raw material gas, chemical synthesis gas, pharmaceutical industry gas, carbon dioxide gas and hydrogen for beverages, nitrogen, lvqi, Purification of hydrogen chloride, ozone, ethylene hydrocarbon, ethane, butane, cracking gas, inert gas, atomic facility exhaust, etc. It is also used to remove pollutants in the air, as well as separation and purification of mixed gases. It can also be used for disinfection and filtration of gas masks and protective equipment
