In the water treatment industry, the words sintered activated carbon, compressed activated carbon, extruded activated carbon, CTO, and net carbon are often mentioned or used, but many people do not really understand them.
Activated carbon family
Sintered activated carbon, compressed activated carbon and extruded activated carbon are named after their production process characteristics. CTO and net charcoal are words that are known for their final shape.
Although they have the same shape, the internal quality and production process are very different.
Sintered activated carbon: It is made by mixing activated carbon powder material and polymer hot-melting pore-forming material, pouring into special mold and sintering at 200-300 °C; because the bonding material itself has pore-forming property, after mixing with activated carbon, The characteristics of the activated carbon powder have large specific surface area, excellent pore-forming property, better filtration effect and more complete contact with liquid; due to complicated processing technology and limited production capacity.
Compressed activated carbon: mixed with activated carbon powder material and inorganic liquid binder, poured into special mold, compressed by high pressure compression molding, and dried after being discharged; this process has high content of activated carbon and good filtering effect, but inorganic bonding material It is impossible to form a hole, and the pore diameter is mainly controlled by the particle size of the activated carbon, and the pore-forming property of the filter element is not good.
Extrusion activated carbon: It is a mixture of activated carbon and ordinary hot-melt resin, and then placed in a screw extruder for heating and extrusion molding. In the production process, the surface of the activated carbon is melted by the hot melt resin at a high temperature, and the activated carbon micropores are blocked, the adsorption effect is lost, the production cost is low, and the output is high. In fact, it is a decoration, it has no effect.
CTO, net carbon, extruded activated carbon, sintered activated carbon, and compressed activated carbon are broadly described as the rod-shaped form of activated carbon, which can be collectively referred to as shaped activated carbon.
The valuable value of activated carbon
At present, the use of molded activated carbon filter in the water treatment industry is receiving more and more attention. The main reasons are:
1. The activated carbon is adsorbed and intercepted in one body, which not only has the adsorption property of activated carbon but also has dense voids, which can effectively intercept the impurities of large particles and effectively reduce the physical pollution of water quality;
Second, the pore size can be arbitrarily adjusted, the minimum can reach 0.2 microns, which is better than the so-called large-flux hollow ultrafiltration membrane on the market;
Third, the black water flowing out is less than the granular activated carbon, and it will not desorb due to the scouring of the water flow as the granular activated carbon, forming secondary pollution;
Fourth, the processing of activated carbon powder below 80 mesh, the specific surface area is large, so that the performance of activated carbon can be fully exerted.
Sintered activated carbon is a kind of shaped activated carbon that has the above functions. Because everyone mixes sintered activated carbon and extruded activated carbon, many manufacturers avoid the confusion, and some of the sintered activated carbon is called charcoal (Guangzhou Kangrui Environmental Protection), and some are called black magic. (BLACK MAGIC) Activated carbon rod (3M company).
Sintered activated carbon technology Due to its special molding process, it is possible to develop a composite filter element using activated carbon as a main body and a mixture of various ultrafine filter materials. The product has special filter elements for decolorization and deodorization, organic matter removal and softening of water; special metal removal filter for removing heavy metals such as aluminum, mercury, manganese and arsenic in water, special defluorination filter for high-fluorine water area; Special mineralized filter element for adding trace elements and minerals to soft water; inhibiting bacterial growth and adding antibacterial filter for antibacterial materials.
Sintered activated carbon filter has obvious effect of filtering impurities due to its twisted cage micro-aperture channel. Due to the accumulation of impurities, the filter element is easy to block and the water flow will become smaller. Therefore, foreign water treatment companies (such as 3M) propose “The filter element that will block is the good filter elementâ€; in order to prolong the use time of the filter element to reduce the blockage situation, the pre-treatment pre-filter filter element should be better before sintering the activated carbon filter element, such as: 1um pp cotton filter element.
Differentiate filter experiment
The sintered activated carbon filter has similar shapes and low-end extrusion profiles. There are two main methods for distinguishing:
1. Hydrophilic experiment, the sintered activated carbon has good hydrophilicity, and drops a drop of water to immediately penetrate into the filter element, and the extruded activated carbon water droplets will always float on the filter element;
Second, the water that flows out of the sintered activated carbon filter just after passing through the water is hot, and this situation does not occur in the extruded activated carbon filter.
First, the cola (ink) experiment: the experimental filter element is erected on the prepared white paper, and the cola is directly poured into the inner hole of the experimental filter element. Later, the outer wall of the filter element evenly oozes clear water drops, and the sweet taste of cola is obviously weakened. Ordinary filter cartridges do not have this advantage.
The second is bleaching water (bleaching liquid) experiment: take a large glass (500 ml), fill with water, drip 2-4 drops of bleach (bleaching solution), stir, pour the mixture into a small cup to a disposable Put the experimental filter into another large glass, then pour the mixture in the large glass into the inner hole of the experimental filter. Later, the outer wall of the filter evenly oozes clear water beads, and the large filter of the experimental filter After the liquid is enough (1 cm high from the bottom of the cup), take out the experimental filter element. At this time, take out the residual chlorine test solution and drop 2-3 drops into the effluent water and the original reserved mixture, respectively, and the exudation can be found. The color in the liquid remains clear and the color immediately turns yellow in the mixture. The sintered activated carbon filter has the advantages of superior removal of residual chlorine and its derivatives.
Sintered activated carbon due to special sintering process, low productivity, large mold input, strict material selection (material particle size should be less than 80 mesh), its product cost is higher than ordinary filter core, but its superior product performance, unique vision of the industry elite I have been using this high-end product for a long time. With the constant regulation of the industry, inferior filter materials that are rampant for price competition must be abandoned, and sintered activated carbon filter cartridges will become an essential accessory for the water purification industry.
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