Tannic acid number of different activated carbons are different, Table 1 shows some typical activated carbon adsorption properties abroad, and expressed its phenol values ??are: Requires shell activated carbon concentration in g / L is calculated, so that the standard phenol concentration from 200mg Table 1 different types of activated carbon adsorption properties abroad .2.2 tannic acid value determination method and standard-setting shell activated carbon in the export process, foreign investors are often made tannic acid value measured (estimated for water treatment), but there is no domestic tannic acid value standard method, it is necessary to make a determination of the acid value of orders Ning. The reason according to the Forest Research Institute of Chemical Industry standard tannic acid value assumed Determination formulation. Determination of acid made orders rather standard American Water Works Association, the main reference standard powdered activated carbon ANSL / AWWA B 600, then modify (by a combination of single blender to blender) according to the forest of the experimental conditions. Modify the calculation method, based on 弗伦德利希 adsorption isotherm equation. Tannic acid on a carbon adsorption experiments, the method used to calculate the AWWA tannic acid value of 360mg / L, calculated using the above correction method tannic acid value of 350mg / L. Currently the standard is seeking the views of the activated carbon being reported to higher authorities approved before widespread implementation. The impact of the carbon particle CIP gold extraction process on activated carbon particle size, there are strict requirements. Theoretically, the larger the particle size of granular activated carbon, which is smaller than the surface area, the lower the activity, adsorption efficiency worse. In contrast, small particle size of the activated carbon the specific surface area is relatively large, high activity, strong adsorption capacity. Production of activated carbon granules are mostly worn down from the coarse particles of carbon. As mentioned above, this part of the active carbon having the characteristics of providers, low intensity, continues to wear in the process, it is easy to lost with the tailings. In the process, activated carbon slurry was reverse flow, this flow approach is to rely on inter-stage screening and lift equipment to achieve the shell activated carbon, granular carbon clog the screen too small, causing the process is not smooth. Too coarse granularity of carbon through the pipeline to mention charcoal and wood powdered activated carbon, produced by wear set relatively large. Carbon in pulp adsorption to achieve good results, we must make full contact with the carbon and pulp. If the carbon particle size uneven, prone to segregation in the pulp coconut shell activated carbon, which will affect the uniformity of string Yan W charcoal, charcoal make different size and pulp contact time is not balanced, reduced adsorption. Because water purification activated carbon | carbon | Song Xin coal activated carbon filter provided by Gongyi City Song Xin Industrial Co. filter. Gongyi City Song Xin Industrial Co. filter (www.sxlc.com) strong, credible, in Zhengzhou, Henan cleaning, cleaning equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead the Song Xin filter into the brilliant and you work for a better future!