Method for preparing spherical activated carbon

Abstract

The invention discloses a method for preparing spherical activated carbon and a disc pelletizer. The method comprises the following steps of: grinding carbon powder and coal pitch powder, wherein the carbon powder is coal powder, charcoal powder or a mixture of the coal powder and the charcoal powder in a ratio of 1:1; mixing, and adding prepared modified water; pelletizing by using the disc pelletizer, and drying; and carbonizing, and activating. In a main structure of the disc pelletizer, a seed disc which is concentric and coaxial with a pelletizing disc is arranged, and spheres automatically roll in the pelletizing disc when the diameter of the spheres in the seed disc is 0.5 to 1.0mm, and grow in the pelletizing disc, so that the area of the pelletizing disc is fully utilized, and production efficiency is high. The spherical activated carbon produced by the method has high specific surface area and mechanical strength, is not provided with edges, has a low pulverization degree in conveying, adsorbing and regenerating systems and the like, and has uniform bed resistance and low pressure drop; and special equipment and a steam heat preservation system are not needed in the production process, a forming die is not needed, energy-saving and environment-friendly effects are achieved, and popularization and application are facilitated.

Description

technical field [0001] The invention belongs to the technical field of activated carbon preparation, and in particular relates to a preparation method of spherical activated carbon. Background technique [0002] Activated carbon is not only a good adsorbent, but also a good catalyst carrier. It has a wide range of uses, such as: drinking water purification, sewage treatment, flue gas desulfurization, organic solvent recovery, Vinylon production, gold adsorption, drug decolorization, garbage incineration, etc. [0003] The classification of activated carbon, according to the raw materials used, can be divided into coal charcoal, wood charcoal, shell charcoal, etc.; according to the charcoal and activation process, it can be divided into physical charcoal, chemical charcoal, etc.; according to the shape of activated carbon, it can be divided into spherical Charcoal, columnar charcoal (commonly known as bar charcoal), irregular granular charcoal (commonly known as crushed char...

AI Technical Summary

Problems solved by technology

Its disadvantages: one is that tar needs special equipment and steam insulation system in the process of transportation, storage and production

The second is that there are many problems in the layering process. First, there is a certain range of requirements for the thickness of the powder, that is, 180 mesh (or 200 mesh) exceeds about 95%, and the finer the workmanship is extremely poor, and the finer the powder, the product The performance is better; secondly, layering requires a large number of molds with different apertures, especially when the die hole is smaller than ￠1.75mm layering, it is easy to block, and the barrel touch is time-consuming and labor-intensive; thirdly, the kneading of coal powder and coal tar is called For coal paste, the temperature of the coal paste must be kept at about 30°C during layering, otherwise the mold will be blocked frequently, or even cannot be produced, resulting in waste of raw materials; Fourth, the hydraulic equipment used is complex in structure and difficult to maintain

Third, the workload of carbonization is large, especially in the carbonization process, about 260 kilograms or 73% of harmful substances will be volatilized in the tar, polluting the environment

Fourth, the water capacity of the produced product is not high, the length is uneven, the equalization coefficient is about 2.3, the bed resistance is uneven, the pressure drop is large, and there are many edges and corners, which affect the use effect

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