The main component of the binder of columnar activated carbon

During the processing of columnar activated carbon, the raw coal needs to be ground first, then the corresponding binder is added for kneading, and then extruded into strips.

The binders used in columnar activated carbon are generally coal tar, pitch, and water.

The specific preparation process is: crushing and pulverizing the coal to 100% passing through a 100-mesh sieve and 90% passing through a 200-mesh sieve, mixing coal, hot oil pitch and water in a certain proportion, and mixing and kneading at a certain temperature. powdered activated carbon wastewater treatment  Use a forming abrasive tool to press and shape the matched coal on a press to form a smooth, non-sticky, and tough activated carbon strip.

What are the main functions of these binder ingredients?

The main function of the binder is to give the columnar activated carbon strength. If the amount of the binder is small, the strength of the activated carbon produced is difficult to meet the requirements. However, the co-carbonization phenomenon occurs when the tar pitch-type caking agent is carbonized with coal. The anisotropic components in the carbonized product are fully developed, and a carbon precursor with good orientation, easy graphitization, and low amorphous carbon content is generated, which is not conducive to the production of high-quality activated carbon.

The role of water is that the surface tension of water promotes the cohesion of coal powder and creates conditions for the compaction of the strips. bulk activated carbon When there is little water, the effect of surface tension is not obvious: when there is too much water, the distance between the pulverized coal particles increases due to the presence of water, and the effect of water is difficult to play. The appropriate value of moisture varies with the type and particle size of coal, and the finer the coal, the higher the appropriate moisture value and the narrower the allowable range of variation. We can look at a mix ratio of Qitaihe long bituminous coal, coal: tar pitch: water = 62:28:10.