The influence of additives during wet ultra-fine grinding in agitator beadmills - Part 2: Results and conclusions

Additives that increase the repulsive interactions between particles can im prove the flowability of a suspension. Thus, at constant energy utilization and a higher solids concentration, the mill throughput can be increased. O n the other hand, with a constant solids concentration and equivalent end f ineness, considerable energy savings can be achieved or, respectively, a si gnificantly higher product fineness at constant specific energy can be real ised. The extent of the effects that are seen through the addition of addit ives in wet fine grinding are determined by: the solids concentration, the particle size and thus the distance between t he particles the stress intensity the particle interactions in the initial condition the possible impurities in the product (through wear from the grinding bodi es or wall of the mill) that go into solution, thus altering the particle i nteractions during grinding the amount of energy loss due to viscosity with respect to the total energy used. Experimental investigations were made on two different model substances (li mestone and corundum) with the addition of a number of inorganic and organi c additives. The relationship found between the particles interactions, the ological properties and comminution parameters are of interest, primarily i n the grinding techniques in nano-technology, since only through the additi on of appropriate additives a very larger percentage of particle sizes in t he range <1 mum can be achieved.