| 摘要 |
<p>Method for limiting an amount of its particle size smallest fraction which is generated in the counterjet grinding process of minerals so that the amount of the fine (overfine) fraction, whose particle size falls below the smallest aimed particle size, is reduced in the grinding. Amount of the particle sizes which are smaller than the target size, is reduced by taking effect to crash into each other of the particles which happens in the counterjet grinder, wherein in the method at least two side by side coupled grinder pairs (1, 2) are used, wherein the generated kinetic energies are arranged to differ from each other, said energies being calculated by means of crash diameters (d1,- d4) of grinder pairs (1, 2) per one mm2 of the crash cross-section area, wherein the run to crash situation of the particles of rougher fraction ground by means of one grinder of the mentioned grinder pair is improved and by means of the other grinder of the pair the run of the smaller particles to crash situation is weakened.</p> |
