The particle size of the minerals to be conducted flotation operation usually needs designing and planning in advance. The mineral processing can be finished by combining the crusher and ball mill. In the actual operation of the flotation machine, the mineral particles and bubbles are in a relative movement state. The shedding force that the minerals particles and bubbles stand is more complicated and the reaction is fiercer than that in the quiescent state. If the floatability of the mineral particles is better, namely, the contact angle of the mineral particles is larger; the particle size of the flotation can be thicker. Of course, there is certain limit that is called granularity ceiling.
For the flotation of the mineral particles with a relatively coarse grade, it will be more favorable if the air bubbles are larger, in other words, in the case that the bubbles are larger; the contact angles of the minerals to be floated can be smaller. However, if the bubble is too large, the stability of the bubble itself is also poor. The number and size of bubbles in the flotation machine is the sign that determines the beneficiation efficiency. The addition of the flotation reagents should be conducted according to a certain proportion at regular time.
The particle size of the selected minerals is one of the important factors that affect the efficiency of the flotation operation. In order to get a better technical and economic indicators, it is required that the grinding fineness should be reasonable, which not only realizes the full monomer separation of the useful minerals, but also ensures that the coarse particles are not greater than the upper limit and the lower limit of the flotation granularity shall not be less than ten micron.