Mineral dissociation is the change of the geometrical existence mode of constituent minerals during the crushing of ores, which is not only intuitive but also easy to be quantified.However, the generation and settlement of monomer are related to many factors.The influencing factors listed by Malvik (1976) in "study on the dissociation properties of minerals" include:
Crystal size, content and grinding fineness of minerals
Because pulverized dissociation is the main way of mineral dissociation, it is mainly achieved by reducing the volume of crushed particles.Therefore, the larger the crystal size of the mineral, the smaller the grinding fineness, and the more favorable to the mineral dissociation.The effect of mineral content mainly reflects the function of mineral technological granularity.Because the higher the content of minerals in the ore, the more opportunities for the same mineral aggregate, the aggregate size formed by this process must be both large and large.The so-called monomer, refers to only contains one kind of mineral crushing particles.Therefore, minerals with large technological granularity are easy to be dissociated.In fact, the process size is more important than the crystal size in terms of the effect of mineral volume on dissociation.
Based on the influence of crystal size, content and grinding fineness on dissociation, Gordon made a quantitative investigation on the crushing results of ores composed of P and G minerals with the same particle size based on the dissociation model he designed. The results are shown in table 2-11-1 and figure 2-11-4.
It can be seen from table 2-11-1 and figure 2-11-4 that:
[1] if the grinding fineness cannot be less than the mineral crystal size, the mineral phase with lower content will not have monomer production;
[2] only when the grinding fineness is obviously smaller than the mineral crystal size, the mineral phase (P) with lower content will have a certain amount of monomer.
(3) if the grinding fineness is greater than the crystalline grain size, so only when Φ V value is very high, content more
Mineral phase will have a considerable number of basically stable monomer production;
(4) in any case, a high content mineral (G) will always have more monomers than a low content mineral (P).
