The micronized mica minerals have specific applications such as condensers, insulators, plastic fillers, pearlescent pigments, coatings, polymers, equipment, and devices used in aeronautical industry .
where [S.sub.[infinity]] is limited value of the specific surface area of micronized mica product; [S.sub.0] is initial value of the specific surface area after (i) minutes of micronization grinding; and k is kinetic rate of the micronization grinding .
The results of changes in the mean diameter and specific surface area of the micronized mica samples in series [M.sub.1], [M.sub.2], [M.sub.3], and [M.sub.4] are given in Table 2.
The characteristic parameters of micronized mica samples are presented in Table 3.
Based on this, detailed examination of the micronized mica sample, series [M.sub.4], was carried out.
The results of the X-ray analysis of the initial mica sample (series [M.sub.0]) and micronized mica sample (series [M.sub.4]) are shown in Figures 1 and 2,respectively.
The appearances of the minimal intensities in diagram (Figure 2) indicate degradation of crystal lattice in the micronized mica sample, series [M.sub.4] .
Results of DTA and TG analyses of the initial mica sample (series [M.sub.0]) and micronized mica sample (series [M.sub.4]) are shown in Figures 3 and 4, respectively [11,15].
DTA curve of micronized mica sample [M.sub.4] (after 360 minutes of grinding) is slightly changed in comparison with the DTA curve recorded before micronization treatment (Figure 4).