Can we reduce the ratio of crystalline to amorphous SiO2 in ash with the help of mechanical operations like Ball Milling?
No, mechanical action (as polishing or ball milling ) alone cannot change the crystallinity of a powder. It can only change (reduce) the size of the particles (crystallites).
In order to change the crystallinity, you need to perform a thermal treatment to your powder as annealing for instance.
A mechanical strain as high pressure compression can induce crystallinity changes of a powder if high enough to induce a phase transition of constituting crystallites.
It cannot change in the crystallinity of the material. Ball milling is just a tool to reduce the size of the particles. One more thing, we can do mix different materials followed by calcination makes composites and single-phase material, etc.
If your particles are big enough, so that ball milling could be effective, then you can reduce "crystallinity", measured by the width of XRD peaks (width of peaks depends on size of particles).
The size of the crustaline particles can be reduced. This will be to the certain level and not pure amorphous materilal.
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