Briquetting

Briquetting / ˈbrɪkɛtɪŋ/ the process of pressing powdery, fine-grained and coarse materials, sometimes with the addition of binders, into large-sized particles under the influence of mechanical force.  The remains of solid combustible fossils (coal, etc.) are briquetted

 Ex. Briquetting played a key role in consolidating finely ground ore particles into compact and manageable forms.