| 摘要 |
A method of comminuting a solid material comprising calcium carbonate to obtain a product containing at least 60% by weight of particles smaller than 2 microns equivalent spherical diameter comprises forming an aqueous suspension of the solid material which has a solids content in the range of from 5% to 50% by weight of dry solids and contains a dispersing agent, comminuting the solid material in the suspension by agitating the suspension in admixture with a particulate grinding medium, separating from the suspension thereby obtained an aqueous suspension containing comminuted solid material at least 60% by weight of which is smaller than 2 microns equivalent spherical diameter, flocculating the comminuted solid material by means of an electrolyte having a multivalent cation, and dewatering the aqueous suspension containing the comminuted and flocculated solid material.
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