Comminution of materials
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United States of America Patent
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Jul 14, 1981
Issued Date -
N/A
app pub date -
Jul 24, 1979
filing date -
Jan 19, 1977
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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 is disclosed. The method comprises forming an aqueous suspension of the solid material which has a solids content of up to 50% by weight 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, classifying the latter suspension to obtain an aqueous suspension of a fine product which contains at least 60% by weight of particles smaller than 2 microns equivalent spherical diameter, flocculating the fine product by means of an electrolyte having a multivalent cation, and dewatering the aqueous suspension containing the comminuted and flocculated fine product.
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