Method and apparatus for comminuting of solid particles

A device for comminuting already comminuted particles to produce super fine particles comprising:

• a cylindrical vessel having outlets near the upper end thereof;
• means for feeding said particles into said vessel;
• a drive shaft rotatably mounted in said vessel;
• means for rotatably driving said drive shaft;
• a plurality of screens connected to said drive shaft for rotation therewith, said screens being spaced from each other in opposing relationship;
• a compressor fan connected to said shaft for rotation therewith, said compressor fan being positioned in said vessel to drive the particles upwardly through said screens;
• cyclonic classifier means for separating microparticles from gas in which they are carried;
• and
• first and second centrifugal fans connected to said shaft for rotation therewith, said first fan being positioned opposite a first one of the outlets of said vessel to drive the comminuted particles and gas carrying said particles through said first one of said outlets to said cyclonic classifier means, said second fan being positioned opposite a second one of the outlets of the chamber to drive microparticles and gas through said second one of said outlets to said cyclonic classifier means.

A device for further comminuting particles to produce super fine particles comprising:

• a vertically mounted vessel devoid of any rotating circular solid plates;
• means for feeding said comminuted particles into said vessel;
• centrifugal compression fan means mounted for rotation in said vessel for forming a pressurized vertically uplifting high velocity gas stream for suspending said particles in said gas stream;
• means for creating vertical spiral gas vortexes and cavitation in said high velocity gaseous medium, said comminuting means being mounted for rotation in said vessel for comminuting said suspended particles;
• means for rotatably driving said compression fan means and said comminuting means thereby creating said vortexes and said cavitation in the pressurized high velocity gas medium;
• cyclonic classifier means for collecting the comminuted super fine particles;
• and
• means in said vessel for driving said comminuted particles suspended in the high velocity pressurized gas stream into said cyclonic classifier.

A method for further comminuting particles already comminuted to a super fine state comprising the steps of:

• vertically and upwardly feeding said particles into a pressurized high velocity gas stream located in a vessel unobstructed by rotating circular plates;
• driving said particles and said high velocity gas stream vertically upward so that they are suspended in said vessel;
• forming vertical spiral gas vortexes and cavitation in the high velocity compressed gases in said vessel;
• driving said particles through said high velocity vertical spiral gas vortexes to effect super fine comminution thereof;
• and
• feeding the super fine comminuted particles into a cyclone to separate said particles from the high velocity pressurized gas stream.