Process and apparatus for grinding and sifting a product

Details Process and apparatus for grinding and sifting a product Process and apparatus for grinding and sifting a product

1996-08-20

1999-03-30

Husar, John M.

Solid material comminution or disintegration

Processes

With heating or cooling of material

241 241, 241 27, 241 65, 241 791, 241DIG14, 241DIG37, B02C 2312, B02C 2318

Patent

active

058878033

ABSTRACT:
The invention relates to a process and an apparatus for grinding and sifting a product, in which the product is embrittled by a coolant and is comminuted in a mill (8), the comminuted product being fed, after comminution while keeping away ambient air and the moisture this involves, to a sifter (14). With the process and the apparatus according to the invention, the product can be comminuted and sifted in a closed-loop process without separating agents having to be fed to the ground product prior to sifting to overcome electrostatic charging. The sifter (14) is preferably operated with the gaseous coolant which is used to operate the mill (8) so that any losses of sifter circuit gas occurring during sifting can be compensated by feeding in a gaseous coolant. The total duration of the process can be reduced considerably.

REFERENCES:
patent: 3921917 (1975-11-01), Meinass
patent: 4406411 (1983-09-01), Gall et al.
patent: 4721256 (1988-01-01), Lyman
patent: 4863106 (1989-09-01), Perkel
patent: 4934609 (1990-06-01), Lindauer et al.
patent: 4962893 (1990-10-01), Bochmann et al.
patent: 5588600 (1996-12-01), Perfido et al.

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