Patent ID: 9650258
Date: 2017-05-16
CPC Classifications: B02C,B41M,C01F,C01P,C04B,C08K,C09C,C09D,D21H,Y10T

Claim:
1. A method for producing a mineral particle fine fraction from a feed material comprising calcium carbonate, the method comprising: (i) milling the feed material in a milling machine to obtain a first milled feed material; (ii) subjecting the first milled feed material to a disc stack centrifuge to obtain a mineral particle fine fraction and a mineral particle coarse fraction; and (iii) either feeding a part or all of the mineral particle coarse fraction to a milling machine and/or to a disc stack centrifuge and/or taking off a part or all of the mineral particle coarse fraction, to obtain a mineral particle fine fraction comprising mineral particles comprising calcium carbonate, said mineral particles, when in a densely compacted bed form, have a volume defined median pore diameter from 0.01 to 0.04 micrometre, an intruded total specific void volume of 0.1 to 0.3 cm