Patent ID: 6032882
Filing Date: 2000-03-07
Classification: B02C

Abstract:
A method for circulation grinding of brittle grinding stock in a nip of an interparticle crushing high-pressure roll press, the outlet of which is connected to a sifter, from which separated sifted raw material is re-circulated back to a material inlet of said interparticle crushing high-pressure roll press, comprising the steps:presenting a stream of coarse crushed brittle grinding stock, including some oversize particles, to a nip of a smooth roll press, wherein said smooth roll press nip has a smallest dimension of approximately 4 mm, for coarse-crushing said oversize particles by means of individual particle crushing and without interparticle crushing;arranging said rolls of said interparticle crushing high-pressure roll press to form said nip therebetween with a width greater than a granular size of said grinding stock flowing from said smooth roil press,supplying said stream of brittle grinding stock, after it has passed through said nip of said smooth roll press, to said nip of said interparticle crushing high-pressure roll press;protecting surfaces of said interparticle crushing press rolls against wear by an autogenous wear protection layer that arises during press operation, due to a grid armoring of said interparticle crushing press rolls.