Patent ID: 6946010

Claim:
A method for preparing an abrasive slurry composition, comprising the steps of: introducing, into a reactor container, reaction mixture contents comprising reactants effective to form a suspension of water-insoluble abrasive particles; feeding the suspension into a chamber filter press in which the suspension is filtered by a plurality of chamber filter plates to partially dewater the suspension to produce first filter cake material; dewatering the first filter cake material under reduced pressure in the interior of the chamber filter and with heating to provide second filter cake material having a solids content of 40 to 90% by weight; fluidizing the abrasive particles in the second filter cake material by combining humectant with the abrasive particles with mixing effective to provide an aqueous suspension of abrasive particles; and wet grinding the aqueous suspension of abrasive particles; wherein the chamber filter press includes a plurality of alternating i) filter plates covered by respective liquid-permeable filter membranes, and ii) diaphragm squeeze plates that each include a diaphragm that is expandable toward an adjoining filter plate; wherein the squeeze plates and filter plates define abrasive suspension flow passages being the areas between each diaphragm included with a squeeze plate and each liquid-permeable membrane associated with an adjoining filter plate, wherein at least one diaphragm is expandable toward an adjoining filter plate effective to promote solid/liquid separation in an abrasive suspension introduced into the flow passages in which liquid is transmitted through the adjoining liquid-permeable membrane; and wherein the filter plates include respective interior filtrate drainage chambers for drainage of liquid filtered from the abrasive suspension.