Abstract: A method for preparing a suspension from a separation process, wherein the suspension is made of a particulate abrasive and a liquid slurrying agent. The method includes the steps of: a) thinning the suspension in a tank with an additional slurrying agent (PEG) without adding additional water, producing a constant volume ratio between the particulate abrasive and the liquid slurrying agent; b) separating the thinned suspension into a liquid and a solid fraction in a centrifugal separator, and c) subsequent refinement or reuse of the separated liquid and solid fractions.