In sizing analysis of fine material, preliminary screening by washing a weighed
sample on a 200-mesh screen, perhaps with use of a dispersing agent, such as
sodium silicate. Removal of the minus fraction (which is settled and later
brought into account) is followed by drying of the on-size and by standard
sizing analysis. Screen action is thus rendered more efficient. Pryor, 3
Source:
Dictionary of Mining, Mineral, and Related Terms
