New methods of producing narrower particle size distribution precipitated
silica and/or silicate materials are provided. Such a method permits a
significant reduction in manufacturing costs through the utilization of
more efficient drying/evaporation components, in essence, in one
potentially preferred embodiment, production of such silica and/or
silicate materials followed directly by a hydraulic chamber press
filtering step combined with vacuum dewatering subsequently leading to
the needed resultant particle comminution. The resultant precipitated
silicas and/or silicates produced thereby exhibit greater density prior
to comminution and thus greater propensity for more uniform milling than
previously utilized and prevalent spray/flash drying apparatuses. Also
encompassed within this invention are the resultant precipitated silica
and/or silicate particles produced, including those that surprisingly
exhibit extremely high transmittance properties, thereby potentially
providing excellent narrow particle distribution silica materials for
clear (transparent) end-uses.