NEPHELINE SYENITE POWDER WITH CONTROLLED PARTICLE SIZE AND NOVEL METHOD OF MAKING SAME

摘要

An ultra-fine nepheline syenite powder produced from a pre-processed nepheline syenite powder feedstock. The powder having a "controlled" maximum grain size D95 or D99 of less than about (20) microns and a "controlled" minimum grain size D5 in the range of (2-8) microns with a particle size spread D5-D95 of less than about (12) microns.