Patent ID: 8079538

Claim:
An apparatus for making a cementitious composition comprising: a clinker feed adapted for feeding clinker; a gypsum feed adapted for feeding gypsum; a grinding mill adapted for receiving said clinker and said gypsum and producing a first resultant cementitious composition from said clinker and said gypsum; a first classifier adapted for receiving said first resultant cementitious composition and separating said first resultant cementitious composition into a first stream of Type I portland cement and a recycled portion; a cooler positioned to receive said first stream of Type I portland cement; a second classifier adapted for receiving a first portion of said first stream of Type I portland cement and separating said first portion of said first stream of Type I portland cement into a primary portion and a secondary portion; a first storage silo adapted for receiving said secondary portion and a remainder portion of said first stream of Type I portland cement; a second storage silo adapted for receiving said primary portion; wherein said recycled portion is fed back into said grinding mill for further processing; wherein said primary portion has a particle size distribution such that substantially all of its particles are of a size of about 10 microns or smaller; wherein said secondary portion and said remainder portion are combinable to form a resultant cementitious composition; wherein said resultant cementitious composition is selected from Type I portland cement and Type III portland cement.