Figure 2. Flow chart of the grinding and blending process. %Lim, %Add, %Clay = the percentages of the limestone, additive and clay in the three weight feeders. LSF Mill, SM Mill = the spot values of LSF and SM in the RM outlet, while LSF S, SM S, LSF M, SM M = the modules of the average sample and the measured one. Finally LSF KF, SM KF