The pellet production plant was operated until stationary conditions were obtained. Before a sample was collected, there was a break-in period of 5 min with the current additive to insure stationary conditions. MgO and Mg(OH)2 in powder form were used as a pellet additive. The additive flow rate through the volumetric feeder was held constant at 0.8% based on weight produced pellets. The producing conditions can be seen from Table 1.