The mixed apatite ore consists of ore powder of type 2:22% <= p2o5 <= 28%, grade 1: p2o5> = 32% & 1 part of ore of sorting p2o5> = 32% to reach p2o5 content> = 30%; particle size < = 0.25mm: 79% min. passed through drying to moisture <= 8%.�volume + -10%