ceramic balls to further reduce the particles to usable fractions the resulting 20 mesh fraction was blended with ammonium nitrate material and blast tests were conducted in accordance with the above referenced example apatite tested in accordance with the aforementioned example was made with precursor materials phosphoric acid slaked lime and bayer liquor as per the following process a mixture of phosphoric acid carbon dioxide and refinery spent bayer liquor was heated to 70 u00b0 c in some embodiments add additional carbonate or phosphate to increase yield in some embodiments an alternative phosphorous source is crandalite next slaked lime was added and stirred for 15 30 minutes the resulting mixture was filtered washed and oven dried after preparation entrained liquor was removed via an additional filtration and washing step the resulting material tested in accordance with the aforementioned example had the following phases carbonate hydroxyl apatite major hydroxyl apatite trace and possible trace quantities of caco 3 amp hydrotalcite e g formed via impurities in the slaked lime or formed during the apatite production process the apaptite tested in accordance with aforementioned examples is a bayer carbonate hydroxyapatite of the following formula ca 7 na 2 po 4 3 co 3 3 h 2 o 3 oh with major element as follows 12 22 wt co 2 44 49 wt cao 19 26 wt p 2 o 5 7 12 wt na.