Can you please explain little bit more about your concern. Question is not clear.

Dear Friend

please just see these papers and ask me every question:

Answer:

bovine bones were boiled for 12 h to remove their fat. In order to remove moisture, the wet bones were heated to 110 °C and kept at this temperature for 2 h. To prevent the blackening with soot during heating, the bones were cut into approximately 10-mm thick pieces and heated to 550 °C for 2 h in air to allow evaporation of organic substances. The blackened bone pieces were heat-treated for 3 h at 850 °C. The powdered mixture was then loaded into a hardened steel bowl along with a ceramic ball with 10 mm diameter and 110 gr mass. The ball-to-powder weight ratio (BPR) was 15, and the rotational speed was 600 rpm. The sample was subsequently heated in a furnace to 850 °C for 8 and 10 h. The time of milling by using the planetary ball mill was set on 10 h.

http://www.scientific.net/AMR.829.314

http://www.sciencedirect.com/science/article/pii/S0272884215011815

http://www.sciencedirect.com/science/article/pii/S0925838816310222

Indeed, the question is unclear.