Bone-derived di-calcium phosphate is one of the main by-products of gelatin production. It is mainly used as calcium, phosphorus and other mineral supplements in feed. Its process is simple, controllable, high product stability, available phosphorus content is more than 16.5%, available calcium content is more than 21%, becoming the main components of animal feed and fertilizer, widely used in feed industry, agriculture, animal husbandry and fishery and other related industries.