Study on the Transformation of Calcium Carbonate into Organic Calcium from Eggshell

China is the largest egg production and consumption country in the world. There are abundant eggshell resources in our country, which contains amount of calcium carbonate, while most of them has been abandoned, which has caused the environmental pollution and resources waste. It is significant to study the utilization of calcium carbonate in eggshell. The organic calcium can be acquired by two ways: one is to calcine, and the other is to add organic acid into eggshell power directly. The eggshell is a good source of calcium in food, and has broad development prospects. The research status for preparation of organic calcium using eggshell in recent years were discussed, and some presumptions about using eggshell calcium carbonate convert to the organic calcium were pointed out, which aimed to offer the scientific theory for the development and utilization of the eggshell calcium carbonate.