This paper discusses the application of the tail gas of the yellow phosphorus electric furnace in the production of tripoly sodium phosphate and calcium hydrophosphate of tooth paste- grade.

A purification process of wet-process phosphoric acid, which is used for the production of toothpaste-grade calcium hydrogen phosphate, was studied.

This paper introduces some synthetic methods calcium hydrogen phosphate on toothpaste class and place under compares and choice the synthetic methods on the resources of stuff and acquired synthetic.