White porous block, granular, or honeycomb-like solid, taste slightly bitter, odorless, colorless aqueous solution. It is commonly used industrial and laboratory desiccant, such as for nitrogen, oxygen, hydrogen, hydrogen chloride, sulfur dioxide and other gases, dry, inorganic industrial metal used for the production of calcium, barium chloride, various calcium salts (such as calcium phosphate, etc.). The construction industry as antifreeze, to speed up the concrete to harden and increase the capacity of the construction mortar cold. Haploid breeding of industrial microorganisms used as the medium. Analytical Chemistry for the determination of iron and steel carbon content, whole blood glucose dissolved, serum inorganic phosphorus and serum alkaline phosphatase activity and so on. Also be used as a protective agent aluminum metallurgy, refining agent. In addition, the fabric used as a fire retardant, harbor anti-fogging agent, road dust agents and food preservatives. In medicine, it can be used to reduce blood calcium caused by tetany, as well as gripes, ureteral colic and so on.