Food grade calcium carbonate can be used in food, toothpaste, medicine.
Also known as precipitated calcium carbonate, calcium carbonate is referred to as, limestone and other raw materials of calcined lime (mainly calcium oxide) and carbon dioxide, and water digestion lime lime (mainly calcium hydroxide), and then pass into the carbonization of milk of lime to produce calcium carbonate carbon dioxide precipitation, finally by dehydration, drying and crushing the system. Well. Sodium carbonate and calcium chloride can be used for the first time to produce calcium carbonate precipitation, and then dehydrated, dried and crushed. As the settling volume of light calcium carbonate (2.4-2.8mL/g) is larger than that of heavy calcium carbonate (1.1-1.9mL/g), it is called light calcium carbonate.
Properties: white powder. Tasteless, odorless. Proportion of about 2.71. Decomposition at 825 to 896.6 DEG C. Melting point 1339 DEG C. There are two shaped morphology of amorphous and crystalline, crystal shape can be divided into six orthorhombic and hexagonal columnar or diamond. Insoluble in water and alcohol. Soluble in acid, at the same time emit carbon dioxide, exothermic reaction. Soluble in ammonium chloride solution. Stable in the air, with a slight ability to absorb moisture.