Calcium carbonate is an inorganic compound that is the main component of limestone, marble, etc. Calcium carbonate is usually white crystal, odorless, basically insoluble in water, and easy to react with acid to release carbon dioxide. It is one of the common substances on the earth, exists in aragonite, calcite, chalk, limestone, marble and other rocks, and is also the main component of some animal bones or shells. Calcium carbonate is also an important building material and is widely used in industry.
Calcium carbonate is a white fine crystalline powder, tasteless, odorless, amorphous and crystalline two forms. The crystalline type can be divided into rhombic crystal system and hexagonal crystal system (anhydrous calcium carbonate is colorless rhombic crystal, calcium carbonate hexahydrate is colorless monoclinic crystal), almost insoluble in water, dissolved in water containing ammonium salt or iron trioxide, insoluble in alcohol.
Heavy calcium carbonate
Heavy calcium carbonate (commonly known as heavy calcium) is made by mechanical method (with Raymond mill "or other high pressure mill) directly crushed natural calcite, limestone, chalk, shells, etc.
Light calcium carbonate °
Light calcium carbonate (commonly known as light calcium) is the calcination of limestone and other raw materials to produce lime (mainly calcium oxide) and carbon dioxide, and then add water to digest lime to produce lime milk (mainly calcium hydroxide), and then pass carbon dioxide carbonized lime milk to produce calcium carbonate precipitation, and finally by dehydration, drying and crushing.
Crystal calcium carbonate
Calcium hydroxide is reacted with hydrochloric acid to produce calcium chloride, decolorized by activated carbon to remove impurities, calcium oxide is carbonated with carbon dioxide in the presence of ammonia water to obtain calcium carbonate, and then obtained by crystallization, separation, washing, dehydration, drying, and selection.
Industrial use
Calcium carbonate is a valuable resource for a wide range of uses limestone as a mineral raw material trade name. In modern industry, limestone is the main raw material for the manufacture of cement, lime, calcium carbide, is an indispensable flux limestone in the metallurgical industry, high-quality limestone after ultrafine grinding, is widely used in the manufacture of paper, rubber, paint, coatings, medicine, cosmetics, feed, sealing, bonding, polishing and other products.
