Calcium powder, commonly known as limestone and stone powder , is mainly composed of calcium carbonate , which is weakly alkaline , difficult to dissolve in water, and soluble in acid.   Calcium powder distribution   It is a common substance on the earth and is found in rocks such as aragonite , calcite , chalk, limestone, marble, and travertine. It is also the main component of animal bones or shells.   Calcium powder classification   Calcium powder can be divided into: heavy calcium powder, light calcium powder , active calcium powder , flue gas desulfurization calcium powder, ultrafine calcium carbonate , etc.   Heavy calcium powder   The shape of heavy calcium carbonate is irregular, its particle size varies greatly, and the particles have certain edges and corners, the surface is rough, the particle size distribution is wide, the particle size is large, and the average particle size is generally 1~10 μm . Heavy calcium carbonate is divided into: coarsely ground calcium carbonate (above 3μm), finely ground calcium carbonate (1~3μm), and ultrafine calcium carbonate (0.5~1μm) according to its original average particle size (d). The powder characteristics of heavy calcium carbonate are: (1) irregular particle shape ; (2) wide particle size distribution; (3) large particle size.   Calcium carbonate has been widely used in papermaking , plastics, plastic films , chemical fibers , rubber , adhesives, sealants , daily chemicals, cosmetics, building materials, coatings, paints, inks, putties, sealing wax , putty , felt packaging, medicine, and food. (such as chewing gum , chocolate ) and feed, its functions are: increasing product volume, reducing costs , improving processing properties (such as adjusting viscosity, rheological properties, vulcanization properties), improving dimensional stability , reinforcing or semi-reinforcing, improving Printing performance, improve physical properties (such as heat resistance , matting, abrasion resistance , flame retardancy , whiteness, gloss ), etc.   Light calcium powder   Widely used in papermaking, plastics, plastic films, chemical fibers, rubber, adhesives, sealants, daily chemicals, cosmetics, building materials, coatings, paints, inks, putties, sealing wax, putty, felt packaging, medicine, food (such as chewing gum) , chocolate) and feed, its functions include: increasing product volume, reducing costs, improving processing properties (such as adjusting viscosity, rheological properties, vulcanization properties), improving dimensional stability, reinforcing or semi-reinforcing, improving printing performance, Improve physical properties (such as heat resistance, matting, abrasion resistance, flame retardancy, whiteness, gloss), etc.   Active calcium powder   Calcium supplements. It can promote the calcification of bone marrow and teeth, maintain the normal excitability of nerves and muscles , and reduce capillary permeability. Used to prevent and treat chronic diseases caused by calcium deficiency.   The main purpose   1. Calcium powder for rubber industry   Rubber – Calcium powder for rubber: 400 mesh, whiteness: 93%, calcium content: 96%, calcium powder is one of the largest fillers used in the rubber industry . Calcium powder is filled in large amounts in rubber, which can increase the volume of its products and save expensive natural rubber , thus greatly reducing costs. Calcium powder is filled into rubber to obtain higher tensile strength , tear strength and wear resistance than pure rubber vulcanization .   2. Value of calcium powder used in plastics industry   Calcium powder 400 mesh is used for plastic masterbatch and color masterbatch . It is required that the whiteness remains unchanged after high temperature heating. The ore structure is large crystalline calcite. Calcium powder content: 99%, whiteness: 95%. Calcium powder can play a role in plastic products. It is a kind of skeleton that plays a great role in the dimensional stability of plastic products. It can also increase the hardness of the products and improve the surface gloss and surface smoothness of the products. Since the whiteness of calcium carbonate is above 90, it can also replace expensive white pigments.   3. Calcium powder for paint industry   Calcium powder for paints and latex paints is 800 mesh or 1000 mesh, whiteness: 95%, calcium carbonate: 96%. The amount of calcium powder used in the paint industry is also large, for example, the amount used in thick paint is more than 30%.   4. Calcium powder for water-based coating industry   Calcium powder for water-based coatings is 800 mesh or 1000 mesh, whiteness: 95%, calcium powder: 96%. Calcium powder is more widely used in the water-based coating industry. It can make the coating non-settling, easy to disperse, good gloss and other characteristics. The dosage of water-based paint is 20-60%.   5. Calcium powder for papermaking industry   Heavy calcium powder for papermaking 325 mesh, whiteness requirement: 95%, calcium powder content: 98%, calcium powder plays an important role in the papermaking industry , it can ensure the strength and whiteness of the paper, and the cost is low.   6. Dry mortar , concrete and calcium powder for construction industry   The dry mortar uses calcium powder 325 mesh, whiteness requirement: 95%, calcium powder content: 98%, calcium powder plays an important role in concrete in the construction industry. Not only can it reduce production costs , but it can also increase the toughness and strength of the product.   7. Calcium powder for fireproof ceiling industry   Calcium powder for fireproof ceilings is 600 mesh, whiteness requirement: 95%, calcium powder content: 98.5%. Calcium powder is needed in the production process of fireproof ceilings . It can improve the whiteness and brightness of the product, and the fireproof performance will also be increased.   8. Calcium powder for artificial marble industry   Calcium powder for artificial marble is 325 mesh, whiteness requirement: 95%, calcium powder content: 98.5%, pure and without impurities, calcium carbonate has been widely used in artificial marble production.   9. Calcium powder for floor tile industry   Calcium powder for floor tiles is 400 mesh, whiteness requirement: 95%, calcium powder content: 98.5%, pure and free of impurities. Calcium powder can be used in the floor tile industry to increase the whiteness and tensile strength of the product, improve the toughness of the product, and reduce production costs.