1.Powder characteristics

The heavy calcium carbonate particles are irregular in shape and are polydisperse powders. Its particle size is large, and the average particle size is generally 5-10 μm, and the distribution is wide. It is almost insoluble in water, soluble in water containing ammonium salts or ferric oxide, and insoluble in alcohol. In the case of dilute acetic acid, dilute hydrochloric acid, dilute nitric acid, it is inflated and dissolved. The heat is decomposed into calcium oxide (CaO) and carbon dioxide (CO2).

The light calcium carbonate particles are regularly shaped and can be regarded as a monodisperse powder, but can be of various shapes such as a spindle shape, a cuboid shape, a needle shape, a chain shape, a spherical shape, a sheet shape, and a square prism shape. These different shapes of calcium carbonate can be prepared by controlling the reaction conditions. Its particle size is small, the average particle size is generally 1-3μm, and the distribution is narrow. It is hardly soluble in water and alcohol, soluble in acid, and emits carbon dioxide, which is an exothermic reaction. Also soluble in ammonium chloride solution, stable in the air with a slight moisture absorption capacity.

Grinding mill

2.Production process

Heavy calcium carbonate (heavy calcium) is obtained by directly pulverizing natural limestone, calcite, etc. by a mechanical method (grinding equipment like Raymond mill, Ultrafine mill etc).

The light calcium carbonate adopts the carbonization method, and the limestone and the white coal are mixed in a certain ratio, and then the high-temperature calcination, water digestion, carbon dioxide carbonization, centrifugal dehydration, drying, cooling, pulverization, and sieving are obtained.

3.Use

Heavy calcium carbonate is widely used, and it can be filled with rubber to obtain higher tensile strength, tear strength and wear resistance than pure rubber sulfide. It can play a skeleton role in plastic products, has a great effect on the dimensional stability of plastic products, can also improve the hardness of the products, and improve the surface gloss and surface flatness of the products. It is used in the waterborne coating industry to make the coating not settle and easy to disperse. The heavy calcium carbonate for paper making can guarantee the strength and whiteness of the paper, and the cost is low. Heavy calcium carbonate plays an important role in concrete in the construction industry and can increase the toughness and strength of the product. It is used in the floor drilling industry to increase the whiteness and tension of the product, improve the toughness of the product, and reduce production costs.

Light calcium carbonate can be used as a filler in the rubber, plastics, paper, paint and ink industries, and is widely used in the production of organic synthesis, metallurgy, glass and asbestos. It can be also used as a neutralizer for industrial wastewater, an antacid for gastric and duodenal ulcer disease, an antidote for acidosis, a SO2 eliminator for SO2-containing waste gas, a dairy feed filler and a grease anti-adhesive. . It can also be used as a raw material for tooth powder, toothpaste and other cosmetics.

Calcium carbonate is a sunrise industry in the 21st century. With the continuous advancement of powder technology in China, their application fields are constantly expanding, and they will play a greater advantage in the future. And for calcium carbonate grinding mill, we recommend you Guilin Hengda Mining Machinery Co., ltd, which is a professional grinding mill manufacturer, more details please visit www.hengdamill.com.

5th Dec 2018