Introduction of Calcium Carbonate Production Technology for Ultrafine Vertical Mill Processing Coatings

Calcium carbonate is an important and widely used inorganic salt. It is usually divided into heavy calcium carbonate and light calcium carbonate according to different processing methods. Heavy calcium carbonate, also known as ground calcium carbonate, referred to as heavy calcium, is made from natural calcite, limestone, dolomite, chalk, shells, etc. through physical processing of calcium carbonate ultrafine mills; light calcium carbonate is also Precipitated calcium carbonate, referred to as light calcium, is processed by chemical methods. The role of calcium carbonate in powder coatings is to act as a skeleton, increase the thickness of the paint film, and improve the wear resistance and durability of the coating. Guilin Hongcheng is a professional calcium carbonate ultrafine vertical mill manufacturer. The ultrafine vertical mill heavy calcium carbonate powder produced by HLMX series calcium carbonate ultrafine vertical mill is compared with ordinary heavy calcium carbonate and light weight produced by chemical precipitation. For calcium carbonate, it has a series of advantages such as finer fineness, larger specific surface area, and higher chemical stability.

Calcium Carbonate Ultrafine Vertical Mill Processing Calcium Carbonate Calcium Production Process Advantages: Calcium Carbonate Ultrafine Vertical Mill Production of Heavy Calcium is currently the most common way in China, and the technology is relatively mature. Generally, a processing system composed of grinding equipment and grading equipment is used. Products of various particle sizes can be obtained. At present, the fillers used in powder coatings are mainly barium sulfate, including precipitated barium sulfate and ultra-fine barium sulfate. After the European Union and the United States listed barium in barium sulfate as a heavy metal, the practicality of barium sulfate in some export products has been restricted. The price of barium sulfate is higher than that of calcium carbonate, and calcium carbonate is a kind of white filler that is cheap and does not contain heavy metal elements. The requirements required for coatings, its application in powder coatings can reduce costs.

The production process of calcium carbonate ultra-fine vertical mill processing coatings is compared with light calcium: light calcium is produced by chemical precipitation, the particle size is small, the particles are generally spindle-shaped or chain-shaped, and the oil absorption value is higher than that of heavy calcium. The oil absorption value of treated light calcium is also higher than that of ordinary wet ground heavy calcium, which may lead to an increase in the amount of expensive additives when light calcium is used as a filler. The application field of heavy calcium is wider than that of light calcium. In some fields (such as plastics), because the fluidity of ultrafine heavy calcium is better than that of light calcium, its addition amount is larger than that of light calcium. Since the calcium carbonate produced by physical methods is not affected by any impurities and chemical substances, the chemical stability of the product is relatively high; while the production of light calcium carbonate is produced by chemical synthesis, in the process of carbonization reaction It is easy to produce a supersaturation reaction in the medium, and it is easy to cause the free pH value on the surface of the product to be unstable, and at the same time, the product is easy to bring impurities such as coal ash.

Used in powder coatings, superfine heavy calcium carbonate can be used to prepare high-gloss powder coatings, and its comprehensive performance is better than that of light calcium carbonate. In some fields that require no heavy metal content, calcium carbonate can be used instead of barium sulfate. Its main application is related to Coating of indoor appliances, baby toys, etc. 

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