What are the differences between light calcium carbonate and heavy calcium carbonate
1. Different packing densities
The most obvious difference between heavy calcium and light calcium lies in the different bulk density of the products. Generally, the bulk density of heavy calcium products is larger, ranging from 0.8 to 1.3g/cm3, while that of light calcium products is smaller, mostly ranging from 0.5 to 0.7g/cm3. The bulk density of some nano calcium carbonate products can reach about 0.28g/cm3. Heavy calcium and light calcium products can also be roughly distinguished by the packaging volume of the products. Generally, heavy calcium products are mostly 25kg/ package and the packaging volume is small, while the packaging volume of light calcium products of the same quality is obviously larger. Some nano calcium carbonate products are also packaged in 15kg/ package or 20kg/ package.
Because heavy calcium products have more relative impurities and larger particles, the whiteness of the products is generally 89%~93%, and a few products can reach 95%, while the whiteness of light calcium products is 92%~95%, and some products can reach 96% ~ 97%, which is the main reason why light calcium products are mostly used for high-grade or light-colored products.
Heavy calcium product moisture is low, but also more stable, generally 0.2%~0.3%, some high-grade heavy calcium product moisture can reach about 0.1%. The water content of ordinary light calcium products is 0.3%~0.8%, and sometimes there are certain fluctuations. Nano calcium carbonate products also vary in moisture content depending on the type of application, with some products having a moisture content of less than 0.1 and some products having a moisture content of about 1.5%.
4. Different particle sizes
The particle size of heavy calcium products ranges from 0.5 to 45um, and the smaller the particle size, the higher the price. Currently, there is no industrial production of nano-sized heavy calcium, but some ultrafine calcium products contain a very small amount of particles with a particle size of about 100nm. The particle size of ordinary light calcium products is generally 0.5~15um, and the particle size of nano calcium carbonate is generally 20~200nm. Identification methods can be adopted by transmission or scanning electron microscopy analysis and detection, more intuitive and accurate, can also be used to determine specific surface area or particle size analyzer analysis and detection methods to judge.
5. Different crystal types
Due to mechanical crushing and grading of heavy calcium products, the particle shape is irregular, also known as amorphous. The particle size of precipitated calcium carbonate products is generally more regular, for example, ordinary light calcium is mainly in spindle shape, and nano calcium carbonate is mainly in cubic crystal type.
6. different performance in the application process
In the application process, heavy calcium products are mainly used in papermaking, rubber and plastic industries, filling volume is generally large, mainly as a volume filler, reduce the manufacturing cost of applied products. Light calcium products are widely applied in a wide range of fields, mainly volume filling, while nano calcium carbonate products are often used as functional fillers such as modification or reinforcement in the application process, and the filling amount is generally small. Lightweight calcium carbonate products are mainly used in plastics, rubber, coatings, adhesives and inks.