Calcium carbonate light and calcium carbonate heavy are all calcium carbonate, which are commonly used in coatings, plastics and other industries. The content of the first grade product is 99.1%, and the content of the second grade product is 97.9%. The difference between the heavy calcium carbonate and the light calcium carbonate is as follows:

　　1. The main difference is the use of different light calcium for fillers, welding electrodes, organic synthesis, etc., heavy calcium for the production of anhydrous calcium chloride, sodium dichromate, cement and so on. In the application process, heavy calcium products are mainly used in the papermaking, rubber and plastic industries. The filling amount is generally large, mainly as a volume filler, which reduces the manufacturing cost of the applied products. Light calcium products have a relatively wide range of applications, 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. The main application areas of light calcium carbonate products are plastics, rubber, paints, adhesives and inks.

　　2. Ground calcium carbonate or heavy calcium carbonate is natural calcium carbonate, which is obtained by crushing calcite. It is cheap and easy to settle in latex paint compared with light calcium carbonate. The particle size of heavy calcium products ranges from 0.5 to 45 um. The smaller the particle size of the product, the higher the price. There is no industrially produced nano-scale heavy calcium, but only some fine calcium products contain a very small particle size of about 100 nm. . Precipitated calcium carbonate is also called precipitated calcium carbonate. The particle size is lower than that of calcium carbonate. The oil absorption is larger than that of calcium carbonate. The price is higher than that of calcium carbonate. They are all commonly used fillers in latex paints and are best used together.

　　3. The difference in bulk quality The most obvious difference between heavy calcium and light calcium is that the bulk density of the product is different. Generally, the bulk density of heavy calcium products is 0.8~1.3g/cm3, while the bulk density of light calcium products is small. Mostly 0.5~0.7g/cm3, the packing density of some nano calcium carbonate products can reach about 0.28g/cm3. The packaging volume of the product can also roughly distinguish the heavy calcium and light calcium products. Generally, the heavy calcium products are mostly 25kg/bag, the product packaging volume is small, and the packaging volume of the same quality light calcium product is obviously larger, some nano calcium carbonate. The product is also available in 15kg/pack or 20kg/pack.

　　4. Whiteness Because heavy calcium products have relatively large impurities and large particles, the whiteness of products is generally 89%~93%, and very few products can reach 95%.

　　The lightness of light calcium products is mostly 92%~95%, and some products can reach 96%-97%, which is the main reason why light calcium products are mostly used for filling high-grade or light-colored products.

　　5. Moisture, heavy calcium products have low moisture content and are also relatively stable, generally 0.2% to 0.3%. Some high-grade heavy calcium products can reach about 0.1% moisture. Ordinary light calcium products have a moisture content of 0.3% to 0.8%, and sometimes there will be some fluctuations. Nano-CaCO products vary with the type of product used. Some products have a moisture content below 0.1, while some products have a moisture content of about 1.5%.

　　6. Different particle size and crystal form

　　A, different particle sizes

　　The particle size of heavy calcium products ranges from 0.5 to 45 um. The smaller the particle size of the product, the higher the price. There is no industrially produced nano-scale heavy calcium, but only some fine calcium products contain a very small particle size of about 100 nm. . The particle size of ordinary light calcium products is generally 0.5~15um, and the particle size of nanometer calcium carbonate is generally 20~200nm. The method of identification can be detected by transmission or scanning electron microscopy, which is more intuitive and accurate, and can also be judged by using specific surface area measurement or particle size analyzer analysis.

　　B, different crystal forms

　　Due to the mechanical pulverization and classification, the heavy calcium products are irregular in shape, also called amorphous. The particle size of the precipitated calcium carbonate product is generally relatively regular, such as ordinary light calcium with a spindle shape for the main, and nano calcium carbonate with a cubic crystal form.