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.