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YuanLei little knowledge | What is the difference between different specifications of calcium carbonate
Calcium carbonate is one of the most commonly used non-metallic minerals in the chemical industry. There are many kinds of calcium carbonate, the more common ones are ordinary calcium carbonate and nano calcium carbonate. Different calcium carbonates have different specifications. What is the difference between different mesh quantities of calcium carbonate? The following Xiaobian to take you to understand.
1. From the name:
There are different names for regular grade calcium carbonate and nano grade calcium carbonate.
2. From the appearance:
When kneading nano calcium carbonate by hand, the particle is fine and smooth with strong adhesion, and the powder on the hand is difficult to wash clean, while the ordinary active calcium carbonate does not have this situation.
3. From the perspective of packing density:
The bulk density of nanometer active calcium carbonate is smaller than that of ordinary active calcium carbonate, the former is generally 0.3 ~ 0.5g/cm3, the latter is generally 0.5 ~ 0.7g/cm3.
4. From the perspective of particle size:
When the particle size range is more than 1000nm, it is normal grade calcium carbonate. When the particle size is between 100 ~ 1000nm, it is fine calcium carbonate. When the particle size ranges from 20 nm to 100nm, it is superfine calcium carbonate. When the particle size of calcium carbonate is less than 20nm, it is ultrafine calcium carbonate. Under normal circumstances, usually the super fine calcium carbonate and ultra fine calcium carbonate is also called nano calcium carbonate.
5. From the perspective of crystal type:
The crystal shape of nano-scale calcium carbonate is mainly cube, and the particle size is small and can produce chain shape, while the active light calcium carbonate of general grade is mainly spindle shape, or agglomerate into chrysanthemum-like crystals.
6. From the perspective of use:
400 mesh to 800 mesh: Used for toothpaste paste, soap, rubber, plastic, cable, PVC, whiteness above 94 degrees.
1250 mesh: PVC, PE, paint, paint grade products, paper base coating, paper surface coating, whiteness above 95 degrees. With high purity, high whiteness, non-toxic, odorless, low fine oil quality, low hardness.
Nano calcium carbonate: 80-100nm: pigment filler, calcium supplement, high purity, good whiteness, fine particle size, can replace titanium dioxide.
7. In terms of price
The price of different motifs is different, the finer the powder, the higher the whiteness the more expensive the price, and the price will be affected by the market, there is a certain fluctuation.
8. From the point of view of processing technology
Ordinary calcium carbonate: calcite, etc. - Crushing - powder (fineness according to customer demand) - finished product
Nanometer calcium carbonate: The production process is divided into five sections: raw material preparation section, calcination section, gas washing section, digestion section, pulping section, carbonization section, activation section, dehydration section, drying section and packaging section.