Yuan Lei's Little Knowledge | (I) of Difference between Light Calcium Carbonate and Heavy Calcium Carbonate
According to the different production methods of calcium carbonate, calcium carbonate can be divided into heavy calcium carbonate, light calcium carbonate, colloidal calcium carbonate and crystalline calcium carbonate. Let's take a look at the difference between heavy calcium carbonate and light calcium carbonate.
heavy calcium carbonate
Heavy calcium carbonate, referred to as heavy calcium. In coatings, paint, paper, construction, plastics, rubber and other industries.
Light calcium carbonate
Light calcium is light calcium carbonate, also known as precipitated calcium carbonate, referred to as light calcium. It can be used as a filler in rubber, plastic, paper, paint and ink industries. Widely used in organic synthesis, metallurgy, glass and asbestos production.
1. Different sources:
Light calcium carbonate: limestone raw materials are calcined to generate lime and carbon dioxide, and then water is added to digest lime to generate lime milk. Its main component is calcium hydroxide, and carbon dioxide is introduced into carbonized lime milk to generate calcium carbonate precipitate, which is dehydrated, dried and crushed, or sodium carbonate and calcium chloride are subjected to double decomposition reaction to generate calcium carbonate precipitate, which is dehydrated, dried and crushed.
Heavy calcium carbonate: It is made by directly crushing natural calcite, marble, chalk, shells, etc. by mechanical methods.
2. Bulk density is different
The most obvious difference between heavy calcium and light calcium lies in the different bulk density of the products. The bulk density of heavy calcium products is relatively large, generally 0.8~1.3g/cm3. However, the bulk density of light calcium products is relatively small, mostly 0.5~0.7g/cm3. Heavy calcium and light calcium products can also be roughly distinguished from the packaging volume of the products. Generally, heavy calcium products are mostly 25 kg/bag, and the packaging volume of the products is relatively small, and the same quality of light calcium product packaging volume is significantly larger.
3, the size of different whiteness
Because heavy calcium products have more impurities, the whiteness of the products is generally 89% ~ 93%, and very few products can reach 95%. However, light calcium products are made by chemical synthesis, which removes many impurities and has high purity, so the whiteness is mostly 92% ~ 95%, and some products can reach 96% ~ 97%. This is also the main reason why light calcium products are mostly used for filling high-grade or light-colored products.
4. Different moisture content
The moisture content of heavy calcium products is generally 0.2%~ 0.3%, and the moisture content is relatively low and stable at the same time. The moisture content of some high-grade heavy calcium products can even reach about 0.1%. Ordinary light calcium products moisture 0.3%~ 0.8%, sometimes there will be some fluctuations are not stable. Traditionally, the distinction between heavy and light calcium is to test water with a water instrument. Light calcium is when the water content is as large as close to 1%, and heavy calcium is when the water content is as small as below 0.1.
5. Different particle sizes
The particle size of heavy calcium products ranges from 0.5 to 45um, and the particle size of the products varies with different crushing equipment. The particle size of ordinary light calcium products is generally 0.5 ~ 15um, because the particle shape is spindle shape, it is difficult to accurately determine, it is generally a range; the particle size of nano calcium carbonate in light calcium is finer, and the size is generally 20 ~ 200nm. The particle size of ordinary light calcium carbonate is generally about 2500 mesh, which can meet the performance needs of PVC pipes and profiles. Therefore, light calcium carbonate is traditionally selected for PVC pipes and profiles from the particle size. In the past, due to the limitation of crushing equipment, heavy calcium carbonate could not reach this fineness. Now the particle size of heavy calcium carbonate can fully meet the needs, even finer than light calcium carbonate, so now both PVC pipes and profiles can be selected.
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Kaolin is a non-metallic mineral, which is a kind of clay and clay rock mainly composed of kaolinite clay minerals. Because it is white and delicate, also known as white earth. It is named after Gaoling Village, Jingdezhen, Jiangxi Province.
Barium sulfate is based on barite as the main raw material, through beneficiation, ore washing, crushing and other processes. Barium sulfate has a hardness of 3~3.5 (Mohs) and a specific gravity of 4.3~4.7. It has the characteristics of high specific gravity, low hardness and brittleness. Barite is almost insoluble in water, ethanol and acid, soluble in hot concentrated sulfuric acid. With the development of some high-performance barium sulfate products, the application field of barium sulfate is constantly expanding.