Understanding Calcium Carbonate: Comprehensive Analysis of 17 Differences between Light Calcium and Heavy Calcium-2
5. Moisture content
The moisture content of heavy calcium products is low and stable, generally 0.2% to 0.3%, and high-end products can even reach about **0.1%**, showing good stability.
The moisture content of ordinary light calcium products is relatively high, usually between **0.3% and 0.8%**, and the moisture content will fluctuate to a certain extent, and the stability is poor.
6. Particle shape
The shape of heavy calcium particles is irregular, multi-angular, rough on the surface, with a wide particle size distribution and a large particle size. At the same time, the crystal form of heavy calcium is affected by the source of the ore. Most calcite heavy calcium is hexagonal, and marble heavy calcium is cubic. Its crystal form will not change during the crushing or refinement process.
The shape of light calcium particles is regular and can be regarded as monodisperse powder, with a relatively narrow particle size distribution. According to the shape of the grains, light calcium can be divided into a variety of crystal forms:
Spindle shape: The average long axis particle size is 5 to 12μm, and the short axis particle size is 1 to 3μm.
Cubic: average particle size is 0.02-0.1μm.
Needle-shaped: average particle size is 0.01-0.1μm, aspect ratio is 5-100.
Chain-shaped: average particle size is 0.01-0.1μm, aspect ratio is 10-50.
Spherical: average particle size is 0.03-0.05μm.
Flake: average particle size is 1-3μm.
7. Taste
Light calcium: Due to incomplete reaction of calcium oxide, light calcium may have residual lime taste. In food applications (such as filling biscuits), it will produce a choking taste.
Heavy calcium: It has no odor at all and is more suitable for food and other fields that are sensitive to odor.
8. Particle size
Heavy calcium carbonate:
The particle size range of heavy calcium carbonate products is relatively wide, ranging from 0.5 to 45μm, and can be specifically divided into:
Coarsely ground calcium carbonate (d > 3μm)
Finely ground calcium carbonate (d = 1 to 3μm)
Ultrafine calcium carbonate (d = 0.5 to 1μm)
Light calcium carbonate:
Light calcium carbonate has a fine particle size and is divided into the following categories according to the original average particle size (d):
Microparticle calcium carbonate (d > 5μm)
Micropowder calcium carbonate (d = 1 to 5μm)
Fine calcium carbonate (d = 0.1 to 1μm)
Ultrafine calcium carbonate (d = 0.02 to 0.1μm)
Ultrafine calcium carbonate (d < 0.02μm)
