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What is the difference between heavy calcium, light calcium, active calcium, and nano-calcium?

What is the difference between heavy calcium, light calcium, active calcium, and nano-calcium?

03 Jul 2021
Calcium carbonate is an important inorganic chemical product and functional powder material. Because of its unique physical and chemical properties, it is widely used in roads, building materials, metallurgy, rubber, plastics, paper making, coatings and other industries.
Types of calcium carbonate
Light calcium carbonate (precipitated calcium carbonate), referred to as light calcium, is calcined from limestone to produce lime (calcium oxide) and carbon dioxide, digested with water to form milk of lime (calcium hydroxide), and then pass carbon dioxide to form calcium carbonate precipitation. Finally, it is prepared by dehydration, drying and crushing. The sedimentation volume of light calcium carbonate is 2.4~2.8mL/g.
  Heavy calcium carbonate, referred to as heavy calcium, is a product with natural calcium carbonate minerals, such as calcite, limestone, chalk, shells, etc., processed to the appropriate particle size by mechanical methods. The sedimentation volume of heavy calcium carbonate is 1.1~1.4mL/g.
 Activated calcium carbonate, also known as modified calcium carbonate, colloidal calcium carbonate, referred to as live calcium. Surface modifier (coupling agent, stearic acid, etc.) is used to modify the surface of light calcium carbonate or heavy calcium carbonate particles. The surface-modified calcium carbonate has a reinforcing effect, which is the so-called "active" Therefore, it is customary to call modified calcium carbonate as active calcium carbonate. The activation rate of Samhar surface coating mill can reach 98%, the consumption of modifier is small, and the modification principle is advanced. It is the first-choice equipment to increase the added value of powder.

Nano-calcium carbonate, referred to as nano-calcium, is the calcium oxide obtained by calcining selected limestone by the carbonization method. The calcium hydroxide produced by digesting it is pulverized under high shear to remove impurities, and then carbon dioxide is introduced to obtain calcium carbonate. The slurry is prepared by dehydration, drying and surface treatment.


The difference between heavy calcium and light calcium

  Bulk density: The biggest difference between heavy calcium and light calcium is the difference in bulk density. Heavy calcium is larger, generally 0.8~1.3g/cm3, and light calcium has a smaller bulk density, generally 0.5~0.7g/cm3.   

Whiteness: Heavy calcium is relatively more impurity, the whiteness of the product is generally 89%~93%, rarely can reach 95% of the product. The light calcium is a chemically synthesized product that removes a lot of impurities, and the purity of the product is high. The whiteness is mostly 92%-95%, and the whiteness can reach 96%-97% or even higher.

Dry flow: From the perspective of fluidity, the microstructure of light calcium is spindle-shaped, and its oil absorption value is large, so its dry flow is obviously not as good as heavy calcium. Generally, adding more than 25 parts to the formula will improve the fluidity of the mixture. Make an impact. In comparison, heavy calcium is in irregular granular form, which promotes the fluidity of the mixture. Under the condition that some physical properties of the product are relaxed, the amount of heavy calcium added can be significantly increased. Moisture content: The moisture content of heavy calcium products is relatively low and stable at the same time, generally 0.2%~0.3%; the moisture content of light calcium is generally 0.3%~0.8%.

The difference between active calcium and inactive calcium

Hydrophobicity: After the surface of activated calcium is coated with activator, it has obvious hydrophobic properties. It can be distinguished by the condition of active calcium and inactive calcium dissolved in water.

Fluidity: The surface of active calcium is coated with organic active agent molecules with lower surface tension, and its surface energy is lower than that of non-activated calcium, and the viscosity resistance between particles is reduced, so that the fluidity of active calcium powder is significantly improved, which also marks the product The difference in dispersion (compared under the same conditions).

Particle size: As the active calcium surfactant reduces the surface energy of the particles, the agglomeration force of the particles is significantly weakened, and the particle size of the particles is significantly reduced. The difference between the two products is distinguished by electron microscopy.

Oil absorption value: Because the particle size of active calcium is reduced, the inter-particle void ratio is also reduced, making the microscopic surface of the particles smooth and flat. Therefore, the oil absorption value of active calcium is lower than that of inactive calcium.

Uses of heavy calcium powder

Fineness(mesh)
Scope of application
Recommended equipment
Below 200
Lightweight bricks, soil amendment
SHM-289/SHM-189
200~325
Desulfurization powder, construction supplies, artificial marble, glass, chalk, etc.
SHM-319/SHM-289
400~800
Rubber, plastics, sealing materials, chemical raw materials, toothpaste, etc.

SHM-319/SHM-289

1250~1500
Paint, stationery, cables, cosmetics, building materials, medicine, etc.
SHM-309/SHM-219
2000~3000
High-end paper, high-end PVC, high-end filler, high-end silicone
SHM-309/SHM-219


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