Explore the differentiated properties and applications of active calcium carbonate and light calcium carbonate
Explore the differentiated properties and applications of active calcium carbonate and light calcium carbonate
Calcium carbonate is a common inorganic compound that widely exists in nature and is widely used in various industrial fields due to its diverse physical and chemical properties. Among them, activated calcium carbonate and light calcium carbonate are two important calcium carbonate products. They have significant differences in production technology, physical properties and application fields.
Production process Activated calcium carbonate is mainly produced through physical methods. Its production process usually uses high-purity limestone (such as calcite, chalk, etc.) as raw materials, and refines it through physical means such as grinding. On the surface of ground calcium carbonate particles, surface treatment is performed by adding activators (such as phthalate coupling agents, stearic acid, lignin, etc.) to form a special coating structure on the surface, thus improving its Dispersion and affinity in polymer matrix.
Light calcium carbonate is produced through chemical methods. The production process involves calcining raw materials such as limestone to produce lime and carbon dioxide, then adding water to digest the lime to produce calcium hydroxide emulsion, and then introducing carbon dioxide to perform a carbonization reaction to produce calcium carbonate precipitation. After this precipitation is dehydrated, dried and pulverized, a light calcium carbonate product can be obtained.
Physical properties: The particles of activated calcium carbonate are irregular in shape and are polydisperse powders with a wide particle size distribution, and the average particle size is generally between 5-10 microns. Due to the activation treatment, its surface properties have been improved, it is extremely hydrophobic, has high whiteness, good fluidity and even dispersion. The particle shape of light calcium carbonate is relatively regular and can be regarded as a monodisperse powder. Its particle size can be very fine, such as ultrafine calcium, micro-calcium, nano-calcium, etc. The whiteness of light calcium carbonate is generally very high, the standard is usually above 90, and the sedimentation volume is high, usually above 2.5. Its average particle size is generally 1-3 microns, and its particle size distribution is narrow.
