Abstract：Light calcium carbonate has good applicability because it can adjust the particle crystal shape according to different application requirements
Light calcium carbonate: also known as precipitated calcium carbonate, referred to as light calcium, is to burn limestone and other raw materials to generate lime and carbon dioxide, add water to digest lime to generate lime milk (the main component is calcium hydroxide), and pass into carbonized lime milk to generate carbonic acid. Calcium precipitate, obtained by dehydration, drying and pulverization.
Production Method Of Traditional Light Calcium Carbonate
The traditional production process of light calcium carbonate in the industry uses limestone as the raw material, and the limestone is calcined at more than 900 ℃ to generate quicklime and release CO2. Its production process is: lime satin burning - slaked lime digestion - lime milk carbonization - solid-liquid separation - drying - packaging. The main chemical reactions are as follows:
Limestone is calcined to release
CO2 CaCO3→CaO+CO2
Lime (calcium oxide) reacts with water to form slaked lime
CaO+H2O→Ca(OH)2
CO2 is injected into slaked lime, and the reaction generates light calcium carbonate Ca(OH)2+CO2→CaCO3+H2O
Light calcium carbonate has good applicability because it can adjust the particle crystal shape according to different application requirements; due to the large sedimentation volume or small bulk density, the volume of the product can be increased under the same filling amount; due to less impurities, the color difference of the product is uniform; However, due to the large specific surface area and oil absorption value, the resistance when mixed with resin is large (difficult to mix).
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