Calcium carbonate


Calcium carbonate is a natural mineral in the earth’s crust; on the basis of the industrial point of view, it could be classified into three main groups of materials as follow:

  • Powdered or micronized calcium carbonate (gcc), which is also called natural calcium carbonate.
  • Precipitated calcium carbonate (pcc)
  • Coated Calcium Carbonate

In the present project, the micronized calcium carbonate as products of the factory is introduced.

Difference between gcc and pcc


The chemical composition of these two products is the same; the purity of pcc is more and the amount of silica and lead is less in it; the shape and size of the pcc particles differ from gcc ones; the particles shape of the gcc are often rhombohedral, while the particles shape of the pcc depends on the method of process controlling; and uniformity and particles sorting are more in pcc.

The variance of the gcc particle size is more, thus, very coarse to very fine particles could be seen, and as well, the largest particles of gcc are much larger than the largest particles of pcc. The pcc enhances the plastics resistance, and the size variance of pcc particles increases its oil absorption capacity for specific applications.

Coated calcium carbonate


A Coated calcium carbonate is a usual one which is coated with a thin layer of stearic acid (which is a fatty acid). The consumption value of this kind of acid is between 0.5 and 3 weight percent. The coated calcium carbonate with a lubrication property acts as a waterproof layer. The acid type is different in rubber or plastic industries. Some benefits of using the coated calcium carbonate are the impressive reduction in oil absorption and reduction of particles accumulation in spite of maximum filling of empty spaces. The calcium carbonate gets coated with stearic acid and releases in various grain sizes.

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