The Difference Between GCC& PCC2021-08-09

Calcium carbonate is a common inorganic compound. Whether it is ground calcium carbonate or Precipitated calcium carbonate, it is the most widely used powder filler in plastics, rubber, paper and other industries. However, the preparation methods of the two are different, which also leads to differences in powder characteristics and application fields.

1.    Production Process

Precipitated calcium carbonate, including Precipitated calcium carbonate and nano-calcium, is generally prepared from limestone as a raw material through calcination, digestion, carbonization, separation, drying, classification, and packaging.

Grinding calcium carbonate, referred to as ground calcium (hereinafter collectively referred to as ground calcium), is made by mechanically directly crushing natural calcite, limestone, chalk, and shells. The main processes include crushing, superfine crushing, classification and surface modification.

There is no difference in chemical composition and appearance, but the characteristics and applications are quite different

2.    Mineral economics comparison

Powder preparation cost: The conventional cost is equivalent and at the same level of competition, but if the environmental control cost and resource waste rate are added, the expansion cost of Precipitated calcium is higher than that of ground calcium carbonate. Therefore, if conditions permit, choosing ground calcium is more economical and cheaper.

Environmental balance: In addition to noise, ground calcium production has no "three wastes" emissions, and the environment is easy to coordinate and control; Precipitated calcium production emits "three wastes", especially combustion exhaust gas, and the overall environmental balance is low.

Resource utilization rate: Ground calcium is easy to comprehensively utilize mineral resources, while Precipitated calcium is difficult to control the reasonable utilization rate of mineral resources due to its chemical processing ability.

3.    Industrial Application Impact Factor

smell

Precipitated calcium is mostly due to the incomplete reaction of calcium oxide, leaving a smell of lime.

Additives (such as filling biscuits) in the food industry will have a choking taste, but ground calcium does not.

PH

The pH of ground calcium is 8-9;

The pH of Precipitated calcium is 9-10.

granularity

The particles of ground calcium powder are irregular in shape, with edges and corners, rough surface, large particle size, and wide distribution. Generally, calcite powder is hexagonal crystal type, and marble powder is cubic crystal type, which is mainly related to the place of origin.

Precipitated calcium powder has a regular particle shape and can be regarded as a monodisperse powder with a narrow particle size distribution. According to different crystal grain shapes, Precipitated calcium can be divided into spindle shape, square shape, diamond shape, spherical shape and so on.

density

In industry, Precipitated calcium, ground calcium and nano-calcium carbonate are often judged initially by the difference in sedimentation volume. The larger the sedimentation volume, the smaller the product particle size, the Precipitateder the density and the higher the grade. The sedimentation volume of ground calcium is 1.1 to 1.4 ml/g, the sedimentation volume of Precipitated calcium is 2.4 to 2.8 ml/g, and the sedimentation volume of nano calcium carbonate is 3.0 to 4.0 ml/g.

BaiDu

Ground calcium products are generally made by physical crushing and grinding, with relatively high impurities, and the whiteness is generally 89% to 93%; Precipitated calcium is chemically synthesized with high purity, and the whiteness is mostly 92% to 95%.

Water content

The moisture content of ground calcium is generally 0.2%~0.3%, and the moisture content is relatively low and relatively stable;

The water content of Precipitated calcium is generally 0.3% to 0.8%, and sometimes there will be a certain fluctuation and not stable.

Oil absorption value

Due to its large particles, smooth surface, and small specific surface area, ground calcium has a low oil absorption value, generally around 40-60mL/100g;

Precipitated calcium particles are fine, the surface is rough, and the specific surface area is large, so the oil absorption value is high, generally about 60-90mL/100g.

fluidity

The microstructure of Precipitated calcium is a spindle shape, and its own oil absorption value is large, which can absorb the flow-promoting components in the formula such as lubricants, plasticizers, coupling agents, dispersants, etc., so the fluidity is not as good as that of ground calcium .

4.    Summary and application analysis

Ground calcium is mainly used in papermaking, rubber and plastic industries, and the filling amount is generally large, mainly as a volume filler, which reduces the manufacturing cost of the product;

Precipitated calcium has a relatively wide range of applications, such as plastics, rubber, coatings, adhesives, cigarette paper, inks, etc., mainly by volume filling.

From the perspectives of economy and environmental protection, the replacement of precipitated calcium carbonate by ground calcium carbonate has always been a major industry development trend, but in practical applications, the two are often complementary, and precipitated calcium carbonate in certain areas is irreplaceable. Therefore, a more in-depth understanding of the difference between the two can be more targeted at the application end to achieve a larger range of ground calcium carbonate instead of precipitated calcium carbonate.

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