What is ground calcium carbonate (GCC)

Ground calcium carbonate
(Ground calcium carbonate)

The main component of limestone is calcium carbonate, which is a sedimentary rock made of calcite or aragonite minerals. Mined limestone (calcite, limestone) is directly ground into powder to make ground calcium carbonate (GCC).

Ground calcium carbonate specification

Ground calcium carbonate (GCC) is mechanically crushed and classified, and its particles are mostly in irregular shapes such as cubes, polygons and cuboids. According to its original particle size, it is divided into coarse ground calcium carbonate (>3 µm), fine ground calcium carbonate (1-3 µm) and ultra fine ground calcium carbonate (0.5-1 µm).

Ground calcium carbonate uses

Ground calcium carbonate (GCC) is widely used in papermaking, rubber and plastic fillers, paint/coating, cosmetics, glass/ceramics, adhesives and soil additives.

Ground calcium carbonate manufacturing process

Ground calcium carbonate manufacturing process

How to make calcium carbonate from limestone? Generally, there are two ways to make calcium carbonate: dry processing and wet processing.

The most widely used is the dry processing technology, which is mainly divided into 4 stages:

Crushing stage

The large limestone mined is crushed into small particles of 15 mm-50 mm through crushing equipment (jaw crusher or hammer crusher).

Grinding stage

The small particles that meet the requirements are uniformly sent to the grinding equipment by the conveying system for sufficient grinding. Common milling equipment includes vertical mill, Raymond mill and superfine mill.

Grading stage

The ground powder is sent to the classifier by airflow for classification, the powder that meets the standard is sent to the next process, and the unqualified powder is returned to the grinding chamber for re-grinding.

Powder gathering stage

The powder that meets the standard enters the powder collection system along the pipeline. It is sent to the finished product warehouse by the conveyor and packed by the packaging machine.

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