Limestone, which is primarily calcium carbonate, is a sedimentary rock made up of the minerals, calcite or aragonite. A substantial portion of limestone is from the skeletal remains of sea creatures and organisms. Ground Calcium Carbonate (GCC) differs from Precipitated Calcium Carbonate (PCC) in that the GCC is formed directly from grinding limestone rock into a powder, while PCC is chemically produced and precipitated out as powder.
Ground Calcium Carbonate is used in paper and plastic fillers, coatings and paints. It is also used in cement, and can be converted to quick-lime (calcium oxide) and slaked lime (calcium hydroxide). Ground calcium carbonate is slightly basic and can be used to neutralize combustion vapors or increase the pH in water or soils.
Pure calcium carbonate is a relatively soft mineral/compound, with a Mohs hardness of 2.5 – 3.0. However, mined limestone may have a minor portion of abrasive impurities such as quartz / sand.
HCPS offers processing services for the size reduction of Calcium Carbonate with Mikro ACM milling systems. These systems can produce Calcium Carbonate from (100 mesh) products down to a fineness of 635 mesh or 20 µm. product or a D50 of less than 5 µm.
An alternate to the ACM for coarser grade Calcium Carbonate is the Mikro Pulverizer Hammer & Screen Mill. The Pulverizer can produce a variety of products from 50 mesh to 150 mesh.