Calcium Carbonate
Also known as limestone
WHAT IS
Calcium Carbonate?
Calcium carbonate is a chemical compound. It occurs naturally in three mineral forms - calcite, aragonite and vaterite. Calcite is the most common form and is the chief component of limestone. Ground Calcium carbonate (GCC) is a white powder produced by grinding limestone Calcium carbonate and is used in many industrial applications such as flooring, roofing, decking and vinyl siding, film and food packaging, adhesives, coatings and many more.
PHYSICAL AND CHEMICAL PROPERTIES
Ground Calcium carbonate is a white, odorless powder, practically insoluble in water. GCC decomposes into calcium oxide and carbon dioxide when heated to high temperatures.
Covia’s HIFILL® grades vary in chemical and physical properties depending on the limestone source and the intended use. Each product is engineered to meet exact specifications.
Where does Calcium carbonate
Come From?
Calcium carbonate is produced from natural limestone, a sustainable resource that comprises about 15% of the Earth’s sedimentary crust. Covia has two facilities that process limestone into HIFILL ground calcium carbonate (GCC) filler: one in Huntingburg, Indiana, and the other in Apodaca, Nuevo Leon, Mexico.
Planning /
Geology
Covia’s production facilities receive limestone from nearby quarries. The calcium carbonate stone is ground into a fine powder at these Covia plants. Stones enter the rolling mill and are pulverized, passing through the machinery repeatedly until reduced to the appropriate particle size. An integrated drying system uses heat to dry the resulting powder to meet customer specifications.
Ground calcium carbonate is dried to reduce the moisture content to below 0.2%. The powder is classified to meet the target particle size and stored in silos before being bagged or shipped. Covia's Calcium carbonate product, HIFILL, is produced in multiple grades with varying median particle sizes, from 1.95 μ to 12.5 μ. The final product is shipped in 50-lb bags or by the truckload in pneumatic tankers.
During processing, the team regularly tests the product for particle size and moisture content to ensure consistency and quality. All HIFILL grades are processed strictly according to Covia QIPSM statistical and quality assurance programs. This results in chemical purity and consistently uniform particle size distributions, which ensure predictable results and reliable service.
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