Calcium Carbonate (GCC)

In the production of ultrafine calcium carbonate additives, various aspects must be considered when selecting and deciding among available types of processing systems: 

Fineness range, annual output (uncoated and coated GCC), dry or wet grinding, specific energy consumption, investment costs, plant engineering, running costs and logistical aspects.

Continuous development enables today 's ball mill – classifying systems to cover a wide capacity and fineness range of d₉₇ = 5 - 45 μm. Vertical Dry Agitator Ball Mills, such as the ATR System, are used for the energy-efficient production of GCC powders in the range of d₉₇ = 2.5 μm to 10 μm in the field of low to medium capacities. Greater finenesses up to d₉₇ = 1.6μm, especially at high outputs, are most efficiently produced by vertical wet mill systems such as the ANR-CL and either used directly as a slurry in the paint or paper industry or by means of an Atritor Cell Mill in a single process step dried, optionally coated and top cut cleaned by means of an integrated air classifier.

Dry processed GCC powder for the plastics industry achieves the highest quality available in the market by coating in a fully optimized Contraplex pin mill system with feed powder heating and top cut control by an MS-classifier with less than a few ppm residues on a 20 μm wet sieve.