Minerals fillers offer cost reduction – and sometimes enhanced properties to polymer formulation. calcium carbonate changing role in the growing polymer market
It is estimated about 5% of the earth’s crust is some form of calcium carbonate either as calcite , limestone,chalk,marble,or aragonite or through impure forms like dolomite, while some minor portion of naturally occurring calcium carbonate have have formed due to geological processes the majority has its origins from animal life.
calcium carbonate is the main constituent of shells of marine animals and exoskeletons of myriad creatures , which gradually accumulated on the sea floor over many eons later transformed by inexorable geological processes to form the mighty Himalayas , the ionic white cliffs of Dover and many other calcium carbonate deposits worldwide. Calcium carbonate is one of the most useful minerals and has been used by mankind for 40,000 year for a wide range of applications.
Mining & Production
The vast majority of calcium carbonate used in industry is extracted by mining or quarrying.Pure calcium carbonate(eg. for food or pharmacetical use) can be produced from a pure quarried source (usually marble). The mined minerals are ground into fine powdersand classified according to particle size(Ground calcium carbonate-GCC) The purity is very much dependant of the quality of the mine deposits.
Ultrafine particle size grades are termed as fine ground calcium carbonate(FGCC).
Alternatively calcium oxide is prepared by calcining crude calcium carbonate.