Investigaton of the effects of micronized calcite grinding and coating operations on colour parameters

Calcite (CaCO3) is used as a mineral filler in many industries such as plastics, paper and coating because of its white colour, low iron, silica content and easy grindability after it is ground in the micron sizes. The most important property requested by users is whiteness degree of calcite products. Colour parameters (L*, a*, b*) of calcite ore may change naturally after milling and coating process. The changes and colour difference (?E) must be calculated from raw material and product. In this study; colour measurements and colour difference (?E) calculations are given for calcite ore in Nigde region.