Calcium carbonate is used as an additive in the production of paper and some other production processes. The aim of this study was to determine the chances of the calcite sample to be mechanically cleaned of impurities so that the material can become commercially interesting, primarily to be sold to the paper and other-related industries. A mineralogical petrographic investigation carried out on a sample of calcite showed that an unfavorable impurity is, in particular, graphite – which is otherwise fairly easily to remove with the process of flotation. A flotation procedure was performed with samples of different granulations. The purpose of this was to find an optimal granulation for carrying out the flotation. In order to achive an effective flotation it is first necessary to achieve the proper liberation of grains. The second part of the study was to explore the optimal sequencing of treatment procedures for tested calcite, using milling, flotation, and sedimentation.