Abstract
The dissolution process for natural single fluoro- apatite (FAP) crystals is studied in phosphoric acid solutions, containing the main inorganic impurities present in the industrial wet-process phosphoric acid production. A special flow device providing constant dissolution conditions was used for this purpose. The device gave the possibility to obtain new inform- ation about the dynamics concerning shape and size of each individual FAP crystal during its dissolution. Dissolution rates for the FAP crystals were measured under various conditions. The process of epitaxial coating of the FAP crystal surface by CaS04. 0.5 H,O was also studied. Without coating formation the single FAP crystals always dissolved with continuously increasing rates for all crystal faces. The meas- ured values of dissolution rates are applied to computer simulation of industrial reactors.
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