Contract Code 77/087
 Measurements and calculations shows that on the average about 3000 tons P2O5 is wasted yearly in phosphoric acid evaporators system of the complex because of carry over phenomena. This problem was investigated and analyzed after sampling, submitting a simple statical model and computerized – technical calculations. A coefficient is submitted without dimension which has an optimum usage for analyzing and controlling carry over phenomena in evaporator system and flash vaporization. On the basis of mentioned properties variations some curves are submitted for optimum controlling of unit’s processing conditions. In order to reduce the P2O5 loss, a periodic table is submitted to perform the boil – out operations for any kind of phosphate soil which has been used practically the operation o unit