[en] The use of calcium oxide as a fixative for phosphorous in the slurry combustion of tributylphosphate/dodecane mixtures has been verified by the experiments documented in this thesis. The concluding results are as follows: when using CaO as a fixative in a tributylphosphate/dodecane/CaO slurry spray flame, over 200% stoichiometric CaO, assuming 3Ca.P₂O₅ as the product, must be used to have full conversion of phosphoric acid to calcium phosphate. Vaporization time of the droplet will decrease when the droplet size decreases, which allows longer reaction time between the calcium oxide and the phosphoric acid. The minimum travel time for the gas in the present experimental pilot incinerator to have almost complete conversion to calcium ortho phosphate is around 2 seconds. To further this work more kinetic experiments must be performed to verify that the TBP thermally degrades in the gas phase. Also, more work must be done on the reaction between the gaseous phosphoric acid and the solid calcium oxide to achieve optimal operating conditions