Abstract <p>A new mathematical model of evaporation and crystallization of a droplet of salt solution is proposed. By taking into account the nonuniformity of the solution’s concentration inside the droplet, the model allows us to describe the process of intensive evaporation, accompanied by the formation of a crystalline crust on its surface. The use of the given form of the concentration profile makes the model quite simple and, as a result, attractive for implementation in numerical calculations of aerosol dynamics. The model’s predictions are compared with experimental data on the intensive evaporation of a droplet of sodium chloride solution, which show good qualitative and quantitative correspondence between the measured and calculated characteristics.</p>