China Nonferrous Metallurgy

In view of the disadvantages of water quenching treatment of liquid phosphorus slag in industrial production of yellow phosphorus at present, the wind quenching method is used to treat liquid phosphorus slag and the numerical simulation of the wind quenching process is carried out. Based on the FLUENT simulation method, a finite element simulation model was established to simulate the process of liquid phosphorus slag treated by wind quenching technology, and the influencing factors of wind quenching process and the solidification heat transfer law of slag particles were analyzed. The results show that when the air velocity is relatively high, the diffusion speed of slag particles is fast, the temperature distribution in the granulation chamber is uniform, and the layout of the granulation chamber is more reasonably utilized. Moreover, the average outlet temperature is higher, the energy contained in the hot air is greater, and more energy can be utilized in the heat recovery stage. When the angle of the nozzle in the granulation chamber with the horizontal plane is 30°, the air quenching and granulation effect is better than that at 0°; when the angle is 60°, it is restricted by the structure of the granulation chamber, leading to slag particles flying out from the air outlet. The solidification process of liquid phosphorus slag droplets proceeds unevenly, and the thickness of the formed slag shell is also uneven. It provides a theoretical basis and guidance for optimizing the treatment of liquid phosphorus slag by air quenching and realizing the recovery of air quenching waste heat.