Abstract: Based on the analysis of thermodynamics and kinetics of the titanium removal process from hot metal by the powders injection,a kinetic model was built to calculate the removal amounts of titanium,silicon,and carbon with the change in residence time in hot metal for different sizes of injected particles. With the help of the calculated actual residence time,it can be concluded that the particle size of titanium removal agents with a high content of iron oxide in the range of 0.5 to 0.8 mm is more suitable for titanium removal. The experiment in the induction furnace was performed to study the relationship between titanium removal and silicon removal of the titanium removal agents. The results show that titanium removal and silicon removal proceed synchronously,the related ratio of titanium removal amount to silicon removal amount is in the range of 0.8 to 1,and the removal efficiencies of titanium and silicon are both in 40%-80% after 30 min treatment. It is found that in the industrial practice,the particles injection with a high content of iron oxide as the titanium removal agent should be chosen firstly and the optimal effect can be attained.