Studies of the process of chlorination of baddeleyite concentrate in the KCl melt, the ratio of melt : charge (5 : 1) were carried out. It has been established that the limiting stage of the process at temperatures below 800 °C is a chemical reaction, and at higher temperatures it is the rate of diffusion processes. As a result of the work, the optimal chlorination temperature range of 880 - 950 °C was determined, while the degree of chlorination of the concentrate is more than 96 %.