Will the enterprises that produce sponge titanium use magnesium ingots?
Can be used, or can not be, according to process methods and the production of sponge too, one way is to use magnesium reduction method
The essence of magnesium reduction is at 880 DEG ~950 DEG under argon atmosphere, let four titanium chloride and magnesium were obtained by the reaction of sponge titanium and magnesium chloride, magnesium chloride removal in titanium sponge and excess magnesium by vacuum distillation to obtain pure titanium by distilled condensate molten metal recovery magnesium, magnesium chloride by molten salt electrolysis recovery of magnesium and chlorine. The process of producing titanium from refined four titanium chloride is divided into two steps: reduction and distillation. For a long time, reduction and distillation are all step by step, but now they are tending to be combined and large-scale.
In the process of reduction, trace impurities in TiCl4 such as AlCl3, FeCl3, SiCl4 and VOCl3 are reduced by magnesium to form corresponding metals. These metals are all mixed with sponge titanium. Impurities such as potassium, calcium and sodium, which are mixed with magnesium, are also reducing agents. They reduce TiCl4 and produce the corresponding impurity chlorides respectively. Magnesium reduction process includes: TiCl4 liquid, gas and liquid gasification TiCl4 Mg diffusion of TiCl4 and Mg molecules adsorbed on the active center, in the active center of chemical reaction, nucleation, crystal growth, titanium MgCl2 desorption, diffusion MgCl2. The key step in this process is crystallization nucleation, accompanied by heterogeneous nucleation with chemical reactions.
