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Discussion on restoring method of titanium alloy bar feeding

From both titanium alloy bar feed law to speak of. When the reactor heat to proper temperature, reactant and according to the established ratio of sodium and Titanium tetrachloride feed. In the General case, for the purposes of preparation of titanium alloy bars step, instantaneous molar ratio is Na:TiCl4=4 continuous feed feed, reaction of titanium and NaCl. When the temperature is low or matching is not appropriate, and titanium dichloride and Titanium trichloride are stable, as the reaction proceeds, melting gradually accumulated in the body by a complex system of TiCl4-Na-Ti-NaCl-TiCl2-TiCl2.

Initial temperature is lower, after joining the reaction mass, material mixing liquid contact time (TiCl4)-liquid (Na) response; after the TiCl4 endothermic gasification, and there is a gas (TiCl4)-liquid (Na) phase. Product is Ti and titanium, Titanium trichloride mixture, temperature rises titanium dichloride and Titanium trichloride and continues to be restored by residual sodium.

In the course of normal response, and general maintenance of the melt temperature > 800 ℃, the various components in addition to titanium alloy bars are liquid. According to their share of their natural layering. Titanium alloy bar to the most, build integrated titanium of titanium alloy bar goes down to accumulate lump. The specific gravity of the liquid sodium, iron walls, poor wettability of titanium alloy bars and NaCl, so easy to automatically float NaCl surface liquid exposed to melt a large proportion, sedimentary down, gradually accumulating occupy the lower part of the reactor volume except titanium alloy bars.

At the same time when feeding, plus jitter impact, fall melt of sodium and Titanium tetrachloride, molten liquid sodium is quickly rising to the surface, and TiCl4 at low temperature than liquid sodium, only gradually after the heat escape melt and vaporize the surface to float. At this point on the surface of the melt to gas (TiCl4)-liquid (Na> facies of the reaction. Due to the violent response, reaction temperatures above the boiling point of sodium in area (>10000C), when the reduction is on the surface of boiling of liquid sodium. Will always be some sodium under high temperature gasification on Rong surface gas (TiCl4)-gas (Na) the phase response. In addition, at the time of contact between the melt liquid materials liquid (TiCl4)-liquid (Na) the phase response.

Throughout the process of family, because of the reactant is added one by one reactor, and surface of the melt. Generate a lump-shaped titanium alloy deposited on the lower part of the reactor, under normal circumstances is not going to take the "bridge". Na, NaCl specific gravity difference, NaCl molten salt deposition in the lower part of the reactor. Therefore, way short of the contact between the reaction of TiCl4 with sodium, diffusion speed, can keep a larger reaction rate until late reaction. Due to the large temperature gradient melt and a concentration gradient, wave fluctuations of impact melt, as well as slow melt flow, speeds up the expansion process, helps to improve the speed of response.