Feeding method of reducing titanium rod

Start feeding method while reducing titanium alloy bar talk. When the temperature in the reactor to a suitable temperature, the reaction was the addition of titanium tetrachloride and sodium while the established ratio. In general, in order to achieve further object of preparing titanium rod, it is based on the instantaneous molar feed ratio of Na: TiCl4 = 4 continuous feeding of the reaction of titanium and NaCl. When the ratio is low or inappropriate temperatures, as well as titanium dichloride and titanium trichloride is stable, as the reaction proceeds, gradually accumulated by TiCl4-Na-Ti-NaCl-TiCl2-TiCl2 composition of the melt The complex system.
Generally the lower the initial reaction temperature, after adding material when the material contacting the liquid mixture (TiCl4) - liquid (Na) phase reaction; TiCl4 endothermic gasification rear part, while there is a gas (TiCl4) - liquid (Na ) phase reaction. Ti and which product is titanium chloride, a mixture of titanium trichloride, the temperature rises titanium dichloride and titanium trichloride and continues to be the reduction of the residual sodium.
In the normal course of the reaction, generally maintain the melt temperature> 800 ℃, the ingredients are in addition to the TC Titanium rod outer liquid phase. They can share their natural stratification. The largest proportion of the resulting deposited Titanium tube fittings downward titanium rods gathered into a lump. A small proportion of liquid sodium, iron wall, titanium rods and NaCl poor wetting unit, it is easy to automatically go up the melt surface was exposed to a larger proportion of NaCl, deposited down, gradually accumulated to occupy the lower part of the reactor in addition to titanium rod other than volume.
In addition at the same time, by adding jitter can impact, titanium tetrachloride and sodium fall within the people melt, liquid sodium and soon float to the surface of the melt, and TiCl4 at low sodium weight ratio was only gradually after the heat float and escape the melt surface gasification. In this case the surface of the melt with gas (TiCl4) -. Liquid (Na> facies violent reaction due to the reaction temperature of the reaction zone centered over sodium boiling point (> 10000C), this time the reduction in boiling liquid sodium surface at high temperature gasification will always be some sodium, so the surface is also engaged Rong gas (TiCl4) -.. gas (Na) of the phase response Moreover, the liquid material in contact with each other inside the melt Shi conducted a liquid (TiCl4) - liquid (Na) of phase response.
Throughout Araliaceae process, since the reactants are successively added to the reactor, and in the surface of the melt. The resulting titanium rods deposited in the lower part of the reactor was shaped lump, under normal circumstances would not take the "bridge". Na, NaCl large difference in specific gravity, NaCl molten salt easily deposited in the lower part of the reactor. Therefore, ways and sodium reactants TiCl4 contact with each other is short, diffusion speed, to maintain a large reaction speed, until the latter part of the reaction. Since the melt temperature gradient in the larger memory and concentration gradients of the wave Shocks melt occurs and the melt flow of memory in the slow, have accelerated enlarge the process, help to improve the response rate.
Reactions produce mainly titanium, were generated TiCl2 or TiCl3, they are dissolved in liquid NaCl, different reaction rate, the resulting titanium rods are not the same. Direct reaction of titanium particles small, and rely on the melt titanium diffusion results in larger particles, and some crystalline titanium.