The method of producing titanium carbide

 

(57) Abstract:

The invention relates to the metallurgy of refractory compounds, namely the method of producing titanium carbide, including the recovery of a mixture of titanium tetrachloride and carbon. This recovery of lead magnesium in the reactor serves a mixture of chlorides of titanium and carbon, cooled to (-5) - (-20)oC. the Technical result is homogeneous titanium carbide with a maximum content of fixed carbon. table 1.

The invention relates to the metallurgy of refractory compounds, rare, and transition metals, in particular metallurgy titanium.

Known methods for producing refractory compounds by restoring titanium dioxide carbon (Cypress S. C. , Levinsky Y. C., Petrov A. P. titanium Carbide. M, Metallurgy, 1989).

According to prototype the process of obtaining titanium carbide is carried out in a plasma at high temperatures, the composition of the reaction mixture includes chlorides of titanium and carbon, and hydrogen (Cypress S. C., Levinsky Y. C., Petrov A. P. titanium Carbide. M, Metallurgy, 1989. S. 7).

The disadvantage of this method is the fact that when applying a mixture of chloride in plasma chemical reactant enters the mix, depleted in carbon tetrachloride, and the magnesium reduction is formed of non-stoichiometric titanium carbide. Sooty carbon, which is formed by the disproportionation titanium tetrachloride, loses its activity and does not enter into the reaction and is removed from the reaction space. The end result is the titanium carbide with a low content of fixed carbon.

The purpose of the invention is to obtain a homogeneous titanium carbide with a maximum content of fixed carbon.

The task is solved by magnesium reduction of a mixture of chlorides of titanium and carbon, cooled to (-5) - (-20)oC.

The essence of the proposed method is as follows: when the joint for magnesium recovery chlorides of titanium and carbon are formed the source components, the surface of which is "nuclear clean, free from impurities and is characterized by high reactivity. Due to the small distance between the molecules in the original mixture of TiCl4and CCl4the formation of titanium carbide proceeds vigorously at the atomic level. The supply of liquid mixtures at low temperature the initial reactants in the reaction zone in a predetermined ratio, so you can get the titanium carbide stoichiometric composition with a maximum concentration of fixed carbon and excludes the presence of free carbon.

The choice of process parameters attributable to the following: in the case of the filing of the original mixture of chlorides at temperatures above -5oC carbon tetrachloride will disproportionality before coming in contact with the metal magnesium, the resulting sooty carbon is withdrawn from the reaction zone, in addition, it is passivated; the end result is a non-stoichiometric carbide composition containing an increased amount of free carbon. When applying mixtures of chlorides at temperatures below - 20oC will be unnecessary energy consumption for cooling the mixture, and crystallization of the individual components that will result in a heterogeneous material with a high content of free carbon.

Example. The laboratory setup consisted of a shaft electric furnace, sealed reactor and glass, and a capacitor (for vacuum separation of the reaction mass). The mixture of chlorides of titanium and carbon were placed in a special thermostat, where it was cooled to (-5) - (-20)oC with constant stirring magni is carried out applying a mixture of chlorides of titanium and carbon. The process temperature was maintained in the range of 800-900oC. utilization of magnesium 35-50%. After the filing of the chlorides produced extract and cooled reactor. After installing the capacitor was carried out by vacuum separation at a temperature of 960-980oC. the resulting products were cooled, the apparatus was dismantled. Titanium carbide is crushed and analyzed. The results are shown in the table.

The data obtained allow us to conclude about the technical effect of the invention, when applying a cooled mixture of the chlorides of titanium and carbon is obtained carbide with a high content of fixed carbon, homogeneous composition.

The method of producing titanium carbide, including the recovery of a mixture of titanium tetrachloride and carbon, characterized in that the recovery of lead magnesium in the reactor serves a mixture of chlorides of titanium and carbon, cooled to (-5) - (-20)oC.

 

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