A kind of method and system for removing vanadium impurity in titanium tetrachloride

Abstract

A method and system for removing vanadium impurities in titanium tetrachloride. The system consists of a crude titanium tetrachloride feed tank, a feed pump I, a forced circulation pump, a forced circulation pump tank, a heating heat exchanger, a flash tank, Purification tower, condensing heat exchanger, titanium tetrachloride storage tank, fatty acid supply tank, mud tank and feed pump II, the method is: put crude titanium tetrachloride and fatty acid into the forced circulation pump tank, and then pump into the heating heat exchanger for reduction reaction, and the obtained titanium tetrachloride slurry containing vanadium oxychloride solid suspension enters the flash tank for flash separation, and the solid slurry containing vanadium oxychloride is discharged to the forced circulation pump tank, and the gaseous tetrachloride Titanium chloride enters the purification tower; the solid slurry containing vanadium oxychloride in the purification tower is discharged to the forced circulation pump tank, and gaseous titanium tetrachloride enters the condensing heat exchanger to obtain titanium tetrachloride with vanadium removed. The advantages are: reducing equipment fouling and pipeline blockage; increasing production capacity, reducing energy consumption, high vanadium removal efficiency, and stable product quality.

Description

technical field [0001] The invention relates to a method and system for removing vanadium impurities in titanium tetrachloride. Background technique [0002] Titanium tetrachloride is the main raw material for producing sponge titanium and titanium dioxide. The quality of titanium tetrachloride will directly affect the quality of sponge titanium and titanium dioxide. Usually, vanadium exists in the form of vanadium oxytrichloride in titanium tetrachloride, and its boiling point is slightly lower than that of titanium tetrachloride. It is difficult to remove vanadium in crude titanium tetrachloride by distillation. [0003] At present, the crude titanium vanadium removal process mainly includes aluminum powder method, hydrogen sulfide method, copper wire method and organic matter method. Organic matter removal of vanadium, the process operation is relatively stable, and it is relatively easy to implement. It has been widely promoted at home and abroad in recent years, especi...

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Problems solved by technology

In China, although the process has been continuously optimized in recent years, steam consumption has also been reduced to a certain extent, but with the expansion of the overall production capacity of titanium dioxide, the production equipment for removing vanadium from mineral oil occupies a large area, the production capacity is low, and the consumption of steam is high. The contradiction between the production capacity mismatch between the front and back processes has become increasingly prominent

[0004] Mineral oil removes vanadium, the chemical reaction efficiency is low, when the production capacity increases, the vanadium removal index is unstable, and the use of mineral oil is high, it is easy to block the pipeline and heat exchanger, resulting in unstable production

For the removal of vanadium from organic matter, in order to ensure the stability of the vanadium removal index, it is necessary to ensure that the liquid in the reaction system has a certain solid content to operate. The production process in the industry uses a heating coil to exchange heat with the liquid titanium tetrachloride in the kettle. Fast, low heat transfer efficiency, short operating cycle

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