Method and system for removing vanadium impurities in titanium tetrachloride

Abstract

The invention discloses a method and a system for removing vanadium impurities in titanium tetrachloride. The system is composed of a crude titanium tetrachloride feeding tank, a feeding pump I, a forced circulating pump, a forced circulating pump groove, a heating heat exchanger, a flask tank, a purifying tower, a condensation heat exchanger, a titanium tetrachloride storage tank, a fatty acid feeding tank, a slurry tank and a feeding pump II. The method comprises the steps: adding crude titanium tetrachloride and fatty acid into the forced circulating pump groove; then, adding the crude titanium tetrachloride and the fatty acid into the heating heat exchanger to carry out reduction reaction to obtain titanium tetrachloride slurry, wherein the titanium tetrachloride slurry contains suspended dichlorooxovanadium solids; enabling the titanium tetrachloride slurry to enter the flask tank, and carrying out flask separation; discharging dichlorooxovanadium solid contained slurry into the forced circulating pump groove, and enabling gaseous titanium tetrachloride to enter the purifying tower; and discharging the dichlorooxovanadium solid contained slurry in the purifying tower into the forced circulating pump groove, and enabling the gaseous titanium tetrachloride to enter the condensation heat exchanger to obtain the vanadium removed titanium tetrachloride. The method and system disclosed by the invention have the advantages that the equipment scaling and pipeline blocking phenomena are reduced, the productivity is improved, the energy consumption is reduced, the vanadium removal efficiency is high, and the quality of a product is stable.

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...

AI Technical Summary

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

Images