Vanadium removing system and method for crude titanium tetrachloride refining

Abstract

The invention provides a vanadium removing system and a vanadium removing method for crude titanium tetrachloride refining. The vanadium removing system comprises a vanadium removing refining tower, a crude titanium tetrachloride storage tank, a titanium tetrachloride steam generation device, an organic matter vanadium-removing reagent adding device and a condenser, wherein a slurry outlet in the bottom of the refining tower is connected with a chlorination system or a residue vanadium-extracting system. The vanadium removing method comprises the following steps: removing vanadium by using an organic matter vanadium-removing reagent, discharging out precipitate generated in vanadium removing reaction and vanadium-containing slurry formed by high boiling point compounds generated in a refining procedure from a slurry outlet in the bottom of the refining tower, and directly conveying the vanadium-containing slurry into the chlorination system or the residue vanadium-extracting system without being fed back to the vanadium removing system. According to the vanadium removing system and the vanadium removing method, adverse effects of the vanadium-containing slurry on the vanadium removing system can be effectively avoided, and thus the vanadium removing system can operate continuously and is high in vanadium removing efficiency.

Description

technical field [0001] The invention relates to the field of refining titanium tetrachloride, and more specifically, relates to a method and a system for removing vanadium from crude titanium tetrachloride by adopting a method for removing vanadium by organic matter. Background technique [0002] Crude titanium tetrachloride (TiCl 4 ) to remove vanadium is refined TiCl 4 an important process. Not only to remove impurity vanadium for decolorization, but also to remove oxygen. In crude TiCl 4 Among them, vanadium is mainly VOCl 3 form, its boiling point is 127.2°C, and TiCl 4 The boiling point of 136.4 ° C is close to that of TiCl 4 —VOCl 3 The difference in boiling point is 9.2°C, and their relative volatility is α=1.22. Therefore, it is difficult to separate by general physical distillation methods, and chemical methods are currently used to remove vanadium. Crude titanium tetrachloride refining technology mainly includes copper wire vanadium removal method, aluminu...

AI Technical Summary

Problems solved by technology

However, the refining of organic matter to remove vanadium will produce a large amount of residue, which is sticky and easy to scar the equipment pipes and container walls, especially easy to block the heat exchanger pipes, affect the heat transfer of the equipment, paralyze the key equipment, and seriously affect the system. anterograde and continuous run cycles

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