Method for removing vanadium from titanium tetrachloride

Abstract

The invention discloses a method for removing vanadium from titanium tetrachloride. The method comprises the following steps: AlCl3 mixed liquor is prepared in an AlCl3 preparation tank and used as the initial catalyst of the vanadium-removing reaction; crude titanitim tetrachloride is heated by a start-up preheater in the start-up initial stage and then enters a vanadium-removing reactor, after the reactor starts normally, crude titanitim tetrachloride directly passes through an overhead condenser matched with a rectifier for heat exchange; and the obtained titanitim tetrachloride without vanadium contains solid vanadium slag impurity and continuously enters a metal membrane filter for filtration, the filtered titanitim tetrachloride clear solution enters an evaporative heat exchanger to be heated to gas state, the obtained gas enters an evaporator to perform flash evaporation and then enters a rectifier in the form of steam, AlCl3 impurity in titanitim tetrachloride is removed through rectification process, and the refined titanitim tetrachloride is collected from the top of the tower. The heat source is utilized reasonably in the production process, thus greatly reducing the production cost.

Description

technical field [0001] The invention relates to a method for removing vanadium from titanium tetrachloride, in particular to a method for removing vanadium from titanium tetrachloride using steam as a heat source. Background technique [0002] Refined TiCl 4 It is the main raw material for the production of titanium sponge and the production of titanium dioxide by gas phase oxidation. Refined TiCl 4 The quality will directly affect the quality of products such as titanium sponge and titanium dioxide. About 4t of TiCl is needed to produce 1t of sponge titanium by magnesia thermal reduction method 4 , from raw material TiCl 4 Almost all the impurities brought into the reduction system are enriched in the product titanium sponge. Therefore, the impurity content in sponge titanium will be higher than that of raw material TiCl 4 The impurity concentration in is about 4 times higher. Therefore, in order to obtain qualified sponge titanium products, it is necessary to prepare...

AI Technical Summary

Problems solved by technology

[0004] Up to now, in the sponge titanium and titanium dioxide industries, the aluminum powder vanadium removal and refining titanium tetrachloride process equipment generally adopts electric heating, and the aluminum powder vanadium removal system formed by electric heating has the following disadvantages: the material temperature in the electric heating still It is not easy to control, and bumping phenomenon often occurs, which affects normal production and even causes process accidents; electric heaters are expensive and have a short lifespan. Usually, the service life is about 1 year, and the power consumption is high, and the production cost is high, so it is not suitable for long-term use. ; Using electric heating, due to the limitations of the volume of the still, the still is not suitable for configuring a larger power electric heating device, resulting in a small production scale for the removal of vanadium from titanium tetrachloride in a single system

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