Method for removing VOCl3 and VCl4 from rough titanium tetrachloride

Abstract

The invention discloses a method for removing VOCl3 and VCl4 from rough titanium tetrachloride. The method comprises the following steps: (a) adding iron powder into rough titanium tetrachloride, anduniformly stirring; (b) heating a uniform mixed solution of rough titanium tetrachloride and the iron powder, so as to generate a deposited solid mixture and evaporative gas; and (c) cooling and collecting evaporative gas, and filtering and separating the deposited solid mixture from liquid. By taking the iron powder as the raw material, the production cost can be greatly lowered; a byproduct FeCl2 obtained in a vanadium removal process is a solid phase, has a relatively high boiling point and is unlikely to enter a refined titanium tetrachloride product; carbon is not introduced in the production process, so that the content of organic impurities in the product can be effectively reduced, meanwhile, the problems that the wall of a reactor is adhered by organic matters in the vanadium removal process and the like can be avoided, and the production continuity is good; low valence titanium preparation equipment does not need to be additionally arranged, so that the equipment input is low; and HCl is not generated in the production process, so that the corrosivity caused to equipment is low, and the production safety is high.

Description

technical field [0001] The invention relates to the field of titanium chemical industry, in particular to a method for removing VOCl in crude titanium tetrachloride 3 and VCl 4 Methods. Background technique [0002] Titanium tetrachloride is the main intermediate raw material in the titanium industry chain, and is the raw material for the production of titanium sponge and titanium dioxide by chloride method. At present, the method of producing titanium tetrachloride in the industry is the carbochlorination method using titanium-rich raw materials as raw materials. The main processes include molten salt chlorination process and boiling chlorination process. The obtained titanium tetrachloride contains certain impurities. , especially vanadium oxychlorides (mostly as VOCl 3 exists in the form of VCl 4 Exist in the form of), impurities have a greater impact on the quality of titanium sponge and chloride titanium dioxide, and need to be removed before entering the downstream...

AI Technical Summary

Problems solved by technology

[0003] At present, the widely used vanadium removal methods in industry include copper wire vanadium removal method, aluminum powder vanadium removal method, hydrogen sulfide vanadium removal method and organic matter removal vanadium method. The product quality of the vanadium method is good, but the efficiency is low, the cost is high, and the environmental protection pressure is high; the cost of the organic matter removal vanadium method is low, the output is large, but the operation stability is poor, and the product quality is not high; the production efficiency of the hydrogen sulfide removal method is high, and the cost is high. Low, but the by-product HCl generated in the production process will corrode the equipment, and the quality of the product is not high; the product quality of the aluminum powder vanadium removal method is good, vanadium can be recovered, and the cost is moderate, but the production process is too long and needs to be designed separately at a low price Titanium preparation equipment