Method for producing titanium tetrachloride by molten salt chlorination and adding industrial salt

Abstract

A method for adding an industrial salt for producing titanium tetrachloride through a molten-salt chlorination process is closed and comprises: arranging a mixed-material bin on the sidewall of a chlorination furnace, arranging a salt adding bin at the top of the mixed-material bin, arranging a rigid impeller feeder at the bottom of the salt adding bin, and adjusting revolution of an impeller motor through a frequency converter and controlling the feeding speed; and putting the industrial salt in the salt adding bin, controlling revolution of the impeller feeder by changing the frequency, conveying the industrial salt to the mixed-material bin before entering the chlorination furnace, and enters into the chlorination furnace together with a mixed material through a feeding spiral conveyer. The beneficial effects comprise that air is prevented from entering into the chlorination furnace, the purpose of uniformly adding the salt by adjusting the rotation speed of the rigid impeller feeder, and the molten-salt system stability is guaranteed; the salt adding technology completely realizes the enclosed continuous requirements, the usage granularity requirement of the industrial salt is reduced, thus the industrial salt with fine granularity and low water content can be purchased and used, and therefore the chlorination furnace production requirement is satisfied and also the drying operation for large-granularity seal salt is saved.

Description

technical field [0001] The invention relates to the technical field of producing titanium dioxide by molten salt chlorination, in particular to a method for producing titanium tetrachloride by molten salt chlorination and adding industrial salt. Background technique [0002] Molten salt chlorination, as one of the two major processes for preparing titanium tetrachloride from high titanium slag, has high adaptability to raw material high titanium slag, because molten salt has many superior properties, such as stability at high temperature, Low vapor pressure, low viscosity, good conductivity, high ion migration and diffusion speed, high heat capacity, ability to dissolve different materials, etc. The molten salt chlorination raw material high titanium slag contains CaO, MgO, MnO, Al 2 o 3 , SiO 2 and other impurities, as the chlorination reaction proceeds, calcium, magnesium, manganese chloride and Al 2 o 3 , SiO 2 etc. will continue to accumulate in the molten salt med...

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Problems solved by technology

[0003] In order to overcome the above-mentioned deficiencies in the prior art, the present invention provides a method for producing titanium tetrachloride by molten salt chlorination and adding industrial salt. Hydrolysis of titanium chloride reduces the recovery rate of titanium tetrachloride, and minimizes the probability of industrial salt being blown out of the furnace with furnace gas, improves the use efficiency of industrial salt and reduces production costs

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