System and method for recovering titanium tetrachloride from titanium tetrachloride suspension liquid

Abstract

The invention discloses a system and method for recovering titanium tetrachloride from a titanium tetrachloride suspension liquid. The method is characterized in that after being subjected to vanadiumremoval through a vanadium removal reactor, the titanium tetrachloride is conveyed to a spiral plate heat exchanger through a suspension liquid pump, then the vanadium removal suspension liquid afterbeing cooled through the spiral plate heat exchanger enters a buffer tank, a tail gas discharge device is arranged at the top of the buffer tank, gaseous silicon tetrachloride in the buffer tank is discharged to a tail gas treatment system through the tail gas discharge device, the suspension liquid in the buffer tank is conveyed to a suspension liquid centrifuge through the suspension liquid pump, and solid-liquid separation can be quickly performed under the action of centrifugal force.

Description

technical field [0001] The invention belongs to the field of titanium tetrachloride recovery, and in particular relates to a system and a method for recovering titanium tetrachloride from a titanium tetrachloride suspension. Background technique [0002] Titanium tetrachloride is the most important raw material for the production of titanium sponge and titanium dioxide by chloride method. At present, industrial titanium tetrachloride in the world is mainly produced by the chlorination method. The raw materials used in the chlorination method contain certain impurities. When titanium dioxide is chlorinated, the impurity elements are also chlorinated to generate corresponding chlorides. These impurities directly It affects the quality of titanium sponge. Therefore, crude titanium tetrachloride must be purified before it can be used to produce titanium sponge and titanium dioxide. Because the vanadium impurity in crude titanium tetrachloride mainly exists in the form of trialu...

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Problems solved by technology

[0003] Titanium tetrachloride slurry recovery is more difficult than ordinary solid-liquid separation, which is mainly reflected in the fact that the whole process is required to be carried out in a closed state. Titanium tetrachloride is exposed to air and hydrolyzed to emit white smoke, which irritates the respiratory tract and endangers human health; titanium tetrachloride splashes On the skin or in the eyes, the hydrolysis will burn the skin and eyes, causing irreversible skin burns or vision loss or even blindness; and the viscosity is high, the development of recycling technology and equipment should properly solve the problems of airtightness and high viscosity

Although this method can reclaim titanium tetrachloride preferably, due to the temperature control of the chlorination furnace, it cannot be continuously added, so that it cannot be continuously recovered. At the same time, when adding the chlorination furnace, it should be added at a uniform and small flow rate to reclaim the amount of titanium tetrachloride. Limited, cannot handle large volumes of mud

[0006] The separation of sludge by screw discharge decanter centrifuge is a nonlinear process. The nonlinear change mainly comes from the separation characteristics of the centrifuge, the physical properties of the separated particles and the operation of the particle separation. Because the given control variables cannot achieve the same separation effect, it is difficult to optimize the separation process and improve the separation effect by using classical control.

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