Composite chlorination furnace for titanium tetrachloride production

Abstract

The invention discloses a composite chlorination furnace for titanium tetrachloride production, and relates to the technical field of chlorination furnaces. The composite chlorination furnace for titanium tetrachloride production comprises a boiling chlorination section and a fused salt chlorination section, a gas distributor is fixed between the boiling chlorination section and the fused salt chlorination section; a first mixture inlet and a discharge port are formed in the side wall of the boiling chlorination section, and the discharge port is communicated with the fused salt chlorination section; the fused salt chlorination section is provided with a first chlorine inlet and a second mixture inlet, the middle part of the fused salt chlorination section is provided with a fused salt discharge port, the lower part of the fused salt chlorination section is fixedly provided with an electrode, the lower part of the fused salt chlorination section is provided with a second chlorine inlet, and the bottom of the fused salt chlorination section is provided with a fused salt discharge port. According to the furnace, metal chlorides generated in the boiling section are discharged into the fused salt chlorination section through side slag discharge and are regularly discharged, and the titanium recovery rate is greatly improved through furnace charge bottom discharge of the boiling section, furnace charge recovery of the fused salt section and recovery of TiO2 entrained by oxidation return chlorine.

Description

technical field [0001] The invention relates to the technical field of chlorination furnaces, in particular to a composite chlorination furnace for producing titanium tetrachloride. Background technique [0002] Titanium dioxide is a white inorganic pigment. It is the white pigment with the best performance in the world. It is an inorganic chemical product second only to synthetic ammonia and phosphoric acid. Its sales rank third in the world. It is widely used in coatings, plastics, papermaking and inks industry. Titanium dioxide is the most important type of titanium products. More than 90% of titanium ore in the world is used to produce titanium dioxide. The industrial production of titanium dioxide includes chlorination and sulfuric acid methods. The chlorination method of titanium dioxide has good quality and excellent performance. It is stable and basically does not cause pollution to the environment. It is the mainstream technology for international titanium dioxide ...

AI Technical Summary

Problems solved by technology

[0003] One of the key processes of chloride titanium dioxide is TiCl 4 The production of TiCl is currently produced industrially 4 There are mainly two processes of boiling chlorination and molten salt chlorination, but there are certain technical difficulties that are difficult to break through. The main manifestations are: on the one hand, during the process of boiling chlorination, as the reaction proceeds and the materials collide and rub against each other, the The particle size of the material gradually becomes smaller, and the recovery rate of titanium decreases as the tail gas is taken out; on the other hand, due to the limitation of reaction parameters and materials, boiling chlorination is not suitable for most domestic titanium resources (mainly high-calcium-magnesium titanium resources), so that resource advantages cannot be reflected

Molten salt chlorination is limited by its structural form, so the production capacity cannot be greatly increased; at the same time, it is difficult to recover the salt volatilized at high temperature, which also has an adverse effect on the subsequent process; third, compared with boiling chlorination, molten salt chlorination is more difficult to operate

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