Method for preparing metallic titanium by electrolyzing TiCl4 molten salt and electrolysis bath thereof

Abstract

A method for preparing metallic titanium by TiCl4 fused salt electrolysis and an electrolysis bath for preparing the metallic titanium are disclosed, wherein the method comprises the following steps: pre-warming, adding electrolyte, pumping shielding gas, hollow electrolyzing, electrolyzing by adding TiCl4, electrolyzing, hollow electrolyzing, pumping shielding gas, discharging and after-treatment technology steps, wherein the anode of the electrolysis bath is graphite inside lining, the cathode is a steel bar, a baffle plate is arranged between the graphite anode and the steel bar cathode, and the baffle plate is submerged in molten electrolyte, a cylinder type airtight container with a cover is arranged on the baffle board, the steel bar cathode is arranged on the cover, electrolyte and TiCl4 feed inlet are further arranged on the cover, the electrolyte and a feed inlet are further mounted on the cover, a stainless steel discharging tube and a bleeding and pressure gauging pipe orifice are arranged on the bottom of the electrolysis bath, an argon gas inflating orifice is arranged on the side-wall of the cylinder container, an anode gas chamber is arranged between the upper portion of sides of the bath and the upper portion of the baffle plate, a Cl2 exhaust port is arranged on the chamber, a slope is arranged on the lower portion of the cathode chamber where the cathode chamber is arranged near to the baffle plate, space of the bottom of the graphite anode and the baffle plate is stamped by fireproof concrete. Compared with the traditional TiCl4 low-temperature fused salt electrolysis technology, the method has the advantages of solving the problems of high oxygen content in titanium powder in the electrolyzing products, can not proceed continuous production, great variation of the heat balance and the material balance of the electrolysis bath, and low efficiency of the electric current.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal metallurgy, in particular to a TiCl 4 The invention discloses an electrolytic method and an electrolytic cell for producing powdered titanium metal by electrolysis of molten salt. Background technique [0002] At present, the industrial titanium at home and abroad is mainly produced by the Kroll method. The titanium produced by this method is sponge-like, called sponge titanium. The main process is: use rutile or High-grade materials obtained after the treatment of ilmenite and other concentrates - artificial rutile and high-titanium slag (containing TiO 2 85%-90% or more) as raw material, after high temperature chlorination, crude TiCl is obtained 4 , and then purified by rectification to obtain pure TiCl 4 Afterwards, in a vacuum reduction furnace, TiCl was reduced with metal magnesium 4 , the reduction product is sponge metal titanium, molten MgCl 2 and unreacted metal Mg. After ...

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Problems solved by technology

It should be said that in the production of several major non-ferrous metals, the productivity of sponge titanium produced by the Kroll method is the lowest

[0004] 2. The reduction reaction is carried out at high temperature, and both the reactant and the product are chlorides, which will cause serious corrosion to the furnace body and equipment

Long-term operation of the reduction furnace under high temperature and vacuum conditions will cause deformation and cause consumption

[0005] 3. High energy consumption

It can be seen from this that in the existing process, the unit energy consumption of producing sponge titanium is the highest

[0006] 4. Continuous production cannot be realized

[0011] (1) Among the loose titanium powder particles in the cathode electrolytic cell basket, the chloride of low-valent titanium cannot be completely electrolyzed. When the electrolysis ends, the loose and porous electrolyte melt containing chloride of low-valent titanium will Together with the loose titanium in the basket, it is taken out of the electrolytic cell. During the subsequent washing process, the chloride of low-valent titanium and water are hydrolyzed to form TiO 2 and TiO, resulting in an increase in the oxygen content in the electrolysis product titanium powder

[0012] (2) Cannot be produced continuously

[0013] (3) The heat balance and material balance of the electrolyzer change greatly

[0014] (4) Low current efficiency

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