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    Home > Coatings News > Paints and Coatings Market > University of Science and Technology Beijing has developed a soluble anode electrolytic titanium extraction method

    University of Science and Technology Beijing has developed a soluble anode electrolytic titanium extraction method

    • Last Update: 2021-11-09
    • Source: Internet
    • Author: User
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    Global Coatings Network News:  


    Global Coatings Network News:  


    Titanium is one of the most abundant elements in the earth's crust.
    However, since titanium was discovered more than 200 years ago, it has been listed as a rare metal due to difficulties in extraction.
    From the second half of the 20th century, with the development of the aviation industry, titanium smelting has only received people's attention.
    Titanium is a high melting point metal with low density.
    The strength of titanium alloy is comparable to that of high-strength steel.
    At the same time, it has good corrosion resistance.
    These advantages of titanium alloy make it deservedly called "space metal" It also has the reputation of "Marine Metal".
    However, so far, the global production of titanium metal is less than 1% of the production of primary aluminum, and less than 1/10 of the production of titanium dioxide.
    The main reason for this phenomenon lies in the defects of the current production methods of titanium metal.



    At present, titanium metal at home and abroad is mainly produced by the thermal reduction of TiCl4 with magnesium, which is called the Kroll method.
    The basic process is: the stainless steel reactor containing metallic magnesium is heated to 950°C, and refined TiCl4 is injected, which reacts and exotherms.
    After the reaction, the by-product MgCl2 and the remaining magnesium are vacuumed out and recycled.
    After the reactor was cooled, the reactor was opened to obtain sponge titanium.
    The Kroll method has been criticized since the beginning because of its high cost and low reduction efficiency.
    The main reasons for the high production cost of this method are: (1) Time-consuming, the whole process from the chlorination of TiO2 to the production of sponge titanium takes 17 days; (2) Energy-consuming, endothermic chemical reduction and exothermic chemical reduction They were completed in different reactors, and the potential was not utilized.
    The energy consumption of producing 1 ton of titanium was 6945kW·h; (3) Labor intensity: the reaction needs to be carried out under vacuum and protective atmosphere, and the process is discontinuous and intermittent.
    Operation; (4) The raw materials are expensive: Mg and TiCl4 account for about 71% of the cost; (5) The environmental load: TiCl4 and Cl2 are highly corrosive, the production process needs to be carried out in a closed system, no leakage is allowed, and therefore The equipment investment is relatively large.
    Half a century has passed, and the process has not undergone a fundamental change.
    It is still intermittent production and has not been able to achieve continuous production, so the production cost is very high.


    In view of the above reasons.
    Now the whole world is working hard to develop new titanium metallurgy technology.


    Recently, the University of Science and Technology Beijing has developed a soluble anode electrolytic titanium extraction method, which is called the USTB process.
    Because titanium oxycarbide has conductivity within a certain range of composition, it can be used for anode electrolytic dissolution, and at the same time, metallic titanium can be obtained on the cathode.
    The USTB process uses titanium-containing soluble anode material as the titanium source, and electrolysis produces high-purity titanium.
    The specific process is divided into two parts: carbothermal reduction and molten salt electrolysis.
    In the process, the soluble anode TiCxOy is prepared by using TiO2 and graphite as raw materials, mixed and pressed with a certain stoichiometric ratio, and the bulk raw materials obtained by pressing are sintered at a certain heat treatment temperature to obtain the soluble anode material TiCxOy.
    The prepared bulk material is connected to form an anode, and electrolysis is performed in molten salt.
    Global Coatings Network learned that during the electrolytic preparation of metal titanium, anode raw materials and cathode metal products are distributed in different sections of the electrolytic cell.
    During anode reaction, titanium ions dissolve into molten salt, and then migrate to the vicinity of the cathode under the action of electricity The interface is deposited to obtain metallic titanium.
    The analysis results show that the electrolytic product titanium has an oxygen content of less than 300×10-6 and a carbon content of less than 700×10-6, and the cathode current efficiency can reach 89%.
    The USTB process produces TiCxOy solid solution through carbothermic reduction, thereby solving the cumbersome production of TiC and TiO separately, and at the same time controlling the composition of TiCxOy solid solution to ensure continuous electrolysis.
    At present, this method has entered the mid-term test stage.

    (Source: Global Coatings Network) (For more information, please log in: Global Coatings Network http:// )
     


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