Electrochemical Reduction Behavior of Soluble CaTiO₃in Na₃AlF₆-AlF₃Melt for the Preparation of Metal Titanium

Abstract

Direct preparation of metal titanium from soluble CaTiO3 in the Na3AlF6-AlF3 melt by electrolysis was confirmed, providing a short route for the high value utilization of CaTiO3 concentrates obtained from the titanium bearing blast furnace slag. The solubility of CaTiO3 in the Na3AlF6-AlF3 melt at 1253 K was determined by the isothermal saturation method and the electrochemical reduction behavior of TiO32− was investigated by cyclic voltammogram, square wave voltammogram, open circuit potential and potentiostatic electrolysis. The results indicated that the solubility of CaTiO3 in the melt was 2.4% at 1253 K. The TiO32− ions were reduced to metal titanium by the consecutive three-step reduction reactions: TiO32 − → TiO → Ti2O → Ti. The diffusion coefficient of TiO32− in the Na3AlF6-AlF3 melt was 6.7 × 10−6 cm2s−1 at 1253 K. The deposited metal titanium was successfully separated with Na3AlF6 by evaporation at 1823 K.

Enhanced electrodeposition and separation of metallic Cr from soluble K2CrO4 on a liquid Zn cathode

“…The relationship between peak current and scan rate can be expressed as Eq. (2) : [22] i p = 0 . 4958…”

“…Structure optimization of graphite anode is also an effective way to mitigate the carbon contamination in cathode product [7] . However, carbon content in refractory metals is still too high, especially for metals electrodeposited from oxygenrich metal oxysalts (such as K 2 CrO 4 [20] , NaVO 3 [21] and CaTiO 3 [22] ).…”

“…In our recent works, a new method, named soluble oxysalts electrolysis (SOSE), was proposed to produce metals in a short process [7,[20][21][22]27] . Metallic Ti, V and Cr were obtained by the direct electrolysis of soluble CaTiO 3 , NaVO 3 and K 2 CrO 4 , respectively.…”

The Electrochemical Reduction Mechanism of ZnFe2O4 in NaCl-CaCl2 Melts

“…The schematic diagram of the electrode and the electrolysis device are shown in Figure 2. The theoretical decomposition voltage E Θ of ZnFe 2 O 4 was calculated by Formula (1) [11].…”

Electrochemical Conversions of Soluble Borates to CaB6with Superior Optical Property in NaCl-CaCl2Melt

“…Ti, V and Cr were obtained by the direct electrolysis of soluble CaTiO 3 , NaVO 3 and K 2 CrO 4 , respectively. [22][23][24] In fact, NaBO 2 or Na 2 B 4 O 7 as oxysalts was usually soluble in molten salts, 25,26 which provided better dynamic conditions than that of insoluble CaB 2 O 4 pellets during electrolysis. In addition, the sintering process to prepare CaB 2 O 4 pellets can be avoided.…”