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将TiO2粉末烧结成阴极片后直接在CaCl2融盐中进行电化学还原制取钛的工艺是目前的研究热点。在粉末成型过程中用碳粉代替粘接剂,研究了成形压力、碳粉用量及水的用量对成型后阴极片孔隙率的影响;在3.1V电压下,950℃的CaCl2融盐中进行电化学还原实验,借助SEM,EDS及XRD分析了电解产物的形貌、成分及物相;分析了阴极孔隙对电解过程的影响。结果表明:加入碳粉,减小成形压力可以增大TiO2阴极的孔隙率,水的用量对阴极孔隙率影响不大;添加碳粉的TiO2阴极可以还原成海绵钛。
It is the current research hotspot that titanium dioxide is prepared by sintering TiO2 powder into cathode and directly electrochemically reducing CaCl2 into salt. The effect of forming pressure, the amount of carbon powder and the amount of water on the porosity of the cathode sheet after forming was investigated in the powder molding process with the carbon powder instead of the binder. The chemical reduction experiments were carried out. The morphology, composition and phase of the electrolysis products were analyzed by SEM, EDS and XRD. The influence of cathode porosity on the electrolysis process was analyzed. The results show that the addition of carbon powder can reduce the forming pressure and increase the porosity of TiO2 cathode. The amount of water has little effect on the cathode porosity. The TiO2 cathode with carbon powder can be reduced to titanium sponge.