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首页> 外文会议>World Conference on Titanium v.1; 20030713-20030718; Hamburg; DE >OS Process - Thermo-Electro-Chemical Reduction of TiO_2 in the Molten CaCl_2
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OS Process - Thermo-Electro-Chemical Reduction of TiO_2 in the Molten CaCl_2

机译：OS过程-熔融CaCl_2中TiO_2的热电化学还原

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摘要

A new reduction process is presented where TiO_2 is used as the raw material for reduction. It consists of the calcium reduction in the molten CaCl_2 bath and the electrochemical reaction for recovery of Ca from CaO in the same bath. TiO_2 powder injected near the cathode reacts with a few mol%Ca dissolved in the melt. The by-product CaO of calciothermic reduction dissolves into the molten CaCl_2, and it is electrochemically decomposed into Ca and CO/CO_2 gas by giving the voltage higher than that of theoretical decomposition for pure CaO. Some experimental results confirmed this process proposal, and the sufficiently deoxidized titanium metal was obtained at the bottom of the cell, when the basket type cathode was applied. Because the molten CaCl_2 has a large solubility for CaO, both mechanisms of the halide flux deoxidation and the electrochemical deoxidation worked efficiently to remove oxygen in Ti, once the metallic Ti particles were precipitated. This mechanism based on the calciothermic reduction and the electrolysis of CaO was experimentally approved in comparison with FFC process.
机译：提出了一种新的还原工艺，其中以TiO_2为还原原料。它由熔融CaCl_2浴中的钙还原和在同一浴中从CaO中回收Ca的电化学反应组成。在阴极附近注入的TiO_2粉末与溶解在熔体中的少量mol％Ca反应。降热还原的副产物CaO溶解在熔融的CaCl_2中，并且通过提供比纯CaO的理论分解电压高的电压，将其电化学分解为Ca和CO / CO_2气体。一些实验结果证实了该工艺方案，当使用篮式阴极时，在电池底部可获得充分脱氧的钛金属。由于熔融的CaCl_2对CaO的溶解度高，一旦金属Ti颗粒析出，卤化物通量脱氧和电化学脱氧的两种机理都能有效地除去Ti中的氧。与FFC工艺相比，基于钙热还原和CaO电解的机理得到了实验验证。

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