FUNDAMENTAL RESEARCH OF ELECTROLYTIC PRODUCTION OF HIGH-PURITY IRON.

电解生产高纯铁的基础研究。

• 批准号: 03650540
• 负责人: FUKUSHIMA Hisaaki
• 金额: $ 1.41万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650540/
• 关键词: Electrorefining; High-Purity Iron; Impurity Codeposition; Inclusion Mechanism

First,the compositions of the sulfate and chloride baths used in this research were determined from the information in the literature on the production of electrolytic Fe. On the basis of the thermodynamic properties of the impurities which might be found to include in the electrolytic Fe,the thirty kinds of impurities were classified into the four groups as follows;(1)elements which are more noble than Fe and can be electrocodeposited with Fe,(2)elements which are less noble than Fe and can be electrocodeposited from aqueous solutions,(3)elements which cannot be electrodeposited from aqueous solutions and (4) Gaseous elements.Based on this classification,the mechanism of impurity inclusion into electrolytic Fe was estimated.Then,the electrodeposition of Fe from the baths containing the impurities which were capable of being electrodeposited from aqueous solutions was carried out to clarify the inclusion mechanism of the impurities.As for Cu and Cd,the normal codeposition behavior was observed and the content of these elements did not lowered below the metal-percentage of these impurity ions in bath.Ni and Co,which were more noble than Fe,showed anomalous codeposition behavior in sulfate solutions in which the contents of Ni and Co of the deposited Fe were lower than the impurity level in baths.On the other hand,the impurity contents of Fe deposited from chloride solutions was higher than that from sulfate solutions because of the suppression of this anomaly.Further,it was found that the content of Pb,Sn and Mo contents of the deposit were lower than the impurity level in the baths due to their chemical and electrochemical properties of these elements.On the other hand,not only the considerable polarization during the electroreduction of more noble Fe but also the underpotential deposition of Zn caused the significant codeposition of Zn with Fe and electrolytic inclusion of Zn must be taken into consideration.

首先，本研究中使用的硫酸盐和氯化物浴的成分是根据电解铁生产文献中的信息确定的。根据电解铁中可能含有的杂质的热力学性质，将这30种杂质分为4类：(1)比铁贵重且可与铁电共沉积的元素；(2)比铁贵重但可从水溶液中电共沉积的元素；(3)不能从水溶液中电沉积的元素；(4)气态元素。在此基础上，分析了电解铁中杂质夹杂的机理。然后，在含有杂质的水溶液中进行电沉积，以澄清杂质的包合机制。Cu和Cd的共沉积行为正常，其含量不低于这些杂质离子的金属含量。镍和Co在硫酸盐溶液中表现出异常的共沉积行为，其中沉积的铁中镍和Co的含量低于浴液中的杂质含量。另一方面，由于这种异常的抑制，氯化物溶液中沉积的铁的杂质含量高于硫酸盐溶液。此外，由于Pb、Sn和Mo元素的化学和电化学性质，沉积物中的Pb、Sn和Mo的含量低于槽中的杂质含量。另一方面，必须考虑高铁电还原过程中相当大的极化，以及锌的欠电位沉积导致锌与铁的显著共沉积和锌的电解包合。