A New Concept for Refining Molten Metals and Recovering Metals from Slags

精炼熔融金属和从炉渣中回收金属的新概念

• 批准号: 9113480
• 负责人: Uday Pal
• 金额: $ 28.36万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-11-01 至 1995-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9113480&HistoricalAwards=false
• 关键词: New; Concept; Refining; Molten; Metals

The research involves a novel approach for refining metals. It will utilize the oxygen ion conducting properties of yttria stabilized zirconia (YSZ) solid electrolyte to rapidly remove oxygen from molten metals and slags. Typically, one side of the YSZ electrolyte will be in contact with the melt and the other side with a reducing gas without letting the gas and the melt come in direct contact with each other. This arrangement resembles an oxygen concentration cell, and therefore oxygen may be removed by passing an electric current through the electrolyte. This can be accomplished without the application of external potential by externally connecting (short circuiting) the electrodes on two sides of the electrolyte. The oxygen flux under this (short circuit) condition can be sufficiently high to rapidly deoxidize (refine) the melt. In order to efficiently remove oxygen by this technique, the YSZ electrolyte must be thin, and the electrodes must be porous and should cover the entire electrolyte surface for charge transfer. This novel refining device will be constructed and used as described above to study the kinetics of oxygen removal from copper, low carbon iron and lead oxide-silica melts. Based on the study the principal investigator will determine the rate- controlling step for oxygen removal in these systems and establish conditions for efficient refining. This new process for refining metals is environmentally sound, can use hydrogen and carbon containing reducing gases without running the risk of increasing hydrogen and carbon content of the melt, and is also rapid.

这项研究涉及一种精炼金属的新方法。 它将利用氧化钇的氧离子传导特性 稳定的氧化锆（YSZ）固体电解质， 来自熔融金属和炉渣的氧气。 通常， YSZ电解质将与熔体和另一侧接触 用还原性气体，不让气体和熔体进入， 彼此直接接触。 这种安排类似于一个 氧浓差电池，因此可以通过 使电流通过电解质。 这可以 在不施加外部电势的情况下， 外部连接（短路）两个电极 电解质的侧面。 在此条件下的氧通量（短 电路）条件可以足够高以快速脱氧 （精炼）熔体。 为了有效地去除氧气， 技术，YSZ电解质必须薄，电极 必须是多孔的，并且应该覆盖整个电解质表面， 电荷转移 这种新型的精炼装置将被建造和使用， 如上所述，以研究氧气从 铜、低碳铁和氧化铅-二氧化硅熔体。 基于 研究的主要研究者将确定比率- 控制这些系统中的除氧步骤， 有效精炼的条件。 这种新的提炼方法 金属是环保的，可以使用氢和碳， 含有还原性气体，而不会增加 氢和碳含量的熔体，也是迅速的。