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.

该研究涉及一种新型的精炼金属方法。 它将利用Yttria稳定锆石（YSZ）固体电解质的氧离子传导性能从熔融金属和矿渣中迅速去除氧气。 通常，YSZ电解液的一侧将与熔体和另一侧接触，而不会使气体不让气体和熔体直接接触。 这种排列类似于氧气浓度电池，因此可以通过电流通过电解质来清除氧气。 可以通过外部连接（短电路）在电解质两侧的外部连接（短电路）来实现这一点。 在此（短路）条件下的氧气可以足够高，可以快速脱氧（优化）熔体。 为了通过此技术有效去除氧气，YSZ电解质必须很薄，并且电极必须是多孔的，并且必须覆盖整个电解质表面以进行电荷转移。 如上所述，将构建和使用这种新颖的精炼装置，以研究从铜，低碳铁和氧化二氧化硅熔体中去除氧气的动力学。 基于研究，主要研究者将确定这些系统中去除氧气的速率控制步骤，并确定有效炼油条件。 这种用于精炼金属的新过程在环境上是合理的，可以使用含氢和碳，这些氢和碳含有减少气体，而不会冒熔化熔体和碳含量的风险，并且也很快。