Mechanisms and Process Model of Ultra-Refining of Metals by Crystallization via a rotating cooled cylinder

旋转冷却筒结晶超精炼金属的机理和过程模型

• 批准号: 421743304
• 负责人: Dr. Markus Apel
• 金额: --
• 依托单位: Access e.V.
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/421743304?language=en
• 关键词: Mechanisms; Process; Model; Ultra; Refining

The project aims to explore an alternative method for the synthesis of pure metals. The core element is fractional crystallization, which is to be conducted through an internally cooled rotating crystallizer (in short named "cooled finger"), on which the ultra-pure metal from a contaminated melt grows. This method has in the case of success the potential to replace the current zone melting process. However, the understanding of an effective application of this method, particularly the process controlling parameters as well as a description of the mechanisms in the process, is currently lacking. By interplay of thermophysical computations and solidification simulation on a macroscopic process and microscopic microstructure scale, the demixing processes at the progressive phase boundary are to be quantitatively described and correlated with process parameters. Extensive DoE-supported experimental investigations to verify and validate numerical predictions are performed on aluminum. Aluminum has been chosen here as the model metal due to the existance of the required thermodynamic and physical data for the simulation that allowing a quantitative study of the fundamental principles and dominant process parameters for the cold finger method. Aluminum is cost-effective in various purities, which means a significant reduction in research costs. The project results are aimed at process windows for efficient cleaning and the associated parameters and process models for controlling the solidification front dynamics. The cooperation of three working groups with different research interests aims to provide a quantitative understanding of the potential of this - so far - unexplored crystallization process. The physically-based simulation model will facilitate simplified transfer to other alloying systems.

该项目旨在探索一种合成纯金属的替代方法。核心元素是分式结晶，这是通过内部冷却的旋转结晶器（简称“冷却手指”）进行的，来自污染熔体的超纯金属在上面生长。在成功的情况下，这种方法有可能取代目前的区域熔化工艺。然而，对这种方法的有效应用的理解，特别是过程控制参数以及过程中机制的描述，目前还缺乏。通过热物理计算和凝固模拟在宏观过程和微观组织尺度上的相互作用，定量描述了进阶相边界上的脱混过程，并将其与工艺参数相关联。广泛的doe支持实验调查，以验证和验证铝的数值预测。这里选择铝作为模型金属，是因为存在模拟所需的热力学和物理数据，可以对冷指法的基本原理和主要工艺参数进行定量研究。铝的各种纯度都具有成本效益，这意味着研究成本的显著降低。该项目的结果是针对有效清洗的工艺窗口和控制凝固前沿动力学的相关参数和过程模型。具有不同研究兴趣的三个工作组的合作旨在对这种迄今为止尚未开发的结晶过程的潜力提供定量理解。基于物理的仿真模型将有助于简化到其他合金系统的转移。