Jingsai Cao, Xinyue Cai, Jijun Wu, Kuixian Wei, Wenhui Ma
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引用次数: 0
摘要
从废硅接触块(SSCM)中回收硅和铜对环境保护和资源稀缺具有重要意义。本研究介绍了一种结合低温贫氧焙烧和选择性浸出的新策略,该策略能高效地从废硅接触块中回收硅和铜,并制成硅-铜粉末。回收的 Si-Cu 粉可用作 Si-Cu 复合材料的优质原料,并有望继续用作单体生产原料。在低温缺氧焙烧过程中,外表面形成了一层保护性的 Si 氧化层,防止了 Si 粉末的不良氧化,并有效地去除了 SSCM 中的 C。在混合 HCl-HF 酸的选择性浸出过程中,利用了 Cu 与其他金属元素之间的化学稳定性差异,从而有针对性地去除杂质。通过 E-pH 图分析了杂质浸出的热力学,并利用均相模型阐明了杂质浸出的动力学行为。这一创新策略首次将除碳与金属杂质的选择性浸出相结合,实现了 SSCM 的高效和功能性利用。这项研究为 SSCM 的处理提供了一种新的有效方法。
A Novel Strategy for the Simultaneous Recovery of Silicon and Copper from Spent Silicon Contact Mass
The recovery of silicon and copper from spent silicon contact mass (SSCM) holds significant importance for environmental protection and resource scarcity. This study introduced a novel strategy that combines low-temperature and oxygen-poor roasting, and selective leaching, exhibiting high efficiency in recovering Si and Cu in the form of Si–Cu powder from SSCM. The recovered Si–Cu powder can be used as high-quality raw materials for Si–Cu composite materials, and is expected to continue to be used as monomer production raw materials. A protective Si oxide layer on the outer surface, formed during the low-temperature and oxygen-poor roasting process, preventing the undesirable oxidation of Si powder, and the C in the SSCM was effectively removed. The chemical stability difference between Cu and other metallic elements was exploited during selective leaching with mixed HCl–HF acid, resulting in the targeted removal of impurities. The thermodynamics of impurity leaching was analyzed by E-pH diagram, and the kinetic behavior of impurity leaching was described elucidated using homogeneous model. This innovative strategy marks the first instance of combining C removal with selective leaching of metallic impurities, achieving efficient and functional utilization of SSCM. This study offered a new and effective approach to SSCM treatment.
期刊介绍:
The journal Silicon is intended to serve all those involved in studying the role of silicon as an enabling element in materials science. There are no restrictions on disciplinary boundaries provided the focus is on silicon-based materials or adds significantly to the understanding of such materials. Accordingly, such contributions are welcome in the areas of inorganic and organic chemistry, physics, biology, engineering, nanoscience, environmental science, electronics and optoelectronics, and modeling and theory. Relevant silicon-based materials include, but are not limited to, semiconductors, polymers, composites, ceramics, glasses, coatings, resins, composites, small molecules, and thin films.