An alternative approach to reclaim spent nickel–metal hydride batteries

Yi Ming Kuo, Kuo Lin Huang, Jian Wen Wang, Cheng Hsien Tsai, Sheng Lun Lin

研究成果: Article同行評審

4 引文 斯高帕斯(Scopus)

摘要

Spent nickel-metal hydride (NiMH) batteries contained some valuable metals which are worthy of recovery. This study focuses on the reclamation of spent NiMH batteries using an alternative approach, thermal separation process (TSP). Spent NiMH batteries were mixed with cullet, limestone, and dolomite. The mixture was heated to 1,450°C and cooled to room temperature without forced convection. During the TSP, the output-materials were divided into slag, ingot, and flue gas according to the boiling points and densities of metals. Results show that metals having a relatively low boiling points, such as Cd, Hg, Pb, and Zn, were mostly vaporized into flue gas. Among the metals retained in molten materials, Co, Cu, Fe, and Ni predominately went into the bottom layer and formed the ingot; on the contrary, Al, Ca, Mg, and Si stayed in the upper layer and formed slag. Therefore, the main components of slag were Si (316,000 mg/kg), Ca (289,000 mg/kg), and Mg (32,400 mg/kg) and the major crystalline phases were CaSiO3, CaMgSi2O6, and Ca2MgSi2O7. The slag was pended as non-hazardous materials and could be reused as road pavement or building materials. The ingot had high levels of Ni (408,000 mg/kg), Fe (349,000 mg/kg), and Co (55,400 mg/kg) and could act as an additive in stainless steel manufacturing process.

原文English
文章編號e13433
期刊Environmental Progress and Sustainable Energy
39
發行號6
DOIs
出版狀態Published - 2020 11月 1

All Science Journal Classification (ASJC) codes

  • 環境工程
  • 環境化學
  • 一般化學工程
  • 可再生能源、永續發展與環境
  • 水科學與技術
  • 一般環境科學
  • 廢物管理和處置

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