A soft-solution process for recovering rare metals from metal/alloy-wastes by grinding and washing with water

Qiwu Zhang, Shu Saeki, Yasumitsu Tanaka, Junya Kano, Fumio Saito

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

We have developed a novel process for recovering metals from alloy-wastes by using a mechanochemical (MC) reaction. The process consists of co-grinding both alloy and polyvinyl chloride (PVC) samples, followed by washing with water and filtration. The co-grinding of the wastes causes a solid-state MC reaction to form metal chlorides and hydrocarbon in the product. The former products are soluble in water, so they can be recovered from the wastes by washing with water, followed by filtration. The PVC waste plays a significant role as a chlorine source in the MC reaction. After filtration, the solid residue can be used as a fuel, due to the absence of chlorine in the product, and the filtrate is subjected to hydrometallurgical process to extract metals from the solution.

Original languageEnglish
Pages (from-to)438-442
Number of pages5
JournalJournal of Hazardous Materials
Volume139
Issue number3
DOIs
Publication statusPublished - 2007 Jan 31

Keywords

  • Dechlorination
  • Mechanochemical reaction
  • Rare metals
  • Recycling

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution
  • Health, Toxicology and Mutagenesis

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