Recovery of valuable metals from waste diamond cutters through ammonia–ammonium sulfate leaching

Ping Xue, Guang qiang Li, Yong xiang Yang, Qin wei Qin, Ming xing Wei

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Copper and zinc were recovered from waste diamond cutters through leaching with an ammonia–ammonium sulfate system and air as an oxidant. The effects of experimental parameters on the leaching process were investigated, and the potential–pH (E–pH) diagrams of Cu–NH3–SO4 2−–H2O and Zn–NH3–SO4 2−–H2O at 25°C were drawn. Results showed that the optimal parameters for the leaching reaction are as follows: reaction temperature, 45°C; leaching duration, 3 h; liquid-to-solid ratio, 50:1 (mL/g); stirring speed, 200 r/min; ammonia concentration, 4.0 mol/L; ammonium sulfate concentration, 1.0 mol/L; and air flow rate, 0.2 L/min. The results of the kinetics study indicated that the leaching is controlled by the surface chemical reaction at temperatures below 35°C, and the leaching is controlled by diffusion through the product layer at temperatures above 35°C.

Original languageEnglish
Pages (from-to)1352-1360
JournalInternational Journal of Minerals Metallurgy and Materials
Volume24
Issue number12
DOIs
Publication statusPublished - 2017

Keywords

  • ammonia–ammonium sulfate
  • kinetics
  • leaching
  • recovery
  • renewable resources
  • waste diamond cutters

Fingerprint Dive into the research topics of 'Recovery of valuable metals from waste diamond cutters through ammonia–ammonium sulfate leaching'. Together they form a unique fingerprint.

  • Cite this