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

*Corresponding author for this work

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (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

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