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

doi:10.1007/s12613-017-1527-x

Volume 24 Issue 12

Dec. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(12): 1352-1360

Ping Xue, Guang-qiang Li, Yong-xiang Yang, Qin-wei Qin, and Ming-xing Wei, Recovery of valuable metals from waste diamond cutters through ammonia-ammonium sulfate leaching, Int. J. Miner. Metall. Mater., 24(2017), No. 12, pp. 1352-1360. https://doi.org/10.1007/s12613-017-1527-x

Cite this article as:

Ping Xue, Guang-qiang Li, Yong-xiang Yang, Qin-wei Qin, and Ming-xing Wei, Recovery of valuable metals from waste diamond cutters through ammonia-ammonium sulfate leaching, Int. J. Miner. Metall. Mater., 24(2017), No. 12, pp. 1352-1360. https://doi.org/10.1007/s12613-017-1527-x

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Research Article

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

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Corresponding author:
Guang-qiang Li E-mail: liguangqiang@wust.edu.cn
Received: 20 January 2017; Revised: 25 July 2017; Accepted: 9 August 2017

Abstract

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℃ were drawn. Results showed that the optimal parameters for the leaching reaction are as follows:reaction temperature, 45℃; 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℃, and the leaching is controlled by diffusion through the product layer at temperatures above 35℃.
- recovery;
- waste diamond cutters;
- renewable resources;
- ammonia-ammonium sulfate;
- leaching;
- kinetics

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