CIESC Journal ›› 2018, Vol. 69 ›› Issue (9): 3983-3992.doi: 10.11949/j.issn.0438-1157.20180406

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Separation of copper and arsenic in copper smelting dust by Na2S-NaOH leaching assisted with ultrasound method

YAO Yingying1, GUO Li2, HU Zhongqiu1, QUAN Qu1, DU Dongyun1   

  1. 1. Institute of Environment Engineering and Science, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, Hubei, China;
    2. State Key Laboratory of Biological Geology and Environmental Geology, China University of Geosciences, Wuhan 430074, Hubei, China
  • Received:2018-04-18 Revised:2018-06-20 Online:2018-09-05 Published:2018-07-09
  • Supported by:

    supported by the Science and Technology of Hubei Province(2014BEC029).

Abstract:

Selective leaching of arsenic and copper in copper smelting dust was investigated by Na2S-NaOH leaching process with assistance of ultrasound method. The results showed that ultrasound wave could enhance alkaline leaching capacity and separation of arsenic and copper. The corresponding leaching ratios of arsenic and copper reached to 88.81% and 0.025% at the condition of 5 min discharge time, 80 W discharge power, mass ratio of Na2S, NaOH to ash 0.4:1, liquid-solid ratio 20:1, temperature 75℃ and stirring speed 400 r·min-1. The leaching process with Na2S-NaOH assistant with ultrasound reduced arsenic and increase copper content in soot from 0.85% to 0.58% and from 2.21% to 2.30%, and the leaching rate of As increased 9.21%, the leaching toxicity concentration of As was reduced from 12.66 mg·L-1to 2.84 mg·L-1, compared with alkaline leaching, respectively. Kinetics of alkaline assisted with ultrasound leaching of arsenic in copper smelting dust was controlled by hybrid reaction and its leaching kinetic equation followed the reacted shrinking core model, its apparent activation energy was 0.114 kJ·mol-1, and the reaction system was balanced within 5 min. XPS, XRD and speciation analysis of heavy metals indicated that ultrasound wave was able to oxidize As(Ⅲ) to As(Ⅴ), which was propitious to leaching of arsenic. In conclusion, ultrasound wave assisted Na2S-NaOH leaching process proved to be an efficient way of removing both arsenic and copper from soot, so the soot could be further utilized after toxic content reduction.

Key words: copper smelting dust, ultrasound wave, selective leaching, separation, kinetics, interface, oxidation

CLC Number: 

  • X756

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