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Gold Science and Technology ›› 2015, Vol. 23 ›› Issue (4): 75-79.doi: 10.11872/j.issn.1005-2518.2015.04.075

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Treatment of Cyanide Wastewater by Chemical Precipitation-Electric Adsorption

SONG Yonghui1,2,LEI Siming1,2,ZHOU Jun1,2   

  1. 1.School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an   710055,Shaanxi,China;
    2.Key Laboratory of Gold and  Resource of Shaanxi Province,Xi’an    710055,Shaanxi,China
  • Received:2015-05-03 Revised:2015-06-29 Online:2015-08-28 Published:2015-11-16

Abstract:

Treatment of gold mine wastewater with the characteristics of cyanide,high copper,iron by the chemical precipitation-electric adsorption combined technology,the analyzed and discussed were focused on the reaction principle,the technological process and the result of the reaction.Research shows that the method is viable to treatment wastewater containing high concentration of cyanide.After precipitation by ZnSO4,the precipitation rate of free cyanide,Fe and Cu in wastewater were 100%,85.89% and 99.43%,respectively.After advanced treatment by electric adsorption,the removal rates of Cu,thiocyanate,and free cyanide were 98.68%,43.60% and 99.57%,respectively.The XRD analysis showed that the sediment from zinc sulfate precipitate mainly includes Zn2[Fe(CN)6],Zn(CN)2 and CuCN,and the sediment from the electric adsorption is mainly CuSCN.Sediment and the anode plate after saturated adsorption can be comprehensive treatment and recovery of cyanide and metal,and the wastewater can be returned to the leaching system for recycling at the same time.

Key words: cyanide wastewater, ZnSO4, chemical precipitation, electric adsorption

CLC Number: 

  • TF831

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