TN751 : Paste Production and Strong Mechanism (PPSM) Cyanide Removal before Entering to Aq-Darreh Tailing Dam
Thesis > Central Library of Shahrood University > Mining, Petroleum & Geophysics Engineering > MSc > 2017
Authors:
Mohammad [Author], Kumars Seifpanahi-Shabani[Supervisor], Amin Seyed [Advisor]
Abstarct: In this research, Aq-Darreh gold mine wastewater treatment to decrease of cyanide of PPSM output was considered. So, cyanide removal was investigated by three approaches consist of advance oxidation, adsorption and the combination of them. NaClO, Ca(ClO)2, H2O2, Fenton and H2O2+Cu(II) oxidants were used for this performance. Firstly, the effect of major parameters consist of pH, temperature, oxidant dosage and reaction time on cyanide degradation was studied. The optimal pH for oxidants was obtained as 12, 11, 10, 8 and 10, respectively. Nonlinear kinetic modeling and process activation energy was calculated for all five oxidants, which highest and lowest values of kinetic rate was obtained for Fenton: 0.01692 and H2O2: 0.0000918, respectively. Also, highest and lowest values of activation energy as obtained for NaClO: 94.96 and H2O2+Cu(II): 8356 KJ/mol, respectively. According to technical-economical study of advance oxidation process, H2O2 (6.2 m$/year) and Ca(ClO)2 (1.4 m$/year) have highest and lowest cost of treatment. Secondly, Milk vetch chemically activated to preparation of carbon active as adsorbent was used for removal of cyanide. The characterization of physicochemical and surface morphological properties of activated carbon was studied by SEM, XRD, XRF and IR analysis. So, the effect of major parameters consist of pH, temperature, adsorbent dosage and reaction time on cyanide adsorption was studied and the optimal condition as: pH=8, reaction time=75 min, adsorbent dosage=0.3 g and temperature=35 °C. Also, the adsorption of cyanide follow the Sips isotherms and pseudo first order kinetic models. Finally, cyanide removal was considered by combination of adsorption and advance oxidation processes, respectively, which this affaire lead to decreasing the cyanide treatment time and oxidants dosage consumption.
Keywords:
#Cyanide #Advance oxidation process #Adsorption #Nonlinear Kinetic Modeling Link
Keeping place: Central Library of Shahrood University
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