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《Journal of Northeastern University(Natural Science)》 2011-11
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E-pH Diagram of Pretreatment of Leaching for Refractory Gold Ore

KIM Chang-sok1,2,ZHANG Ting-an1,MU Wang-zhong1,ZENG Yong1(1.Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores,Ministry of Education,Northeastern University,Shenyang 110819,China;2.Kimchak University of Technology,Department of Physical Chemistry,Pyongyang 999093,DPR of Korea.)  
E-pH diagrams of FeS2-H2O system and FeAsS-H2O system at 298.15 K were drawn to provide the thermodynamic basis for the pretreatment of pyrite and arsenopyrite before leaching.According to E-pH diagram of FeS2-H2O system,pyrite can be decomposed by O2 and other oxidants.The stable region of sulfur element is small and sulfur exists as HSO-4 and SO2-4 basically in the stable region of water.According to E-pH diagram of FeAsS-H2O system,the decomposition of arsenopyrite is easier than pyrite.Oxidation potential was improved to oxidize sulfur and arsenic to be removed and avoid the formation of arsenite and sulfur elements during the pretreatment process.Verification of pressure oxidation was carried out with refractory gold ore.When the temperature,concentrate particle size,oxygen partial pressure,initial acid concentration,liquid-solid mass ratio,reaction time and stirring speed are 180 ℃,-0.075~+0.061 mm,0.8 MPa,60 g/L,4∶1,120 min andd 600 r/min respectively,average desulfurization rate is 93.85% and average arsenic removal rate is 95.91%.The experiment results are in good agreement with the calculation results of E-pH diagram.
【Fund】: 国家“十一五”科技支撑计划项目(2008BAB34B01);; 国家自然科学基金资助项目(51004033 50974035 51074047)
【CateGory Index】: TD953
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