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1、Separationofsilverfromsilver-manganeseorewithcelluloseasreductantSciencePressAvailableonlineatwww.sciencedirect.corn●C1.1IMCtTrans.NonferrousMet.Soc.China16(2006)705—708TransactionsofNonferrousMetalsSocietyofChinawww.CSU.edu.cn/ysxb/Separationofsilverfromsilver-mangorewithcellulosereductantIS
2、eparatlonotSllVerIromSliver-manganeseoreWltllcelluloseasreauctantZHANGXiao.ynn(张小云),TIANXue-da(田学达),ZHANGDong-fang(张东方)CollegeofChemicalEngineering,XiangtanUniversity,Xiangtan411105,ChinaReceived21November2005;accepted3April2006Abstract:Thesilverinsomesilver-manganeseorewithagradeof3.15×l0'wa
3、sconcentratedbyacombinedbeneficiationtechniqueincludingmagneticseparation,flotation,reducingleachingandgravitydesliming.nlemajorsilvercontainedinmanganeseoreasisomorphismwasconcentratedbymagneticseparation.whilearound8.5O%ofthesilverindividualmineralswereseparatedbyflotation.Themanganeseinthe
4、mixedconcentrateofbommagneticseparationandflotationwasdissolvedinareducingleaching.inwhichsomeeelhlosereductantnamedCMKwasused.Partoftheslimecontainedinleachresiduewasremovedbyalaboratorydeslimingequipment.Asilverconcentratewithagradeof4.96×l0_,Agandarecovery0f84-25%wereobtained.Keywords:silv
5、er;silver-manganeseore;magneticseparation;flotation;reducingleaching;desliming1lntroductionSilver-manganeseorehasbeenfoundinInnerMongolia,Shanxi,Hebei,HunanandGuangxi,soitisanimportantsilverSOUl'CeinChina.Generally,thebeneficiabilityofthesilverinthisoreisdifferentfrominothersilvermineralsduet
6、oitsspecialproperty.Themineralcompositionanalysisshowedthatsilverpresentsmainlyinthemanganeseoxidizedmineralssuchaspsilomelaneandpyrolusitethroughisomorphism,onlyasmallfractionofthesilverpresentsinindividualminerals[1].Methodtorecoversilverfromsilver-manganeseoreconsiderablydependsonthegrades
7、ofAgandMn,grindability,chemicalandphysicalproperty,associationanddisseminationsizeofminerals.Therearevariousapproaches[2,3】,whichcanbeclassifiedintotwobroadcategories,i.e.flotationandmagneticseparation[4].Silverindividualmineralsofgoodfloatab
