简介:ThispaperpresentstheeffectofmineralizationonchalcopyritechemicalleachinginverysimpleH2SO4solutionsystemsatpH1.0,with5%chalcopyriteconcentrateat65℃.Thecopperextractionsafter12daysleachingofmarinevolcanicandporphyrychalcopyritewere85.7and66.6%,respectively.ItwasfoundthatsulphurelementformedonthesurfaceoftwosamplesasaresultofXRDandSEM-EDAX,whichwasveryporousthatdidnotinhibitchemicalleachingreaction.Meanwhile,(Cu,Fe)12As4S13formedonthesurfaceofporphyrytypechalcopyrite,whichmaycauselowleachingratioofporphyrytypechalcopyriteaspassivation.(Cu,Fe)12As4S13maybeonekindofthepolysulphidecompounds.
简介:Changesoftheaveragebrightnessandnon-uniformityofdarkoutputimages,andqualityofpicturescapturedundernaturallightingforthecolorCMOSdigitalimagesensorsirradiatedatdifferentelectrondoseshavebeenstudiedincomparisontothosefromtheγ-irradiatedsensors.Fortheelectron-irradiatedsensors,thenon-uniformityincreasesobviouslyandasmallbrightregiononthedarkimageappearsatthedoseof0.4kGy.Theaveragebrightnessincreasesat0.4kGy,increasessharplyat0.5kGy.Thepictureisveryblurryonlyat0.6kGy,showingthesensorundergoessevereperformancedegradation.ElectronradiationdamageismuchmoreseverethanγradiationdamagefortheCMOSimagesensors.Apossibleexplanationispresentedinthispaper.