Preparation of high-purity tellurium powder by hydrometallurgical method.pdfVIP

Preparation of high-purity tellurium powder by hydrometallurgical method.pdf

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Preparation of high-purity tellurium powder by hydrometallurgical method.pdf

RareMet.(2014)33(4):479-484 RAREMETALS D0IlO.1007/s12598—014—0338—8 、IIrww.editorialmanager.com /rmet Preparationofhigh·puritytellurium powderby hydrometallurgicalmethod YuanLiu,Ya-JieZheng ,Zhao—M ingSun Received:12November2013/Revised:5December2013/Accepted:18June2014/Publishedonline:31July2014 ◎ TheNonferrousM etalsSocietyofChinaandSpringer—VerlagBerlinHeidelberg2014 Abstract This hvdrometallurgica1method consists of applications,such as thermalimaging,thermoelectric, oxidation1eaching。sulfideimpuritiesremoving.andsulfur phase—changememory,andphotoelectricdevices[3—7]. dioxidereduction.Thecrudetellurium powderwastreated The perfomr ance of such compounds is known to byH2O,oxidationfor2.0hatPH 2.5whenadding50ml strongly depend on the purity ofstarting materials,in H2O,(30%)per100grawmaterial,atellurium recover which4N tellurium powderisusedasraw materia1.Kinds ratearound91% isachieved.Thetellurium leachingratio ofsyntheticmethodsweredeveloped,suchasvaporphase canreach98.9 %under3.75mo1.L NaOH concentration method [8],spray pyrolysis [9],and electrochemical in liquid—solidratioof5:1at80。C for1.5h.Theoverall reduction 『10]ofrtheprepraationoftellurium powders. sepraationoftellurium andotherheavymetalsisoptimum However.eachprocesshasitsowndrawbacks:hteexten. atsulfide dosagesofabout 1.1timesofthetheoretical siveenergyconsumptionorhtedifficultiesinhtesepraa. values.TheremovalratesofAg,Ni,Pb,andCufrom the tion of Se.The chlorination processrecommended by solutionraegreaterthan99.8%.andAsandSeremoval Hoffmann[11】hasmanyadvantagesinrapidreaction:easy ratesrae98.6% and 97.2 %.respectively.0ver99.5 % controland fastturnoverofhtepreciousmetalsin the tellurium can be recovered by SO, reaction when the slimes,butsomeproblemsasso

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