冶金法多晶矽生产工艺简介ppt课件.ppt

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1、冶金法多晶矽生產工藝簡介新產品開發部：張淑貴太陽能電池對多晶矽中主要雜質含量的最低要求Source:HandbookofPVScienceandEngineering.Wiley8/6/20212典型冶金級矽原料中主要雜質的含量8/6/20213物理冶金法制備多晶矽的主要工藝路線Timminco（SilBec）工藝JFE（Kawasaki）/NEDO工藝Elkem工藝8/6/20214Timminco（SilBec）工藝MG-SiMeltinginarotarydrumfurnacewiththeoxy-fuelburnerSlagtreatmentSepar

2、atefromslagUnidirectionalsolidificationwithelectromagneticallystirringthemeltPosttreatmentMaybecontainingsiliconcrusherdustsiliconhand-pickedfromslagremaindercontainingsilicon.NOTE:siliconcrusherdustispreferabletopelletizebymixingwithSodiumsilicate(liquidglass)/ligninliquor/molass

3、esorsugar/limeorresinwithorwithoutbakingpriortoloading.UsingslagthatalsohasalowPcontent(e.g.aPcontentlessthan4ppmw)Themeltmaybeoutpouredintoareceivingvesselsuchasamould.Theflowofoutpouringmeltcanbecontrolledbyrotatingthefurnace.Thesolidificationisstoppedwhenthemelthaspartiallysolidi

4、fied(saywhen40%~80%ofthemelthassolidified)SoG-Si（5N）8/6/20215Timminco（SilBec）工藝ExhaustductArotarydrumfurnaceTapholeforpourliquidSiCarbonpasteforsealingSiDoorflameOxy-fuelburnerChimneyCanopyWastegascollectorContainingsilicafumesGas:CO2/CO/H2O/O2/H2ExhaustductArotarydrumfurnaceTaphole

5、forpourliquidSiCarbonpasteforsealingSiDoorflameOxy-fuelburnerChimneyCanopyWastegascollectorContainingsilicafumes：fixedRefractoryliningChangingoxy：naturalgas==1.5：1～2.85：1forremovingCa/Al/Mg/Na/K/Sr/Ba/Zn/C/OLargequantityofN2inairremoveslotsofenergyfromtheflameandMax.flametemp.reacha

6、round1200℃1410~1500℃ForprecipitatingCintoslagandreducingOcontentofSibetterTherotarymovementgeneratesnewsurfacesfavourablefortherapidestablishmentofchemicalequilibriumandcontinuallyexposesnewsurfacesofmoltenmaterialtotheslagandtheoxidizingatmosphereforslagextraction.=0.876Mwh/MT8/6/2

7、0216Timminco（SilBec）工藝mouldTappingspoutLiquidSiSeparatingprocessAninsulatedwallAninsulatedwallmouldAnopentopAninsulatedwallAnexteriorshellHighPuritySiliconAnimpurity-enrichedliquidsiliconElectromagneticstirrerSolidificationdirectionCoolingairSource:Patent8/6/20217Timminco（SilBec）工藝—

8、優缺點Advantage:Disadv