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1、第35卷第6期稀有金屬2011年11月Vol.35No.6CHINESEJOURNALOFRAREMETALSNov.2011熔鹽電解法制備高鈦鐵合金*李晴宇,杜繼紅,奚正平,李爭顯,楊承本(西北有色金屬研究院腐蝕與防護研究所,陜西西安710016)摘要:采用電化學(xué)還原法,溫度為900℃,在CaCl2熔鹽中以燒結(jié)的TiO2與鈦鐵礦混合物(Ti∶Fe=1∶1原子比)為陰極,石墨棒為陽極,制備出了高鈦鐵合金。探討了混合物燒結(jié)后的相組成變化及高鈦鐵合金的合金化歷程。實驗結(jié)果表明,混合物燒結(jié)后,TiO2由銳鈦礦結(jié)構(gòu)轉(zhuǎn)變?yōu)榻鸺t石結(jié)構(gòu)
2、,鈦鐵礦轉(zhuǎn)化為熱力學(xué)穩(wěn)定的Fe2TiO5。鈦鐵礦的晶體結(jié)構(gòu)由燒結(jié)前的三方晶系經(jīng)950℃以上燒結(jié)后,轉(zhuǎn)變?yōu)樾狈骄档腇e2TiO5。制備出的高鈦鐵中鐵鈦含量分別為:77.19%和9.68%(質(zhì)量分?jǐn)?shù))。其合金化歷程為:TiO2先生成CaTiO3,然后繼續(xù)脫氧還原為金屬鈦;鈦鐵礦優(yōu)先還原出金屬鐵,然后與生成的金屬鈦發(fā)生合金化反應(yīng)生成鈦鐵合金。表明熔鹽電解TiO2與鈦鐵礦的混合物是一條制備高鈦鐵合金的新途徑。優(yōu)化電解條件提高電流效率可進一步提高電解速度,得到質(zhì)量更高的高鈦鐵合金。關(guān)鍵詞:鈦鐵礦;TiO2;熔鹽電解;高鈦鐵合金do
3、i:10.3969/j.issn.0258-7076.2011.06.007+中圖分類號:TG146.414文獻標(biāo)識碼:A文章編號:0258-7076(2011)06-0829-06PreparationofHighTitaniumFerroalloybyMoltenSaltElectrolysisfromMixtureofTiO2andIlmenite*LiQingyu,DuJihong,XiZhengping,LiZhengxian,YangChengben(CorrosionandProtectionResearch
4、Center,NorthwestInstituteforNon-FerrousMetalsResearch,Xi'an710016,China)Abstract:Hightitaniumferroalloywaspreparedbyelectro-deoxidizationmethod.UsingCaCl2moltenaselectrolyte,sinteredTiO2andilmenitemixedoxidespalletsascathode,graphiterodasanode,thepalletswereelectr
5、olyzedat900℃,3.1Vfor6,8and12h.ThephasestructureofmixtureofTiO2+ilmeniteafter950℃sinteredandmechanismofelectro-deoxidizationofthemixturewasstud-ied.Theresultshowedthatafter950℃sintered,thestructureoftheTiO2wastransformedfromanatasetorutile,andtheilmenitewastransfor
6、medfromthermodynamicstablephaseFe2TiO5,whichcrystalstructurewasmonoclinec.ThecontentsofTiandFeofproducedhightitaniumferroalloywas77.19%and9.68%(massfraction)separately.Themechanismofelectro-deoxidizationofmixtureofTiO2andilmeniteinthemoltensaltwasthatTiO2formedCaT
7、iO3firstly,thenCaTiO3wasreductedtoTi.Thedeoxidizingofilmenitegener-ateFepriority,onceTimetalwasformed,thetwokindsofmetalsolutedeachothertoformhightitaniumferroalloy.Thus,moltensaltelectrolysiswasanewwaytoproducehightitaniumferroalloyfromthemixtureofTiO2andilmenite
8、.Optimizingtheelectrolytictechnol-ogyconditionstoimprovetheefficiencyoftheelectriccurrentandincreasetherateoftheelectrolysis,sohighqualityhightitaniumfe