钨渣回收钽铌研究

《钨渣回收钽铌研究》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、中南大学硕士学位论文钨渣回收钽铌研究姓名：张立申请学位级别：硕士专业：有色金属冶金指导教师：钟晖20080604硕士学位论文摘要实验表明，两种工艺流程均是可行的，得到的富集物具有工业应用价值，同时对于探索从废渣中回收钽、铌等有价元素的有效途径，保证我国钽、铌冶金工业的可持续发展具有较大的意义。关键词：钨渣，钽，铌，硫酸焙烧，钠碱熔融II硕士学位论文ABSTRACTThetungstenresiduefromalkalileachingareoneofthemaincontaminantsinno

2、n-ferrousmetallurgyindustryatpresent．Thetungstenresiduefromalkalileachingaremostlyabandonedanddepositedbysmelternow,Itpollutestheairandthewaterbypillingupforalongtime．Andtherefilemanyvaluableelementstantalum、niobiumandSOoninthetungstenresiduewhichhas

3、higherrecyclingvalue．Therecoveryoftantalumandniobiumfromtungstenresiduedon’trealizeindustrializationatpresent．mainlybecausethegradeoftantalumandniobiumistoolow，theprocessflowofenrichmentandrecoveryiscomplicated，requireespecialequipment．Theywerestudie

4、dtwosimplertechnologyincludingsulphuricacidroasting、acidleaching-sodiumalkalifusing．Itisstudiedthattheprocessflowoftungstenresiduesulphuricacidroasting．TheenrichmentincludingTa2051．76％andNb20511．25％Wasobtainedthroughsulphuricacidroastingwithtungstenr

5、esidue，at200。C，reactiontime60min，liquid-solidratioof3．3：1；leachingat25"C，reactiontime30min，theconcentrationofH202159／L，theconcentrationofH2S0420％，thequantityofNaFis2％ofthequantityoftungstenresidue；crystallizingat98。C．Therecoveryrateoftantalumandniobi

6、umarerespectively56．71％and73．42％．Itisstudiedthattheprocessflowoftungstenresidueacidleaching—III硕十学位论文ABSTRACTsodiumalkalifusing．TheenrichmentincludingZa2050．91％andNb2055．21％wasobtainedthroughacidleachingat400C，reactiontime30min，theconcentrationis5％，t

7、heamountofHClbeing2．5timesofitstheoreticalconsumption，agitationspeed300r／min；sodiumalkalifusingat800。C，reactiontime60min，themassratioofalkaliandacidleachingresidue1．5：1，waterleachingandacidleaching．Therecoveryrateoftantalumandniobiumarerespectively75

8、．07％and62．35％．Thetestsindicatethat，therecoveryandenrichmentoftantalumandniobiumhavediversity,mainlybecausetheexistingstateoftantalumandniobiuminacidizingfluidandalkaliliquorisdifferent，thepropertiesoftantalumniobiumcompoundisdifferent．Thatexistcontra