拜耳法氧化铝工艺废渣制备建材及机理探讨

华中科技大学硕士学位论文拜耳法氧化铝工艺废渣制备建材及机理探讨姓名：段光福申请学位级别：硕士专业：环境工程指导教师：杨家宽20070609IXRDFSEM25%15%38%10%12%20MPa1800.8MPa8hGB11945-199915CGB6566-20011.000.48mm/m8016hGB11945-199915C30%34%45%51%12%15%3%5%0%3%20MPa1800.8MPa8h8011hJC239-2001MU15XRDFSEM95wt%50005000950II0.140.18/2005IIIAbstractRedmudbricksandflyashbrickshavebeenpreparedfromBayerredmud,flyash,coal-burningslag,limeorcalciumcarbideresidue,gypsumandcement.Thepreparationprocesscompriseswheel-rollingblending,moldingwithhighpressure,andsteamcuringprocess.Bayerredmud,flyashandcoal-burningslagarefromCoalmineAluminaSanmenxiaCompanyLimit.Effectsofthefactorsonthecompressiveandbendingstrengthandfrostresistanceareanalyzed.ThemechanismofstrengthisstudiedbyXRDandFSEMtechniques.Theconstructionandtheengineeringeconomystudiesoftheactualizedflyashbricksproductionlineareintroduced.Theexperimentalresultsofredmudbricksshowthatwhenthebrickspreparedfrom25%redmud,15%flyash,38%coal-burningslag,10%hydratedlime,12%cement,pressuremoldingat20MPa,thenautoclavingfor8hat180,0.8MPa,thestrengthcanreachthestandardof15C(GB11945-1999);radiumactivityconcentrationsarelowerthelimitinmainbuildingmaterials(GB6566-2001);thecoefficientofcarbonizationis1.00;andthedryingshrinkageis0.48mm/m.Whilesubstitutingquicklimeforhydratedlime,reducingthecontentofcementandaddingasmallamountofgypsum,steamcuringfor16hat80,thecompressiveandbendingstrengthandfrostresistanceofbrickscanalsoreachthestandardof15C(GB11945-1999).Theexperimentalresultsofflyashbricksshowthatwhenthebrickspreparedfrom30%34%flyash,45%51%coal-burningslag,12%15%hydratedlimeorcalciumcarbideresidue,3%5%cementand0%~3%gypsum,pressuremoldingat20MPa,thensteamcuringfor11hat80orautoclavingfor8hat180,0.8MPa,thecompressiveandbendingstrengthandfrostresistancecanreachthestandardofMU15(JC239-2001).TheXRDandFSEManalysisofthespecimensindicatethatettringiteandotherkindsofCaliumHydroaluminosulfatearegeneratedwhentheredmudbricksandflyashbricksIVsteamcuringat80andtheirrawmaterialsaddedintogypsum.Ettringitecontributesmostlytothestrengthofthebrickswhensteamcuringat80.Whenthebricksareautoclavingat180,ettringitedecomposed.Thedecompositionofettringiteinducesthedeclineofthestrengthofthebricks.Onthebaseofnumerousexperiments,integratingwithlocalsituationoftheShancounty,Sanmenxiacity,Henanprovince,aflyashbrickproductionlinewithanoutputof50millionblocksperyearwasbuilt.Thetotalcontentofcalciumcarbideresiduewhichisasmainactivator,flyashandcoal-burningslagismorethan95%.Atpresent,thetechnologyofthisproductionlineisadvancedathome.Theengineeringeconomystudiesoftheproductionlineshowthatthetotalinvestmentisabout9.5millionyuan,thecostperblockis0.14yuan.Thegrossprofitis2millionyuanperyearifthesellingpriceis0.18yuanperblock.Thetotalinvestmentcouldbetakenbackinfiveyears.Keywords:Bayerredmudredmudbricksflyashbrickscalciumcarbideresiduecoal-burningslagettringiteengineeringeconomy111.11.2A2O3[1]Al2O3Al2O3Al2O3Al2O3Al2O31t1~1.5t1t1.5~2.5t[2][3]501.3g/L[4]50[5]22006122006137059.4%[6]20044200512200612120t/1t1.21.5t150t/10km1.31.3.11200510.3843.73%[7][810]A12O3Na2O750950β-2CaOSiO23“”[11]ManeeshSinghHINDALCO125028[12]P.E.Tsakiridis3.5%[4]2[13~16]TanerKavas851590040MPa9MPa[17]Kara,M[18]1.3.21BharatMaitra[19]15%18%Ti02Ti02HCl9095pH4HCI4Si02Ti02Ti02TiO2·2H2OTi02Ti02[20]PicaroTi02[21]Ti0226080[22]Fe84.17%86.96%91.49%[23]A91.79%91.15%Fe40%[24]0.04mm82.6%76.5%51.3.3(αFe3O2)(αFeOOH)(Al2O3·H2O)(Na2O·Al2O3·1.68SiO2·1.73H2O)(CaCO3)1[25,26]Fe2O330%~50%,H2SH2S2[27][28][29][30][31][32]1.3.4[33][34][35][3637][38][39]1.4Al2O36130t/h201061.5SO2CO27[2005]332010,1.6123XX-rayDiffractionXRDFliedEmissionScanningElectronmicroscopeFSEM4822.140%2.1.12-12-22-32-42-1wt%SiO2CaOAl2O3Fe2O3MgOTiO2Na2OSO3LOI17.6818.523.37.811.006.56.92--42.42.9830.057.710.541.140.211.384.1450.8816.6613.144.351.370.610.510.578.1549.457.3429.843.160.530.982.750.465.122-2wt%CaOTCaOfMgOSiO2Fe2O3Al2O3CO275.2650.453.990.222.242.1368.93464.892.460.650.56.082-3wt%11469273892-4226RaBq/kg386.00232ThBq/kg614.9040KBq/kg16.531.93.440%50%20%30%2.1.22-510mm2-5(mm)105210.50.30.075%017254453961002.1.3Ca(OH)290%80%40%4-20.5mm0.5mm325#102.22.2.12-12-1SHQ30(240×115×53mm)JYE-200015%20MPaYXQ-LS-50S1800.8MPa8h8016h2-6112-6()60708090100110115(kPa)19.92331.16447.87570.136101.330143.310169.1102.2.2GB/T2542-20032.2.3JC239-2001GB11945-19991233.1GB6566-200130%3-15mm20MPa3-1%%%%%K11524431082816hK22021411082816hK32717381082816h3-1036912151815%20%27%/MPa0%3%6%9%12%15%18%3-1133-13.210mm10mm3-2k4k5k610mmk7k8k95mm3-2%%%%%K42715361012K5272036512K6034441210K72715361012K8272036512K90344412103-23-314036912151821k4/k7k5/k8k6/k9/MPa(10mm)(5mm)(10mm)(5mm)3-20369121518k4/k7k5/k8k6/k9/MPa0%3%6%9%12%15%18%21%(10mm)(5mm)(10mm)(5mm)3-33-23-310mm5mm10mm3.33-3153-3%%%%%K10272140012K11272038312K12272036512K1327153610123-40369121518210%3%5%10%/MPa0%3%6%9%12%15%3-43-4310%~15%3.43.4.10.8MPa1808h8016hk133-516.03691215182124123/MPa3-53-53.4.23-43-4%%%%%%K1325153810012K142520371233K152517381235K1625163612383-6170369121518212427K13K14K15K16/MPa3-63-63.4.33-53-5%%%%%%K1325153810012K172516361238K182520381