Nyob rau hauv daim ntawv no, lub stripped steel slag ntawm pov tseg magnesia-alumina spinel cib thiab khib nyiab magnesia-alumina spinel yog siv los ua cov ntaub ntawv tseem ceeb, thiab cov cement yog siv los npaj cov cib tsis tau tawg. Txhawm rau kom tau txais cov txheej txheem ua tau zoo, nws tuaj yeem muab cov ntaub ntawv siv rau kev siv tag nrho ntawm cov ntaub ntawv refractory tom qab siv.
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1.1 Cov khoom siv raw
Stripped steel slag thiab khib nyiab magnesia-aluminium spinel yog tau tom qab raug stripped, txiav thiab txheeb los ntawm cov cuab yeej xws li rauj thiab tshuab txiav.
(1) Stripping steel slag: Tom qab crushing, pob milling thiab tshuaj ntsuam, peb txawv specifications ntawm 0-1, 1-3 thiab 3-5mm tau. Vim tias 1-3mm thiab 3-5mm stripped steel slag raw cov ntaub ntawv tuaj yeem ua raws li lub cev pob txha hauv cov cib tsis tau hlawv thiab ua lub luag haujlwm txhawb nqa, txhim kho lub zog ntawm cov cib tsis tau tawg thiab txo tus nqi ntawm cib. , yog li ntuj xuab zeb tsis ntxiv rau qhov piv. Cov tshuaj muaj pes tsawg leeg ntawm stripped steel slag yog qhia nyob rau hauv Table 1. Nws tuaj yeem pom tau tias cov khoom siv raw ntawm stripped steel slag yog cov hlau siab (Fe2O3) thiab siab xuab zeb hom (SiO2) hom steel slag, thiab cov theem tseem ceeb ntawm cov hlau slag. stripped steel slag yog dicalcium silicate theem thiab dawb calcium oxide theem; Cov txheej txheej txheej yog ntxeem tau thiab tsis ntom, zoo ib yam li cov microstructure ntawm av nplaum, yog li nws tuaj yeem hloov cov av nplaum los tsim cov cib tsis hlawv. Kev tshuaj xyuas EDS qhia tau hais tias cov ntsiab lus tseem ceeb ntawm exfoliated steel slag yog Si, Mg, Al, Ca, Fe thiab lwm yam.
(2) Nqus magnesia-aluminium spinel: dhau los ntawm 45-mesh sieve tom qab pob milling kom ntseeg tau tias cov khoom siv raw khoom me me ntawm cov qauv yog tsawg dua 0.5nm. Cov khoom tseem ceeb ntawm cov khib nyiab magnesia-aluminium spinel yog Al2O3 thiab MgO; Tom qab kev soj ntsuam, nws tuaj yeem xaus lus tias cov theem tseem ceeb ntawm cov khib nyiab magnesia-aluminium spinel yog periclase theem thiab magnesia-aluminium spinel theem; Nws tuaj yeem pom tias khib nyiab magnesia-aluminium spinel Pob zeb yog txheej txheej txheej. Los ntawm EDS lub zog spectrum tsom xam, nws tuaj yeem pom tias cov ntsiab lus tseem ceeb ntawm cov khib nyiab magnesia-alumina spinel yog Al, Mg, Si, thiab lwm yam, thiab muaj ntau cov khoom txhuas, uas tuaj yeem muab lub zog tsim nyog rau cov cib tsis tau tawg.
(3) Cement: P·O42.5, kev ua tau zoo raws li qhov xav tau ntawm GB175-2007 "General Portland Cement". Cement yog siv los ua cementitious tivthaiv thiab activator nyob rau hauv unburned cib.
1.2 Kev npaj ua qauv
Cov qauv kuaj no yog npaj los ntawm cov txheej txheem ntawm batching, sib tov, molding, thiab kho. Cov txheej txheem batching yog: stripped steel slag yog 60 feem pua , 70 feem pua (sib faib ua peb specifications ntawm 0-1, 1-3, 3-5mm), khib nyiab magnesia-aluminium spinel yog 20 feem pua, 30 feem pua , cement thiab dej raug kho raws li 10 feem pua, 2 feem pua. Cov khoom yog tov los ntawm thawj qhuav sib tov rau 2 feeb, thiab ces ntxiv dej thiab ntub sib tov rau 2 feeb. Tom qab cov ntaub ntawv raw khoom sib tov sib xyaw, cov txheej txheem molding tau txais yuav. Txoj kab uas hla ntawm pwm yog 20 hli thiab molding siab yog 15 MPa. Tom qab demoulding, cov qauv tau kho nyob rau hauv chav tsev kub thiab siab rau 28 d, thiab dej txau txhua txhua 3 d los tiv thaiv cov qauv ntawm kev tawg, thiaj li yuav tau txais cov qauv cib tsis tau hlawv. Nyob rau hauv cov txheej txheem molding, lub siab ntawm 10MPa tau siv rau molding ua ntej, thiab nws tau pom tias cov qauv tsis tau ua tiav, thiab cov hmoov poob. Thiab los ntawm kev sib piv, nws pom tau tias lub zog compressive ntawm cov qauv tsim nyob rau hauv lub siab ntawm 15MPa yog siab dua li cov qauv tsim nyob rau hauv lub siab ntawm 10MPa.
1.3 Kev ntsuas tus yam ntxwv thiab kev ua haujlwm zoo
(1) Siv D / max-rA qauv X-ray diffractometer ntawm Rigaku Tuam Txhab Nyij Pooj, cov theem tsom xam ntawm cov khoom siv raw ntawm steel slag thiab magnesia-alumina spinel thiab cov cib tsis tau tawg tom qab tsim thiab kho tau ua tiav.
(2) S-3000N scanning electron microscope ntawm Hitachi, Nyiv tau siv los ua tus yam ntxwv ntawm cov qauv, qauv, cov duab thiab kev faib tawm ntawm cov cib tsis tau tawg.
(3) Siv lub tshuab ntsuas hluav taws xob thoob ntiaj teb (CTM4304, Tuam Tshoj MTS Tuam Txhab), cov kev sim compressive thiab flexural zog ntawm cov qauv cib tsis tau tawg.
Cov txiaj ntsig thiab Kev Ntsuam Xyuas
2.1 Ntau qhov ntom ntom thiab nqus dej ntawm cov cib tsis tau hlawv
(1) Qhov ntau ntom ntawm cov cib tsis tau hlawv qhia tau hais tias tag nrho cov kev sib tw nrog kev nce ntawm stripped steel slag cov ntsiab lus thiab txo cov khoom pov tseg magnesia-alumina spinel. Thaum cov gradation ntawm peeled steel slag hais yog 0-1mm25 feem pua , 1-3mm25 feem pua , thiab 3-5mm20 feem pua , qhov ntau ceev ntawm lub unburned cib yog qhov loj tshaj plaws. yog 2863kg/m3. Yog vim li cas tej zaum yuav yog cov ntsiab lus ntawm exfoliated steel slag nyob rau hauv cov qauv nce, thiab qhov ceev ntawm exfoliated steel slag yog siab dua li ntawm cov khib nyiab magnesia-alumina spinel, uas ua rau kom nce ntawm tag nrho cov ceev ntawm unburned cib. (2) Thaum cov particle gradation ntawm peeled steel slag yog 0 ~ 1mm15 feem pua, 1 ~ 3mm15 feem pua, 3 ~ 5mm30 feem pua, cov dej nqus tus nqi ntawm lub unburned cib yog qhov tsawg tshaj plaws, uas yog 6.07 feem pua, thiab yog vim li cas tej zaum yuav 30% pov tseg magnesia-aluminium spinel. Cov hmoov thiab 0-1 hli exfoliated steel slag tag nrho cov voids nyob rau hauv lub cev pob txha ntawm lub unburned cib, uas ua rau ib tug txo nyob rau hauv cov dej nqus ntawm cov qauv. Thiab qhov nqus dej ntawm cov qauv yog tag nrho raws li cov kev xav tau ntawm cov dej nqus tsawg dua 18 feem pua hauv JC/T422-2007 "Non-sintered khib nyiab Tailings Bricks" tus qauv.
2.2 Dimensional deviation ntawm unburned cib
Txij li thaum lub active Cheebtsam xws li C2S, C3S, thiab calcium ferric aluminate nyob rau hauv lub peeled steel slag yog gelatinous, ib tug activator uas yuav ua rau kom cov kev ua ntawm cov cement tuaj yeem tsim thaum lub sij hawm hydration, thiab cov cement activated yuav ua rau lub ntim ntawm cov cib tsis hlawv. Kev nthuav dav, yog li nws muaj qee yam cuam tshuam rau qhov loj ntawm cov cib tsis tawg.
Hauv qhov kev sim no, tus nqi ntawm cov cement siv yog 10 feem pua, thiab qhov hloov pauv ntawm radial thiab axial dimension ntawm lub workpiece yog me me, thiab tsis muaj kab nrib pleb tshwm rau saum npoo. Nyob rau hauv txoj kab nrog JC/T422-2007 "qhov tshwm sim thiab qhov sib txawv me me tsawg dua 2 hli yuav tsum tau ua.
nyob rau hauv xaus
(1) Kev tsim siab thiab qhov sib piv ntawm cov khoom siv raw muaj kev cuam tshuam rau kev ua haujlwm ntawm cov cib tsis tau tawg. Cov txheej txheem kev npaj ua kom zoo tau txais los ntawm kev tshawb fawb yog: tev steel slag 0-1mm25 feem pua, 1-3mm15 feem pua, 3-5mm20 feem pua, magnesium-aluminium spinel 30 feem pua, cement 10 feem pua, molding siab 15 MPa.
(2) Ntxiv rau qhov qub magnesium oxide thiab calcium sulfate, cov cib uas tsis tau hlawv kuj tseem tsim cov theem tshiab ntawm serpentine. Kev soj ntsuam morphological qhia tau hais tias cov cib tsis kub hnyiab muaj cov qauv cladding thiab inlaid, thiab cov khoom zoo ntawm magnesia-alumina spinel yog embedded nyob rau hauv lub cev tsis tu ncua exfoliated steel slag skeleton, uas plays lub luag hauj lwm filling thiab ua rau cov tsis-hlwb cib ntom.
(3) Hauv qhov kev sim no, qhov tsawg kawg nkaus qhov nqus dej ntawm cov pob zeb uas tsis tau hlawv yog 6.07 feem pua, thiab qhov siab tshaj plaws compressive zog yog 9.57MPa, uas ua tau raws li tus qauv yuav tsum tau ua ntawm JC/T446-2000 "Concrete Pavement Bricks ". Qhov kev sim no yog qhov tseem ceeb heev rau kev siv tag nrho cov khoom siv refractory tom qab siv.
