Yog tias koj yuav cov refractories yooj yim rau steelmaking, nonferrous furnaces, los yog siab - coj qhov chaw kiln,tuagburned magnesiayog ib qho ntawm feem ntau "zoo li zoo sib xws, ua txawv" cov ntaub ntawv. Ob txoj kev xa khoom ntawm DBM tuaj yeem muaj tib MgO% ntawm daim ntawv tab sis coj txawv txawv hauv kev sib xyaw, sintering, hydration resistance, thiab hauv ob sab phlu.
1) Dab tsi "deadburned magnesia" tiag tiag txhais tau tias
DBM hais txog magnesia uas tau calcined ntawm qhov kub thiab txias kom txo tau kev ua si thiab txhim kho kev ruaj ntseg. Nyob rau hauv kev xyaum, tuag hlawv magnesia raug xaiv vim nws muaj siab refractoriness, muaj zog yooj yim corrosion kuj, thiab zoo compatibility nrog MgO-raws li systems. Tab sis DBM tsis yog ib qib zoo ib yam. The performance of dead burned magnesia depends on impurity chemistry, crystal size, densification, grain shape, and-most importantly-reactivity.
Ib qho pitfall feem ntau yog kho magnesia xuab zeb li sib hloov nrog fused magnesia. Nws tuaj yeem ua tau zoo heev, tab sis nws xav tau kev txheeb xyuas nruj dua vim tias nws lub qhov rai reactivity dav dua. Yog tias koj lub hauv ob sab phlu lossis castable yog rhiab heev rau hydration, binder xav tau, los yog slag nkag mus, qhov tsis ncaj ncees lawm DBM tuaj yeem nce dej thov, txo lub zog, lossis ua rau muaj kev pheej hmoo ntau ntxiv.
2) COA cov khoom tseem ceeb
COA rau cov tuag hlawv magnesia yuav tsum ua ntau tshaj li cov npe MgO%. Rau cov neeg yuav khoom lag luam, cov khoom COA hauv qab no cais dbm ruaj khov los ntawm "siab MgO, tsis muaj kev ntseeg siab" cov khoom:
Chemistry (loj + tseem ceeb impurities)
Rau deadburned magnesia, tshuaj xyuas:
MgO (%): qhov taw qhia qib hauv qab, tab sis tsis yog tag nrho zaj dab neeg rau cov magnesia tuag.
SiO₂, CaO, Fe₂O₃, Al₂O₃: cov no tsav cov kua theem tsim, slag cuam tshuam, thiab kub lub zog. Hauv ntau daim ntawv thov, impurity tshuav nyiaj li cas ntau dua li qhov me me MgO% sib txawv hauv magnesia.
B₂O₃ thiab alkalis (Na₂O/K₂O) thaum siv tau: me me tuaj yeem cuam tshuam rau siab -tus cwj pwm kub ntawm cov hlau nplaum tuag hauv qee lub tshuab.
Lub cev muaj zog
Nug rau:
Bulk density (BD) thiab pom meej porosity (AP): Siab dua BD thiab qis AP feem ntau qhia tau hais tias zoo dua sintering thiab qis infiltration nyiam rau deadburned magnesite.
Cov cheeb tsam tshwj xeeb (SSA) yog muaj: muaj txiaj ntsig zoo rau cov khoom siv tshuaj tua hluav taws kub hnyiab.
Grain size distribution (PSD): Rau deadburned magnesite siv los ua aggregate, PSD yuav tsum phim koj formulation thiab installation txoj kev.
Mineralogical thiab microstructure cues (feem ntau ploj lawm, tab sis tseem ceeb)
Yog tias tus neeg muag khoom tuaj yeem muab tau, thov:
XRD theem kuaj (dawb cov kua qaub qhia, theem nrab theem)
Microstructure / Crystal loj piav qhia rau cov tuag hlawv magnesia (coarse crystal DBM vs zoo siv lead ua DBM tuaj yeem coj txawv txawv)
Sintering℃pov thawj (duab, SEM cov ntsiab lus, lossis daim ntawv QC sab hauv)
Cov lus qhia txog kev yuav khoom: Yog tias COA rau dbm tsuas yog chemistry tsis muaj BD / AP / PSD, koj tab tom yuav qhov muag tsis pom.
3) Reactivity: qhov sib txawv ntawm qhov sib txawv hauv kev ua haujlwm ntawm magnesia tuag
Reactivity yog qhov nyiam ntawm cov tuag hlawv magnesia kom hydrate lossis cuam tshuam sai nrog dej thiab binders. Reactivity cuam tshuam:
Sib tov dej xav tau hauv castables uas muaj dbm
Teeb tsa tus cwj pwm thiab kev ua haujlwm
Hydration kuj nyob rau hauv cia thiab tom qab installation
Ntev - lub sij hawm nyob ruaj khov
Yuav ua li cas los ntsuas qhov kev ua haujlwm tsis muaj kev sim hauv chav sim
Cov neeg yuav khoom feem ntau tso siab rau ib lossis ob qhov kev qhia ua haujlwm rau kev tuag hlawv magnesia reactivity:
Citric acid test (los yog zoo sib xws): Ib qho kev siv ceev ceev los ntsuas qhov kev ua haujlwm magnesia tuag. Kev cuam tshuam sai dua tuaj yeem cuam tshuam kev ua haujlwm siab dua.
Kev soj ntsuam dej / slaking: Yog tias cov hmoov av kub hnyiab tau sov, ncuav mog qab zib, lossis qhia tias muaj zog noo noo nyob rau hauv cov txheej txheem cia, reactivity yuav siab dhau rau koj daim ntawv thov.
LOI (Poob ntawm Ignition): Tsis yog ib qho kev ntsuam xyuas ncaj qha, tab sis qhov txawv txav LOI tuaj yeem qhia tau tias cov dej noo los yog carbonates hauv cov hlau nplaum uas tuag taus.
Sib piv reactivity rau daim ntawv thov
Tsis yog txhua daim ntawv thov xav tau qhov tsawg tshaj plaws reactivity magnesia xuab zeb . Lub hom phiaj yog tswj reactivity:
Rau hydration -sensitive castables, xaiv qis dua -reactivity deadburnt magnesia thiab thov pov thawj.
Rau qee lub tshuab cib nias, koj tuaj yeem zam me ntsis ntau reactive tuag hlawv magnesia yog tias tag nrho cov densification thiab sintering muaj zog.
Rau kev xa khoom hauv hiav txwv ntev lossis huab cua ntub, qis dua -reactivity deadburned magnesite feem ntau muaj kev nyab xeeb dua.
4) Cov kev pab cuam muag khoom
Nov yog qhov feem ntau cov neeg yuav khoom yuam kev nrog deadburned magnesia, thiab yuav ua li cas kom tsis txhob lawv:
Pitfall A: Yuav tsuas yog MgO%
Lub siab MgO% magnesite tseem tuaj yeem ua tsis tau zoo yog tias qhov porosity siab lossis tsis muaj peev xwm tswj tau. Ib txwm yuav tuag hlawv magnesia nrog BD / AP + PSD + reactivity qhia.
Pitfall B: Tsis quav ntsej PSD qhov sib xws
Txawm tias thaum chemistry ruaj khov, hloov PSD hloov cov ntim ntim thiab cov ntaub ntawv xav tau. Yog tias koj cov castable nyob ntawm kev ntim khoom, tsis sib xws magnesia xuab zeb .PSD tuaj yeem hloov pauv, lub zog, thiab rov ua haujlwm. Yuav tsum tau soj ntsuam sieve rau deadburnt magnesia ntau.
Pitfall C: Tsis muaj kev pom zoo rau kev kuaj thiab txais
Yog tias tsis muaj tus qauv pom zoo, tus neeg yuav khoom tuaj yeem kuaj ib lub hnab thaum tus neeg muag khoom kuaj cov khoom sib xyaw. Rau dbm, txhais: qauv qauv, khaws cia cov qauv, kuaj cov khoom, thiab kev lees paub ntau yam.
Pitfall D: Piv txwv tias "DBM" sib npaug "tsawg hydration txaus ntshai"
Qee qhov tuagburned magnesite muaj zog ntau dua li qhov xav tau vim calcination variability los yog nplua cov ntsiab lus. Yog tias muaj teeb meem hydration tseem ceeb, kho cov kab mob tuag taus zoo li kev tswj hwm - cov tswv yim tseem ceeb thiab txheeb xyuas qhov ua kom muaj zog.
Pitfall E: Tsis muaj zog ntim thiab tswj dej noo
Deadburned magnesite tuaj yeem khaws cov dej noo thaum caij tsheb npav. Yog tias lub ntim yog nyias lossis pallets tsis raug kaw, koj tuaj yeem tau txais cov hlau nplaum tuag uas twb tau pib hydrate lossis ncuav mog qab zib. Qhia ntim, liner, thiab pallet wrapping.
5) Tus neeg yuav khoom RFQ daim ntawv teev npe rau cov hlau nplaum tuag
Thaum koj thov DBM, suav nrog:
Lub hom phiaj daim ntawv thov (cib / castable / ramming / gunning) thiab kev pabcuam kub
Yuav tsum tau tuagburned magnesite daim ntawv: hmoov / aggregate, thiab pes tsawg PSD ntau yam
Chemistry limits (MgO min; SiO₂/CaO/Fe₂O₃/Al₂O₃ max)
Lub hom phiaj ntawm lub cev rau qhov tuag hlawv magnesite: BD thiab AP ntau yam
Reactivity taw qhia yuav tsum tau rau deadburned magnesite (citric acid lub sij hawm los yog tus neeg muag khoom tus qauv qauv)
COA rau ntau + khaws cov qauv cai
Ntim spec (lub hnab hom, sab hauv liner, pallet qhwv, tiv thaiv ya raws)
Cov ntsiab lus tshuaj xyuas: leej twg xeem, qhov kev xeem tshwm sim, dab tsi tshwm sim ntawm kev tsis sib haum xeeb
Qhov kev qhuab qhia RFQ no txo cov kev xav tsis thoob thiab ua rau tuag hlawv magnesia kev yuav khoom rov ua dua.
6) Yooj yim tau txais kev tshuaj xyuas thiab kev taw qhia cia
Thaum tuaj txog, kho cov hlau nplaum uas tuag taus zoo li cov dej noo- cov khoom siv raw:
Xyuas cov hnab kom puas, caking, thiab txawv txav sov
Txheeb xyuas COA ntau tus lej sib tw khoom xa tuaj
Khaws ib qho piv txwv nyob rau hauv kaw tej yam kev mob rau deadburned magnesia
Khaws rau ntawm pallets, deb ntawm phab ntsa / pem teb, nrog cov av noo tswj
Yog tias koj tuaj yeem siv tsuas yog ib qho kev txhim kho: nruj reactivity verification thiab ntim cov cai rau dbm . Ob qhov kev hloov pauv no tiv thaiv feem ntau ntawm kev yuav khoom tsis ua haujlwm.
Deadburned magnesite tuaj yeem ntseeg tau thaum koj yuav nws zoo li cov khoom siv hluav taws xob- tsis yog khoom muag. Kev ua tiav COA (chemistry + BD / AP + PSD), qhov ntsuas qhov ua tau zoo, thiab cov cai lees paub meej yuav tig dbm kev yuav khoom mus rau hauv cov saw hlau ruaj khov. Thaum koj pab neeg ua raws li COA cov khoom, qhov kev cia siab ntawm kev xav, thiab kev tswj kev ntim khoom, cov hlau nplaum tuag tau ua tiav hauv kev sib xyaw, kev teeb tsa, thiab lub neej hauv ob sab phlu- raws nraim li cov neeg yuav khoom xav tau.
