1. Kev sib xyaw thiab Hydration Chemistry ntawm Calcium Aluminate Cement
1.1 Cov theem pib thiab cov khoom siv yooj yim
(Calcium Aluminate Qhob)
Calcium aluminate pob zeb (CAC) yog ib lub tsev tsim khoom tshwj xeeb raws li calcium aluminate cement (CAC), uas txawv ntawm qhov nruab nrab ntawm Portland cement (OPC) nyob rau hauv ob qho tib si muaj pes tsawg leeg thiab efficiency.
Thawj theem khi hauv CAC yog monocalcium aluminate (CaO · Al ₂ O Six or CA), feem ntau suav nrog 40– 60% ntawm clinker, ua ke nrog ntau lwm theem xws li dodecacalcium hepta-aluminate (C ₁₂ A ₇), calcium dialuminate (CA ob), thiab me me ntawm tetracalcium trialuminate sulfate (C ₄ AS).
Cov theem no yog tsim los ntawm kev sib xyaw ua ke ntawm high-purity bauxite (aluminium-nplua nuj ore) thiab sedimentary pob zeb nyob rau hauv hluav taws xob arc los yog rotary kilns ntawm kub nruab nrab ntawm 1300 ° C thiab 1600 ° C, coj mus rau ib tug clinker uas yog li ntawd av txoj cai mus rau hauv ib tug zoo hmoov.
Kev siv cov bauxite ua kom lub teeb hnyav aluminium oxide (Al two O ₃) web cov ntsiab lus– feem ntau nruab nrab ntawm 35% thiab 80%– uas yog ib qho tseem ceeb rau cov khoom refractory thiab tshuaj lom neeg cov khoom nyob hauv tsev.
Tsis zoo li OPC, uas suav nrog calcium silicate hydrates (C-S-H) rau toughness nce qib, CAC tau txais nws cov neeg kho tshuab thaj chaw lossis cov khoom lag luam nrog cov dej ntawm calcium aluminate theem, tsim kom muaj kev sib sau sib txawv ntawm hydrates nrog kev ua haujlwm zoo tshaj plaws hauv qhov chaw nruj heev.
1.2 Cov Khoom Siv Dej Dej thiab Kev Txhim Kho Lub Zog
Lub hydration ntawm calcium aluminate cement yog ib qho nyuaj, cov txheej txheem kub-rhiab heev uas ua rau tsim cov metastable thiab ruaj khov hydrates nrog lub sijhawm.
Ntawm qhov kub thiab txias tau teev tseg hauv qab no 20 ° C, CA moisturizes los tsim CAH ₁₀ (calcium aluminate decahydrate) thiab C₂ AH ₈ (Dicalcium aluminate octahydrate), uas yog cov theem metastable uas muaj zog thaum ntxov– feem ntau ua tiav 50 MPa hauv 1 hnub.
Txawm li cas los xij, ntawm qhov kub siab tshaj 25– 30 ° C, cov metastable hydrates tau hloov pauv mus rau theem thermodynamically ruaj ntseg, C SIX AH SIX (hydrogarnet), thiab amorphous lub teeb yuag aluminium hydroxide (AW FIVE), ib tug txheej txheem hu ua conversion.
Qhov kev hloov pauv no txo qis qhov muaj zog ntawm cov theem hydrated, raising porosity thiab tejzaum nws deteriorating lub pob zeb yog hais tias tsis raug kho thoob plaws hauv kev kho thiab daws.
Tus nqi thiab theem ntawm kev hloov pauv yog cuam tshuam los ntawm dej-rau-cement piv, kho kub, thiab muaj cov khoom xyaw xws li silica fume lossis microsilica, uas tuaj yeem txo cov tawv nqaij poob los ntawm kev ua kom cov pore moj khaum thiab tshaj tawm cov tshuaj tiv thaiv theem nrab.
Txawm tias muaj kev hem thawj ntawm kev hloov dua siab tshiab, Lub zog ceev tau nce thiab ua kom muaj peev xwm ua tau sai heev ua rau CAC zoo tagnrho rau cov khoom siv ua ntej thiab kho qhov xwm txheej kub ntxhov hauv kev lag luam..
( Calcium Aluminate Qhob)
2. Lub Cev thiab Mechanical Residences nyob rau hauv cov teeb meem hnyav heev
2.1 High-temperature Performance thiab Refractoriness
Ntawm ib qho ntawm feem ntau txhais cov yam ntxwv ntawm calcium aluminate pob zeb yog nws lub peev xwm los tuav tiv thaiv huab cua kub, ua nws yog ib qho kev xaiv zoo tshaj plaws rau refractory cellular linings nyob rau hauv industrial heaters, qhov cub, thiab burners.
Thaum cua sov, CAC lees paub qhov sau ntawm lub cev qhuav dej thiab cov lus teb sintering: hydrates tawg hauv nruab nrab 100 ° C thiab 300 ° C, ua raws li kev tsim cov theem nrab crystalline xws li CA ₂ thiab melilite (gehlenite) saum toj no 1000 ° C.
Nyob rau theem kub tshaj 1300 ° C, Cov ntaub ntawv tuab ceramic ua los ntawm cov kua-theem sintering, ua rau muaj kev ruaj ntseg zoo heev thiab kev ruaj ntseg ntim.
Qhov kev coj cwj pwm no sib txawv heev nrog OPC-raws li pob zeb, uas feem ntau spalls los yog degenerates saum toj no 300 ° C vim yog qhov hnyav hnyav hnyav hnyav thiab tawg ntawm C-S-H theem.
CAC-raws li cov pob zeb muaj peev xwm tswj tau qhov kev pab cuam qhov kub thiab txias mus txog rau 1400 ° C, nyob ntawm qhov sib xyaw ua ke thiab kev daws teeb meem, thiab feem ntau yog siv nyob rau hauv kev sib xyaw nrog refractory aggregates zoo li calcined bauxite, chamotte, los yog mullite los txhim kho thermal shock kuj.
2.2 Resistance rau Chemical Assault thiab Corrosion
Calcium aluminate pob zeb ua pov thawj zoo kawg li tiv thaiv rau ntau yam ntawm cov tshuaj lom neeg, tshwj xeeb acidic thiab sulfate-nplua nuj tej yam kev mob uas OPC yuav sai sai deteriorate.
Cov hydrated aluminate theem muaj ntau ruaj khov nyob rau hauv qhov chaw qis-pH, tso cai rau CAC tiv thaiv acid tawm tsam los ntawm cov peev txheej xws li sulfuric, hydrochloric, thiab organic acids– ib txwm nyob hauv cov chaw kho dej khib nyiab, chemical tuav cov chaw, thiab kev ua haujlwm mining.
Nws kuj tseem tiv thaiv kev tiv thaiv sulfate, ib qho tseem ceeb ua rau OPC pob zeb degeneration nyob rau hauv cov av thiab marine ib puag ncig, vim tsis muaj calcium hydroxide (Portlanders) thiab ettringite-forming theem.
Ntxiv thiab, CAC qhia tau hais tias tsis tshua muaj solubility hauv dej ntsev thiab tiv thaiv chloride ion nkag mus, txo qhov txaus ntshai ntawm kev txhawb nqa tsis zoo nyob rau hauv cov dej tsis sib haum xeeb.
Cov vaj tsev nyob lossis kev lag luam no ua rau nws tsim nyog rau cov kab hauv cov khoom siv biogas digesters, pulp thiab ntawv sector cia tanks, thiab flue gas desulfurization cov cuab yeej uas muaj tshuaj lom neeg thiab thermal kev ntxhov siab thiab kev ntxhov siab.
3. Microstructure thiab Resilience Attributes
3.1 Pore Framework thiab Leaks hauv Cov Qauv
Lub durability ntawm calcium aluminate pob zeb yog sib txuas nrog nws cov microstructure, tshwj xeeb tshaj yog nws pore dimension ncig thiab kev sib txuas.
Tshiab moisturized CAC qhia pom lub qhov hws zoo dua piv rau OPC, nrog gel pores thiab capillary pores pab txo permeability thiab boosted tsis kam mus hostile ion ingress.
Txawm li cas los xij, raws li kev hloov dua siab tshiab, lub coarsening ntawm pore lub moj khaum vim qhov ntom ntawm C SIX AH rau tuaj yeem ua rau kom cov pa tawm hauv cov qauv yog tias cov pob zeb tsis tsim nyog kho lossis ruaj ntseg.
Kev txhim kho ntawm cov khoom siv aluminosilicate teb, xws li ya tshauv lossis metakaolin, tuaj yeem txhim kho kev ua haujlwm ntev ntev los ntawm kev siv cov txiv qaub dawb thiab tsim cov calcium aluminosilicate hydrate. (C-A-S-H) theem uas kho cov microstructure.
Kho kho kom raug– tshwj xeeb ntub curing ntawm kev tswj kub– yog ib qho tseem ceeb kom ncua kev hloov dua siab tshiab thiab tso cai rau kev nce qib ntawm qhov ntom ntom, impenetrable matrix.
3.2 Thermal Shock thiab Spalling Resistance
Thermal shock resistance yog ib qho tseem ceeb ntawm kev txheeb xyuas cov ntaub ntawv siv nyob rau hauv cyclic tsev cua sov thiab cua txias cua..
Calcium aluminate pob zeb, tshwj xeeb tshaj yog thaum formulated nrog tsawg-cement cov ntaub ntawv thiab siab refractory tsub kom muaj nuj nqis, Cov khoom pov thawj zoo heev rau thermal spalling vim nws cov coefficient tsawg ntawm thermal kev loj hlob thiab siab thermal conductivity txog ntau yam refractory concretes..
Lub hav zoov ntawm microcracks thiab interconnected porosity tso cai rau kev ntxhov siab thiab ntxhov siab vim kev lom zem thoob plaws hauv kev hloov kho kub ceev., tiv thaiv kev puas tsuaj tawg.
Fiber txhawb– siv cov hlau, polypropylene, los yog lava fibers– ntxiv txhim kho lub zog thiab tawg kuj, tshwj xeeb tshaj yog nyob rau hauv lub preliminary heat-up theem ntawm kev lag luam cellular linings.
Cov yam ntxwv no ua rau lub neej ntev ntev hauv kev siv xws li ladle cellular linings hauv steelmaking, rotary kilns hauv kev tsim ua vaj tse, thiab petrochemical crackers.
4. Cov ntawv thov kev lag luam thiab yav tom ntej Advancement Trends
4.1 Trick Industries thiab cov qauv siv
Calcium aluminate qhob yog qhov tseem ceeb hauv kev lag luam uas cov pob zeb tsoos luv luv vim yog qhov tshwm sim ntawm thermal lossis tshuaj lom neeg ncaj qha..
Hauv kev lag luam steel thiab foundry, Nws yog siv rau monolithic linings hauv ladles, hauv chav kawm, thiab saturating pits, qhov twg nws tuav tawm tsam liquified steel hu thiab thermal caij tsheb kauj vab.
Nyob rau hauv khib nyiab incineration nroj tsuag, CAC-based refractory castables tiv thaiv lub hauv paus cua sov boiler phab ntsa los ntawm acidic flue gases thiab ntxhib ya tshauv ntawm qhov kub thiab txias.
Cov dej khib nyiab hauv zej zog siv CAC rau manholes, chaw nres tsheb twj tso kua mis, thiab cov kav dej phwj tuaj raug rau biogenic sulfuric acid, Qhov kev ncua ntev ntawm lub neej sib txawv rau OPC.
Nws kuj tseem siv rau hauv kev kho ceev ceev rau kev loj, choj, thiab tshav dav hlau txoj kev, qhov twg nws qhov xwm txheej ceev tso cai rau tib hnub rov qhib rau lub vev xaib.
4.2 Sustainability thiab Advanced Formulations
Tsis hais txog ntawm nws qhov kev ua tau zoo, Kev tsim cov calcium aluminate pob zeb yog lub zog siv zog thiab muaj cov pa roj carbon ntau dua li OPC vim qhov kub-kub clinkering..
Kev tshawb fawb tsis tu ncua tsom rau kev txo qis ib puag ncig los ntawm kev hloov ib nrab nrog kev lag luam spin-offs, xws li lub teeb yuag aluminium dross lossis slag, thiab txhim khu kev ua tau zoo ntawm kiln.
Cov kev daws teeb meem tshiab suav nrog nanomaterials, xws li nano-alumina lossis carbon nanotubes, lub hom phiaj los txhim kho lub zog thaum ntxov, txo cov kev hloov pauv cuam tshuam txog kev puas tsuaj, thiab txuas ntxiv kev daws qhov kub thiab txias.
Ntxiv rau, txoj kev loj hlob ntawm low-cement thiab ultra-low-cement refractory castables (ULCCs) txhim kho thickness, lub zog, thiab kev ua neej ntev los ntawm kev txo qhov ntau ntawm reactive matrix thaum ua kom zoo tshaj plaws ntawm kev sib txuas sib txuas.
Raws li cov txheej txheem lag luam xav tau ua ntej cov khoom siv ruaj khov ntxiv, calcium aluminate pob zeb txuas ntxiv mus ua lub hauv paus ntawm kev ua haujlwm siab, kev tsim kho ruaj khov nyob rau hauv ib qho ntawm cov teeb meem nyuaj tshaj plaws.
Hauv recap, calcium aluminate pob zeb ua ke ua kom muaj zog ruaj khov, kub stability, thiab zoo heev tshuaj tiv thaiv, ua nws yog ib yam khoom tseem ceeb rau lub moj khaum raws li huab cua kub thiab corrosive tej yam kev mob.
Nws tshwj xeeb hydration chemistry thiab microstructural nce qib yuav tsum tau ceev faj tuav thiab style, txawm li cas los xij thaum tsim nyog thov, nws muab kev ruaj khov thiab kev ruaj ntseg tsis sib xws hauv kev lag luam thoob ntiaj teb.
5. Distributor
Cabr-Concrete yog ib tug neeg muag khoom nyob rau hauv TRUNNANO ntawm Calcium Aluminate Cement nrog tshaj 12 xyoo dhau los hauv nano-tsim hluav taws xob txuag thiab kev tsim kho nanotechnology. Nws lees txais kev them nyiaj ntawm Credit Card, T/T, West Union thiab Paypal. TRUNNANO yuav xa cov khoom rau cov neeg siv khoom txawv teb chaws los ntawm FedEx, DHL, los ntawm huab cua, los yog hiav txwv. Yog koj tab tom nrhiav aluminate cement, thov koj xav tiv tauj peb thiab xa cov lus nug. (
Cim npe: calcium aluminate,calcium aluminate,aluminate cement
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