High alumina castableyog lub workhorse ntawm industrial furnace siv. Nws nchuav, nws vibrates, thiab nws teem rau hauv ib tug ntom, load-cov kabmob hauv ob sab phlu - tsis muaj pob qij txha cib, tsis muaj kev txawj mason yuav tsum tau rau cov duab yooj yim. Tab sis "high alumina castable" tsis yog ib yam khoom. Qhov sib txawv ntawm 70% Al₂O₃ general-purpose castable thiab 90% Al₂O₃ corundum-based castable yog qhov tseem ceeb hauv kev ua haujlwm thiab tus nqi.
Phau ntawv qhia no muab cov lej tiag tiag rau koj hauv qib, piav qhia tias txhua qhov ntsuas ntawm daim ntawv teev lus txhais tau li cas, thiab taug kev los ntawm kev sib xyaw thiab kev teeb tsa cov kauj ruam uas txiav txim siab seb koj li cas kav ntev li 12 lub hlis lossis 3.
Dab tsi txhais "High Alumina" hauv Castable Refractories?
Hauv kev lag luam refractory, "high alumina" txhais tau tias Al₂O₃ cov ntsiab lus siab dua 45%. Qhov ntawd yog qhov pib. Rau castables siv nyob rau hauv loj industrial furnaces, cov tswv yim ntau yog 70-90% Al₂O₃ - qis dua 70% koj nyob rau hauv hluav taws av nplaum thaj chaw, saum toj no 90% koj nyob nraum tsiv mus rau corundum los yog tabular alumina castable, uas yog ib tug sib txawv tus nqi bracket.
Al₂O₃ ua dab tsi? Peb yam:
Load-bearing ntawm qhov kub thiab txias.Ntau dua alumina txhais tau hais tias ntau dua RUL (Refractoriness Hauv Load) kub - qhov taw tes ntawm lub cib pib deform nyob rau hauv siab. Ntawm 70% Al₂O₃, RUL T₀.₅ yog nyob ib ncig ntawm 1380 degree. Ntawm 90%, nws nce mus txog 1580 degree.
Tshuaj tiv thaiv.High-alumina theem tiv thaiv alkali nres thiab slag nkag tau zoo dua li cov av nplaum hluav taws. Rau cov ntawv thov xws li rotary kiln inlets lossis cement preheater linings, qhov no tseem ceeb tshaj qhov thermal conductivity.
Thermal shock kam rau ua.Paradoxically, ntshiab corundum castable (99% Al₂O₃) muaj qis thermal poob siab dua 70-80% qib vim corundum tsis muaj microcrack network uas absorbs kev ntxhov siab. Yog tias koj lub tshuab hluav taws xob ua haujlwm txhua hnub, 80% yuav ua tau zoo tshaj 90% hauv lub neej kev sib tw tiag tiag.
Qib Specs ntawm ib sab - 70%, 80%, 90% Al₂O₃ Cov Ntaub Ntawv
| Khoom | 70% Al₂O₃ | 80% Al₂O₃ | 90% Al₂O₃ |
|---|---|---|---|
| Al₂O₃ cov ntsiab lus (%) | 70–72 | 78–82 | 88–92 |
| SiO₂ cov ntsiab lus (%) | 20–25 | 12–18 | 5–8 |
| Qhov ntom ntom tom qab tua hluav taws (g / cm³) | 2.50–2.65 | 2.70–2.85 | 2.90–3.05 |
| Pom tseeb porosity (%) | 14–18 | 12–16 | 10–14 |
| CCS @ 110℃(MPa) | 60–80 | 80–110 | 100–140 |
| CCS @ 1000℃(MPa) | 75–100 | 90–130 | 120–160 |
| RUL T₀.₅ (degree) | 1350–1400 | 1450–1500 | 1550–1600 |
| PLC @ 1500℃× 3h (%) | -0.3 rau +0.3 | -0.3 rau +0.2 | -0.2 rau +0.2 |
| Max kev pab kub (degree) | 1550 | 1650 | 1750 |
| Thermal conductivity @ 1000℃(W / m·K) | 1.8–2.2 | 2.0–2.5 | 2.2–2.8 |
Source: Hauv tsev QC cov ntaub ntawv, 200-batch nruab nrab. ASTM C401 Kev faib tawm tus qauv.
Tus nqi ntsuas(kwv yees, FOB Qingdao hauv paus): 70%=1.0 ×|80%=1.4 ×|90%=2.0–2.5 ×
Rau feem ntau cov cement kiln thaub qab thiab kev kho cua sov rau cov ntawv thov, 80% Al₂O₃ hits qhov chaw qab zib ntawm tus nqi thiab kev ua haujlwm. Peb pom ntau tshaj qhov tshwj xeeb ntawm 90% thaum 80% yuav ua txoj haujlwm ntawm 40% cov khoom siv qis dua.
Yuav Ua Li Cas Nyeem Daim Ntawv Teev Npe Castable: CCS, RUL, PLC piav qhia
Cov ntaub ntawv tsis yog txhua tus ncaj ncees. Nov yog yuav ua li cas nyeem cov lej tseem ceeb:
CCS (Cold Crushing Strength).Cov neeg muag khoom feem ntau tshaj tawm CCS tom qab 110℃kom qhuav. Qhov ntawd yog qhov yooj yim kom ua tiav. Nug rau CCS tom qab 1000℃firing - nws qhia koj ntau npaum li cas muaj zog ciaj sia thawj lub tshav kub. Tus nqi qis dua 60 MPa ntawm 1000℃yog tus chij liab rau txhua yam hauv ob sab phlu.
RUL (Refractoriness Nyob rau hauv Load).Tus nqi T₀.₅ yog qhov kub thiab txias uas tus qauv tau compressed 0.5% hauv qab 0.2 MPa load. T₀.₅ ntawm 1450℃txhais tau tias: nyob rau hauv qhov cub qhov hnyav, qhov castable no pib nkag siab tshaj 1450 degree. Ib txwm muab piv RUL rau koj qhov kub ntawm qhov kub ntawm qhov cub - qhov sib txawv yog koj qhov kev nyab xeeb.
PLC (Kev hloov pauv mus tas li).Qhov no qhia rau koj yog hais tias lub castable shrinks los yog expands tom qab kev pab cuam ntawm kub kub. Tus nqi sab nraud ± 0.5% qhia qhov tsis txaus ntseeg. Ntau dhau shrinkage=sib koom qhib thiab hauv ob sab phlu. Tshaj nthuav dav=spalling thiab delamination.
Pom tseeb porosity.Qhov qis dua yog qhov zoo dua rau cov tshuaj tiv thaiv. Saum toj no 18% txhais tau hais tias lub hauv ob sab phlu yog txaus rau molten slag infiltrate lub microstructure lub sij hawm.
Ib yam uas ntau tus neeg yuav tsis nco: tus nqi ntxiv dej ntawm TDS tau muab raws li feem pua ntawm qhov hnyav qhuav (feem ntau 5-8%). Ntxiv dej ntxiv "rau flowability" heev txiav CCS - peb tau pom cov ntaub ntawv ua tsis tiav ntawm 30-40% ntawm cov qhab nia CCS tsuas yog vim tus neeg cog lus ntxiv 2% dej ntxiv.
Kev sib xyaw thiab kev teeb tsa - dej sib piv, kev vibration, kho
Sib tov
Siv lub tshuab ua kom yuam kev (yias lossis nruas). Free-fall qhob mixers muab cov txiaj ntsig tsis sib xws.
Dej-rau-hmoov piv los ntawm qib:
| Qib | Kev vibration casting | Free-flow / self-leveling |
|---|---|---|
| 70% Al₂O₃ | 5.5–6.5% | N/A (qib tuab) |
| 80% Al₂O₃ | 5.0–6.0% | 6.5-7.5% (LCC variant) |
| 90% Al₂O₃ | 4.5–5.5% | 6.0-7.0% (tus kheej ntws) |
Sib tov rau 3-5 feeb kom txog thaum homogeneous. Tsis txhob ntxiv dej ntxiv los txhim kho kev ntws - siv cov yas yas yog tias koj xav tau kev ua haujlwm zoo dua.
Formwork thiab vibration
Cam khwb cia hauv nqa ntawm 300-400mm siab tshaj plaws. Vibrate txhua nqa rau 30-60 vib nas this ntawm 50 Hz. Tshaj-vibration ua rau aggregate segregation. Kos: castable yuav tsum ntws los ntawm kev txhawb nqa thiab sau cov fab ntawm cov ces kaum yam tsis muaj voids.
Curing thiab Dry-out
Tom qab casting, kho rau yam tsawg kawg nkaus 24 teev ntawm 15-25℃ua ntej ib daim ntawv thov cua sov. Tom qab ntawd ua raws li qhov nkhaus qhuav tawm:
| Theem | Qhov kub thiab txias | Cua sov tus nqi | Tuav |
|---|---|---|---|
| 1 | Ambient → 110 degree | 15℃/ teev | 8 hrs |
| 2 | 110℃→ 350 degree | 20℃/ teev | 4 hrs |
| 3 | 350℃→ 600 degree | 25℃/ teev | 2 hrs |
| 4 | 600℃→ Ua haujlwm | 30-50℃/ teev | Raws li txheej txheem |
Lub 110℃tuav yog tsis-negotiable - qhov no yog qhov twg chemically khi dej tawm. Rushing dhau los nws ua rau lub zog siab buildup thiab explosive spalling.
Feem ntau ua rau tsis ua hauj lwm thiab yuav ua li cas zam lawv
1. Cov dej ntau dhau thaum sib tov.Twb tau hais lawm - feem ntau ua rau ua tsis tiav ntxov. Ua raws li TDS dej piv. Siv lub superplasticizer yog tias tus neeg cog lus yws txog kev ua haujlwm.
2. Lub sijhawm kho tsis txaus ua ntej cua sov.24 teev yam tsawg kawg nkaus ntawm ambient kub. Hauv cov huab cua txias (hauv qab 10 degree), txuas mus rau 48 teev.
3. Thermal shock los ntawm kev kub ceev thawj zaug.Qhov nkhaus qhuav tawm tsis yog xaiv tau. Lub qhov cub 4-teev coj mus rau 1000℃hauv 2 teev yuav tawg. Peb tau hloov cov ntaub ntawv uas ua tsis tiav rau Hnub 1 vim tias tus saib xyuas qhov chaw "xav tau lub cub tawg hauv online."
4. Qib tsis raug rau daim ntawv thov.70% Al₂O₃ hauv thaj tsam ladle slag. 80% Al₂O₃ qhov twg alkali nres hnyav. Cov kev hloov pauv no tshwm sim. Paub koj txoj haujlwm hauv ob sab ua ntej xaj.
5. Cov kab mob sib kis lossis cov cement.High-alumina castable yog rhiab heev rau calcium silicate paug los ntawm qib qis refractory cement. Nco ntsoov qhia qhov chaw cement thiab nug rau COA ua ntej tsim khoom.
Sourcing Checklist - Yam Yuav Tsum Tau Ua Ua ntej koj xaj
Ua ntej muab ib qho kev txiav txim ntau:
TDS nrog CCS tus nqi ntawmOb leeg 110℃thiab 1000 degree(tsis yog 110℃xwb)
RUL T₀.₅ cov ntaub ntawv (kuaj rau ASTM C113 lossis ISO 1893)
PLC cov ntaub ntawv ntawm koj qhov kev pabcuam kub + 50 degree
Batch COA los ntawm tib qhov kev khiav haujlwm (Al₂O₃ %, Fe₂O₃ %, grain loj faib)
Dej-rau-hmoov piv tau lees paub rau koj hom ntawv thov (kev vibration vs. self-flow)
ISO 9001: 2015 daim ntawv pov thawj nrog hnub siv tau
Qauv muaj ua ntej kev txiav txim ntau (50-100 kg)
Peb sim txhua batch ntau lawm rau cov saum toj no tsis. QC cov ntaub ntawv khaws cia rau 36 lub hlis - taug qab los ntawm ntau tus lej ntawm lub hnab.
Cov lus nug nquag
High alumina castable refractory siv rau dab tsi?
High alumina castable refractory yog siv rau hauv ob sab phlu industrial furnaces thiab kilns khiav hauj lwm ntawm 1400℃thiab 1750 degree. Cov ntawv thov feem ntau suav nrog cov cement rotary kiln inlets thiab qhov hluav taws xob, steel ladle thaub qab hauv ob sab phlu, kho cua sov hauv ob sab phlu, tawg furnaces hauv petrochemical cov nroj tsuag, thiab hluav taws xob arc rauv ru tsev kho. Qib 70% yog siv rau kev thaub qab thiab cov txheej txheem txheej txheem; 80-90% qib yog siv rau kev sib cuag ntawm lub ntsej muag kub qhov twg slag kuj thiab load-bearing zog yuav tsum tau.
Dab tsi yog qhov txawv ntawm siab alumina castable thiab qis cement castable (LCC)?
High alumina castable yog hais txog Al₂O₃ cov ntsiab lus (Ntau dua lossis sib npaug li 70%).Tsawg cement castable(LCC) yog hais txog calcium aluminate cement cov ntsiab lus (tsawg dua lossis sib npaug li 4%). Ob qhov kev faib tawm no tuaj yeem sib tshooj - qis cement castable kuj tuaj yeem yog alumina siab castable. LCC muaj CaO cov ntsiab lus qis, uas txo cov slag infiltration thiab txhim kho qhov kub thiab txias. Rau qhov xav tau daim ntawv thov saum toj 1500 degree, peb pom zoo kom muab ob qho tib si: siab alumina + qis cement formulation.
Lub siab alumina castable ntev npaum li cas los kho ua ntej tua?
Qhov tsawg kawg nkaus ntawm 24 teev ntawm qhov kub thiab txias (15-25 degree) yog xav tau ua ntej lub voj voog qhuav-tawm cua sov pib. Thawj theem tseem ceeb yog cua sov qeeb txog 110℃nrog 8-teev tuav kom tshem tawm cov dej dawb. Hla los yog shortening no tuav yog feem ntau ua rau tawg spalling nyob rau hauv cov ntaub ntawv tshiab.
Lub siab alumina castable puas tuaj yeem kho yam tsis muaj kev hloov pauv tag nrho?
Yog, rau kev puas tsuaj hauv cheeb tsam txog li 30% ntawm thaj tsam hauv ob sab phlu. Siv ib rab phom castable ntawm tib qib Al₂O₃ rau kub patching. Rau qhov ua tsis tau zoo lossis kev puas tsuaj loj dua, kev hloov pauv tag nrho yog qhov txiaj ntsig zoo dua li kev rov kho thaj chaw. Peb muab ob qho tib si vibration-cam khwb cia thiab phom-qib formulations ntawm peb lub siab alumina castable.
