Refractory prefabricated qhov chaw muaj qhov zoo ntawm qhov yooj yim ntawm kev tsim kho, ceev thiab ntev kev pab cuam lub neej, thiab lawv yog ntau thiab ntau lug siv nyob rau hauv high-temperature industrial furnaces.
Nws cov txheej txheem ntau lawm yog qhov yooj yim, raws li cov txheej txheem ntawm batching, nplawm, molding, ziab thiab lwm yam txheej txheem. Txawm li cas los xij, feem ntau muaj qee qhov teeb meem hauv kev tsim khoom. Daim ntawv no tsuas yog tham txog cov teeb meem tshwm sim hauv kev tsim khoom thiab yuav ua li cas nrog lawv.
1. Pulverization ntawm impurities hauv bauxite clinker
Bauxite clinker yog ib qho ntawm cov khoom siv refractory feem ntau siv rau cov khoom siv refractory, thiab nws qhov zoo muaj qhov cuam tshuam zoo rau kev ua haujlwm ntawm cov khoom siv refractory. Bauxite clinker, uas yog, bauxite clinker, yog ua los ntawm bauxite los ntawm kub kub calcination, thiab nws cov ntsiab lus Al2O3 yuav tsum siab tshaj 50 feem pua. Cov ntsiab lus impurity nyob rau hauv cov khoom yuav tsum tsis txhob ntau tshaj 2 feem pua, thiab txawv teb chaws inclusions xws li limestone, loess, siab calcium thiab high hlau yuav tsum tsis txhob tov. Vim lub geological tis yam ntxwv ntawm bauxite raw ore, nws yog feem ntau txuam nrog limestone, loess, thiab lwm yam. Yog hais tias kev xaiv tom qab calcination tsis txaus, limestone thiab lwm yam impurities yuav muab tov rau hauv bauxite clinker. Nyob rau hauv cov txheej txheem ntawm ziab, firing los yog siv, vim lub pulverization ntawm limestone, lub zos qhov chaw tsis xws luag tshwm sim nyob rau hauv cov khoom, uas tsis tsuas yog cuam tshuam rau cov tsos zoo ntawm cov khoom, tab sis kuj muaj feem xyuam rau lub internal zoo ntawm cov khoom. Yog li ntawd, ua ntej siv bauxite clinker, nws yog ib qho tsim nyog yuav tau ua qhov kev tshuaj xyuas ntawm pulverization tus nqi. Tom qab ziab ntawm qhov ntsuas kub, tom qab dhau los ntawm 3 hli sieve, qhov hnyav ntawm cov khoom ntawm lub sieve yog hu ua M2, thiab tus nqi pulverization tuaj yeem qhia tau tias:
Powder tus nqi (%)=(M1-M2)/M1 × 100 feem pua
Nws raug nquahu tias tus nqi pulverization yuav tsum tsis pub tshaj 0.20 feem pua . Yog tias ntsuas pulverization tus nqi siab dhau lawm, txhawm rau ua kom cov khoom zoo, cov khoom siv raw yuav tsum tau pretreated, uas tuaj yeem impregnated nrog dej, qhuav thiab tshuaj xyuas ua ntej siv.
2. Powder ntawm xim av corundum
Ntawm cov tsis zoo li cov refractories, corundum yog siv los ua refractory aggregate thiab hmoov, uas yog siv ntau thiab ntau, thiab tau ua tiav cov txiaj ntsig zoo kawg li. Corundum feem ntau yog ua los ntawm kev lag luam alumina lossis bauxite tom qab sintering lossis electrofusion, suav nrog dawb corundum, subwhite corundum, tabular corundum, siab alumina corundum, xim av corundum, thiab lwm yam. hlau filings ua cov ntaub ntawv tseem ceeb. Cov txheej txheem smelting yog muab faib ua ob hom: plhaub rauv thiab dumping rauv. Lub crystallization degree ntawm ntau qhov sib txawv ntawm cov khoom tsim los ntawm lub plhaub rauv yog qhov sib txawv heev, thiab kev faib cov hlau yog dav dua nyob rau tib lub sijhawm. Cov xim av corundum uas tsim los ntawm lub qhov cub tawg muaj qhov zoo sib xws thiab lub cev zoo, tab sis vim yog qhov zoo sib xws, qhov kev faib tawm tsawg dua, thiab qhov kev qhia dav dav yuav ua rau me ntsis zuj zus. Raws li kev xyaum ua ntau lawm, cov xim av fused alumina uas ua los ntawm lub cub tawg yog feem ntau yuav pulverized tshaj qhov uas ua los ntawm lub qhov cub tawg. Yog hais tias xim av corundum nrog siab pulverization tus nqi yog siv los tsim prefabricated qhov chaw, tom qab kub kub firing, pulverization thiab cracking tshwm sim nyob rau hauv lub zos ntawm qhov chaw ntawm cov khoom, uas tsis tsuas cuam tshuam rau qhov zoo ntawm cov khoom, tab sis kuj zoo heev txo qhov firing pass tus nqi thiab nce tus nqi tsim khoom. Vim hais tias kev siv cov xim av corundum nrog siab pulverization tus nqi muaj teeb meem loj, nws yog ib qhov tsim nyog los ntsuam xyuas tus nqi pulverization.
Tam sim no, tsis muaj txoj kev tshawb nrhiav thiab tus qauv rau pulverization tus nqi. Cov txheej txheem siv nyob rau hauv daim ntawv no yog raws li nram no:
Kev xeem zoo: uas yog, rau txhua pawg ntawm cov xim av corundum, cov khoom yog prefabricated raws li ib qho qauv. Tom qab ziab, nws raug rho tawm haujlwm ntawm qhov kub qis ntawm 600 ° C lossis 1 000 degree C kom pom tias nws tawg, thiaj li txiav txim siab seb cov pob zeb xim av corundum puas yog hmoov lossis tsis. hloov.
Kev kuaj xyuas kom muaj nuj nqis: Siv ib qho piv txwv me me nrog qhov hnyav ntawm M3, feem ntau nrog qhov loj me ntawm 3-1 hli, boil hauv dej rau 60 min hauv lub tshuab hluav taws xob siab (lossis kho nws hauv qhov cub hluav taws xob ntawm {{ 3}} degree × 1 h), thiab saib nws cov khoom tom qab ziab. Qhov kev hloov ntawm cov xim thiab qhov loj me, tom qab dhau los ntawm 1 hli npo, qhov hnyav ntawm cov khoom ntawm lub vijtsam raug kaw raws li M4, thiab tus nqi pulverization tuaj yeem qhia tau tias:
Powder rate (%)=(M3-M4)/M3 × 100 feem pua
Cov pulverization tus nqi kuaj tsis ntau tshaj 0.10 feem pua raws li tsim nyog. Rau cov khoom sib txawv refractory, tus qauv ntawm pulverization tus nqi tswj yuav txawv.
3. Rising stratification ntawm magnesium-aluminium preforms uas muaj silicon micropowder
Nyob rau hauv cov txheej txheem ntawm magnesium-aluminium preforms uas muaj silicon micropowder, qhov tsim nto feem ntau nce, uas ua rau cov phenomenon ntawm cov khoom delamination, uas yuav cuam tshuam rau lub neej kev pab cuam thiab yield ntawm refractory khoom. Muaj ob hom SiO2 micropowder: ib qho yog ua los ntawm high-purity silica, thiab lwm yam yog ib tug by-product ntawm zus tau tej cov hlau silicon los yog ferrosilicon. Silicon micropowder feem ntau yog siv rau hauv cov ntaub ntawv refractory hais txog tom kawg. Nws yog hollow spherical, active, non-agglomerated, thiab muaj zoo filling zog. Nws muaj pozzolanic cov tshuaj tiv thaiv ntawm chav tsev kub thiab cov ntaub ntawv mullite nrog Al2O3 ntawm qhov kub thiab txias, uas yog qhov zoo rau lub zog ntawm castable. txhim kho. Tab sis nws yuav tsum muaj lub cev ruaj khov thiab tshuaj lom neeg, txwv tsis pub nws yuav cuam tshuam rau kev ua haujlwm ntawm cov khoom. Hauv kev tsim cov txheej txheem ntawm refractory preforms, feem ntau muaj kev hloov pauv hauv cov khoom molding ntawm cov khoom vim yog batch hloov ntawm silicon micropowder hauv cov ntaub ntawv raw. Ntawm lawv, qhov kev ua tau zoo tshaj plaws yog qhov nce thiab stratification ntawm cov khoom tsim.
Txoj kev los daws qhov teeb meem ntawm kev nce stratification yog: thawj zaug, sieve siv silicon micropowder kom homogenize nws muaj pes tsawg leeg; thib ob, nyob rau hauv tus txheej txheem ntawm kev sib tov, nce tus nqi ntawm retarder ntxiv, tsim nyog nce tus nqi ntawm cov dej ntxiv, thiab nyob rau tib lub sij hawm kom zoo. Nthuav lub sijhawm ntub dej, thiab tom qab ntawd cov duab; Thaum kawg, tsim nyog txo qhov kub ntawm cov khoom, uas tuaj yeem daws qhov teeb meem.
4. Flashing ntawm corundum spinel preforms uas muaj txhuas micropowder
Hauv kev tsim cov refractories tsis zoo, - Al2O3 micropowder kuj yog ib qho ntawm cov khoom siv refractory. - Al2O3 ultrafine hmoov yog tsim los ntawm calcining muaj alumina. Nws yog tus cwj pwm los ntawm kev sib cais zoo, cov khoom me me, yooj yim sintering ntawm qhov kub thiab txias thiab cov nyhuv me me. Corundum spinel preforms uas muaj cov hmoov txhuas feem ntau tshwm sim hauv kev tsim khoom. Thaum lub sij hawm kho tom qab molding, ib txheej ntawm milky dawb kua thiab honeycomb pits tshwm nyob rau hauv molding nto, thiab npuas ntws los ntawm lub pits. Tom qab tshem tawm cov kua ntawm lub molding nto, nws pom tau hais tias lub molding nto yog tsim los ntawm cov hmoov, qhov tshwm sim no yog hu ua "dej nyab" tshwm sim, thiab lub thickness ntawm cov hmoov txheej ntawm lub molding nto nws txawv nrog lub degree ntawm flashing.
Qhov teeb meem dej nyab yog qhov pom tseeb dua nyob rau lub caij ntuj no, uas ua rau muaj kev phom sij loj rau qhov zoo ntawm cov khoom siv refractory prefabricated, ua rau cov qauv tsis sib xws, tsis muaj zog, txo thermal shock thiab yaig tsis kam, thiab kev pab cuam lub neej tsawg. Tom qab ntau qhov kev tshawb nrhiav thiab kev tshuaj xyuas, nws pom tias cov dej flashing muaj qee qhov kev sib raug zoo nrog cov ntsiab lus ntawm cov hlau oxides K2O thiab Na2O hauv cov khoom siv raw cov hmoov txhuas. Thaum cov ntsiab lus saum toj no 0.2 feem pua, cov khoom prefabricated yog tsim nrog cov khoom sib xyaw nrog cov hmoov txhuas no, thiab tsis muaj qhov tshwm sim tshwm sim; thaum cov ntsiab lus qis dua 0.1 feem pua, cov khoom sib xyaw yog siv rau kev tsim cov khoom ua ntej. Kev nyab xeeb tshwm sim, txawm tias hnyav heev.
Rau cov teeb meem dej nyab, cov hauv qab no tuaj yeem siv los daws lossis daws tau. ① Raws li qhov ib txwm muaj cov dej ntxiv, tsim nyog txo qhov feem ntawm {{0}}.1 ~ 0.3 feem pua ; ② Kho qhov sib ntxiv ntawm retarder thiab accelerator, tsim nyog nce qhov feem ntawm coagulant, thiab txo qhov feem ntawm retarder; ③ Txhim kho molding kom zoo Tom qab qhov kub thiab txias; ④ Thaum sib tov, ntxiv me me ntawm fused magnesia hmoov zoo, thiab cov nyiaj ntxiv yuav tsum tsis pub tshaj 0.5 feem pua.
5. Kev kho kub kub ntawm prefabricated prefabricated hooks
Kev kho kub kub ntawm prefabricated qhov chaw nrog embedded hooks kuj yog ib qho ntawm cov teeb meem feem ntau ntsib nyob rau hauv zus tau tej cov refractory prefabricated qhov chaw. Qhov kub thiab txias kev kho mob tau hais ntawm no yog hais txog 1100 degree lossis siab dua. Yog li ntawd, nws tsis tuaj yeem raug rho tawm haujlwm ncaj qha li niaj zaus, tab sis qee qhov kev tiv thaiv yuav tsum tau ua kom tsis txhob raug hluav taws kub thiab oxidation ntawm cov hlau nuv.
Txog rau qhov kawg no, thawj zaug, cov hlau tuav nrog tib lub thickness raws li cov hooks tau siv rau qhov kev xeem, thiab peb txheej txheej txheem tau sim: faus carbon; txheej steel bar nrog anti-oxidation xim; wrapping steel bar nrog refractory paj rwb, thiab tom qab ntawd siv cov castable raws li cov txheej txheem oxidation sab nraud.
Kev tua hluav taws kub hauv qhov cub kub, qhov kev sim tau tshwm sim: cov rebars raug rho tawm los ntawm cov pa roj carbon monoxide tsis zoo; cov rebars coated nrog anti-oxidation xim yog cov feem ntau tawg; seem rebar qhov twg cov castable yog siv los tiv thaiv oxidation txheej sab nraud, vim hais tias cov castable tshwm thaum lub sij hawm firing txheej txheem. Ib nrab oxidation tshwm sim vim microcracks, thiab lub thickness ntawm oxide txheej yog 1-2 hli.
Nws tuaj yeem pom tias kev kho cov pa roj carbon monoxide yog qhov kev xaiv zoo tshaj plaws. Thaum lub sij hawm kho cov pa roj carbon monoxide, nws yuav tsum tau muab sau tseg tias kev kho ib nrab lossis tag nrho cov pa roj carbon burial tuaj yeem ua tau raws li cov yam ntxwv ntawm cov khoom prefabricated.
