Amorphous refractory castable thiab castable prefabricated qhov chaw tau dav siv los ntawm ntau thiab ntau qhov kub thiab txias industrial kilns vim lawv qhov zoo ntawm kev tsim kho yooj yim, ceev thiab siv zog tsawg.
Txawm li cas los xij, ntau tus neeg siv kev lag luam pom tias cov hluav taws kub nyhiab castable lossis prefabricated qhov chaw muaj nyob hauv cov txheej txheem khaws cia lossis kev saib xyuas ntawm qee qhov tshwm sim txawv txav, xws li hmoov, cov plaub hau dawb ntev thiab lwm yam tshwm sim.
Qhov tseeb, cov no yog cov khoom alumina cement hydration siab nyob rau hauv refractory castable thiab atmospheric acid gas contact los ntawm. Tom qab lub prefabricated castable yog tsim, nrog cov evaporation ntawm cov dej nyob rau hauv lub castable, ntsev cov khoom tseem mus migrate thiab precipitate rau saum npoo, thiab ces maj mam aggravate cov txheej txheem kev puas tsuaj ntawm refractory hluav taws castable. Peb yuav txheeb xyuas cov xwm txheej no niaj hnub no.
Qhov tshwm sim ntawm pulverization tshwm sim nyob rau hauv cov txheej txheem cia ntawm refractory castables ua los ntawm cov cement. Qee tus ntawm lawv loj hlob "cov plaub hau dawb" rau ntawm qhov chaw, feem ntau hu ua dawb alkali, ua rau pulverization ntawm txheej txheej ntawm castables, thiab nyob rau hauv cov xwm txheej hnyav, lub zog ntawm castables txo.
Carbonation ntawm castable
Carbonation ntawm siab alumina refractory cement castables feem ntau suav hais tias yog ib qho ntawm cov laj thawj tseem ceeb uas ua rau cov txheej txheem degradation thiab spalling ntawm castables. Lub siab alumina cement bonded refractory castable yog raug rau huab cua thiab cov khoom hydration reacts nrog CO2 roj hauv huab cua rau carbonation. Tsis tas li ntawd, carbonic acid feem ntau tshwm sim nyob rau hauv refractory hluav taws castables nyob rau hauv high humidity tej yam kev mob, thiab piv nrog ntom castables, lub teeb castables uas muaj cov ntsiab lus dej siab yog feem ntau pulverize, uas qhia tau hais tias nyob rau hauv lub xub ntiag ntawm dej, hydration khoom cuam tshuam nrog. CO2 acid gas, thiab PH tus nqi ntawm cov kua nyob rau hauv ib qho pore ntawm theem txo qis, uas ua rau tag nrho cov hydration neoorganisms nyob rau hauv refractory castables ua tsis ruaj tsis khov.
Piv nrog rau carbonation ntawm hydration cov khoom ntawm high aluminium cement, qhov tshwm sim ntawm sulphation tsis tau ua rau muaj kev txaus siab ntawm kev tsim kho thiab cov neeg siv khoom lag luam. Nyob rau hauv cov huab cua, ntxiv rau CO2 acid gas, kuj tseem muaj SO2, H2S thiab lwm yam gases, uas kuj muaj ib tug muaj zog yaig nyhuv ntawm cov khoom hydration ntawm lub matrix ib feem ntawm high aluminium cement castable, nws thiaj li ua rau pulverization thiab spallation ntawm. castable.
Ntxiv rau cov txheej txheem acidification tshwm sim los ntawm SO2 thiab H2S hauv huab cua, cov alumina cement hydrates kuj tseem cuam tshuam nrog SO42- lossis H ntxiv rau hauv cov dej. Nrog rau qhov nce ntawm cov dej num thiab acidity ntawm ob lub tebchaw, kev ruaj ntseg ntawm cov khoom hydration ntawm peb high-alumina cements kuj txo qis.
Salting-tawm phenomenon ntawm castable
Lub salting-tawm tshwm sim nyob rau saum npoo ntawm refractory castable yog lwm yam tseem ceeb uas ua rau aggravates cov txheej txheem tsis ua hauj lwm ntawm castable. Thaum lub sij hawm curing los yog ntuj qhuav txheej txheem ntawm refractory hluav taws castables, nrog cov evaporation ntawm dej, ib co soluble carbonate, sulfate, chloride, phosphate thiab lwm yam ntsev tebchaw tsom rau ntawm qhov chaw ntawm castables thiab crystallize tawm. Qhov tshwm sim no feem ntau hu ua ntsev-tawm phenomenon.
Raws li cov dej evaporates los ntawm qhov chaw ntawm refractory castable, cov ions tsiv teb tsaws thiab sib sau ua ke nrog cov dej molecules los ntawm sab hauv mus rau saum npoo ntawm castable, los yog hnov mob nrog cov pa roj carbon dioxide nyob rau hauv cov huab cua ntawm qhov chaw ntawm castable, thiab cov ntsev tsim tom qab cov tshuaj tiv thaiv ntawm hydrate. tsom rau ntawm qhov chaw. Thaum kawg, cov ntsev sib xyaw no crystallize tawm vim tias lawv dhau qhov solubility hauv dej.
Nyob rau hauv qhov tseeb, tag nrho cov soluble ntsev uas muaj crystalline dej, xws li chlorides, sulfates, carbonates, thiab lwm yam., tag nrho cov muaj cov txheej txheem ntawm crystalline dej tshem tawm, nrog rau cov kev hloov ntawm crystal puab thiab ntim, uas yog ib qho ntawm cov laj thawj rau aggravation ntawm nto. qauv pulverization, spalling thiab ntog tawm thaum lub sij hawm kho ntawm castables nyob rau hauv huab cua.
Txoj kev daws teeb meem
1, castable tom qab kev tsim kho kom sai li sai tau kom qhuav, tshem tawm cov dej noo, tshem tawm cov cab ntawm sodium ntsev nyob rau hauv lub cev pouring, kom alkali tuav nyob rau hauv kev tsim kho lub cev, tsis mus rau qhov chaw tsiv teb tsaws.
2, los yog cov kev tsim kho tsis tuaj yeem ncav cuag lub sijhawm kom qhuav, nws yog ib qho tsim nyog yuav tsum ua txoj haujlwm zoo ntawm qhov chaw castable kaw, qhov saum npoo npog nrog yas zaj duab xis, tiv thaiv dej nqa alkali mus rau qhov chaw tsiv teb tsaws.
3, refractory castable nrog tsawg alkali cov ntsiab lus ntawm refractory raw cov ntaub ntawv, txhim kho lub viscosity ntawm refractory hluav taws castable thiab ceev hardening, yuav txo tau qhov ceev ntawm sodium ntsev migration, ntxiv dag zog rau kev tswj zoo, nruj tswj kev tsim kho dej.
