Feem ntau, thaum lub sij hawm curing txheej txheem ntawmqis cement castablesThaum lub sij hawm tsim khoom, lub ntuj tso pa tawm theem yog nyob rau hauv 24 teev. Qhov dawb paug yog me ntsis kub thiab qhov chaw hardens maj mam. Tom qab 3 mus rau 5 hnub ntawm kev tso kawm, qhov saum npoo yuav tev tawm, thiab cov xim dawb dawb yuav tshwm nyob ib ncig ntawm cov npuas pores. Maj mam nias nrog koj txhais tes thiab pom tias qhov saum npoo 3 mus rau 5 hli twb softened thiab maj mam hmoov thiab tev tawm, thiab ib txhia txawm mus txog 10 mus rau 15 mm. Qhov no ua rau muaj kev cuam tshuam rau lub zog ntawm cov khoom siv tshiab, ua rau txo qis hauv kev pabcuam lub neej ntawm cov khoom siv, kom nws tsis tuaj yeem siv. Nqa cov qauv uas nyuam qhuav tau nchuav thiab ua kom khov thiab cov qauv tom qab hmoov rau kev ntsuas lub cev.
1. Kev tshuaj xyuas qhov ua rau ntawm qhov chaw puas
a. Deg hmoov tshwm sim los ntawm "alkali impurities"
Nyob rau hauv cov mis ntawm refractory castables, lub ntsiab refractory raw cov ntaub ntawv, cement thiab sodium ntsev admixtures muaj soluble sodium. Nyob rau hauv cov ntaub ntawv low-end refractory raw khoom, cov ntsiab lus ntawm alkali hlau impurities feem ntau yog siab heev. Admixtures tseem yuav qhia txog sodium ions, thiab qhov nce ntawm cov cement yuav ua rau kom cov alkalinity ntawm lub system.
Soluble alkali nyob rau hauv qis cement castable yuav dissociate thaum nws ntsib dej, thiab react nrog carbon dioxide nyob rau hauv cov huab cua los tsim carbonates. Nyob rau tib lub sijhawm, cov cement yuav hydrate, thiab ob qho tib si yuav rov ua dua. Tsis tu ncua decompose thiab calcify.
Tsuav yog muaj cov khoom siv cement hydration, cov tshuaj tiv thaiv saum toj no yuav raug nthuav tawm, thiab cov khoom tawg tas li yuav ua rau muaj kev puas tsuaj rau cov castable compact los ntawm sab nraud mus rau sab hauv.
b. Curing ambient kub thiab humidity
Thaum lub castable yog cam khwb cia, qhov dav curing kub yog 15-20 degree . Prefabricated blocks loj yuav nkag mus rau hauv qhov cub kub kub rau kev kho ntawm 30-35 degree txhawm rau txhawm rau txhawm rau kho lub zog. Ua tib zoo soj ntsuam pom tau hais tias qhov nce hauv qhov kub thiab txias tuaj yeem txhim kho lub zog thiab kev pabcuam lub neej ntawm lub cev ntsuab, thiab cov hmoov tshwm sim ntawm lub cev ntsuab saum npoo yog txo qis dua. Nws tuaj yeem pom tau tias qhov kub thiab av noo ntawm lub cev ntsuab kho yog qhov tseem ceeb hauv kev puas tsuaj.
c. Kev cuam tshuam ntawm lub cev ntsuab ntom ntom
Qhov ceev ntawm lub cev ntsuab kuj yog ib qho tseem ceeb ua rau cov hmoov ntawm cov castable nto. Thaum qhov ntom ntawm lub cev ntsuab qis, qhov porosity nce, thiab cov dej thiab carbon dioxide nyob rau hauv cov huab cua tuaj yeem yooj yim dua mus rau hauv lub cev ntsuab, ua rau muaj kev puas tsuaj, uas ua rau decomposition thiab hmoov ntawm lub cev ntsuab los ntawm ntiav mus rau. tob.
d. Kev cuam tshuam ntawm cov dej ntxiv thaum tsim kho
Thawj lub zog thiab kev tsim kho ntawm castables yog ze ze rau cov dej ntxiv thaum tsim kho. Ntxiv dej ntxiv tuaj yeem txhim kho kev tsim kho, tab sis nws muaj qee yam kev mob tshwm sim ntawm qhov pib lub zog thiab qhov ntom ntom ntawm lub cev ntsuab. Nyob rau tib lub sijhawm, kev ntxiv dej ntau ntxiv yuav ua rau muaj kev cuam tshuam hydration, ua rau nws yooj yim dua rau lub cev ntsuab kom dhau los ua hmoov. Nws yog qhov nyuaj kom ua tau raws li qhov yuav tsum tau ua ntawm kev tsim kho los ntawm kev tswj cov dej ntxiv, yog li cov dej ntxiv thaum lub sij hawm tsim kho kuj yog ib qho tseem ceeb rau kev puas tsuaj.
2. Kev daws rau castable nto puas
Raws li kev txheeb xyuas uas twb muaj lawm ntawm qhov ua rau muaj kev puas tsuaj rau saum npoo ntawm cov cement castables tsawg, cov kev ntsuas raug coj los tiv thaiv lossis txo qhov degree ntawm qhov kev puas tsuaj.
a. Siv high-purity raw khoom
High-purity thiab high-density raw cov ntaub ntawv yuav txo tau cov ntsiab lus ntawm soluble alkali hlau. Piv txwv li, refractory alumina aggregates yuav tsum tau calcined nyob rau hauv rotary kilns ntau npaum li sai tau, nrog tsawg impurities thiab siab bulk ntom, los yog ntom corundum yuav tsum tau siv raws li aggregates. Rau cov khoom siv raw uas tsis tau calcined, cov ntsiab lus impurity yuav tsum tau tswj nruj me ntsis, thiab cov nyiaj ntxiv yuav tsum tau tswj kom tsawg li sai tau.
b. Tsim nyog xaiv ntawm cov khoom sib xyaw
Cov tsoos castable admixtures feem ntau yog siv lignin calcium ntsev thiab sodium ntsev, uas ua rau kom cov alkali hlau ntsiab lus ntawm castable thiab accelerates lub hydration thiab decomposition cov tshuaj tiv thaiv. Tom qab kev hloov kho, ib hom tshiab ntawm cov dej sib xyaw ua ke tau sim los txo qhov sib ntxiv ntawm calcium ntsev thiab nruj me ntsis tswj cov nyiaj ntxiv. Tom qab kuaj xyuas qhov ntsuas, qhov kev sim tau ua tiav hauv kev tsim khoom los hloov hom admixture thiab ua tiav qhov kev pom zoo ntxiv. Qhov tshwm sim ntawm cov hmoov hmoov rau saum npoo ntawm lub cev ntsuab tau txhim kho, txuas ntxiv ntawm 3 mus rau 5 hnub mus txog ib lub lis piam, thiab lub zog ntawm lub cev ntsuab kuj tau txhim kho. Cov teebmeem ntawm cov khoom sib txawv ntawm qhov kev ua tau zoo ntawm cov castables yog qhia nyob rau hauv Table 2. Nyob rau hauv txoj kev no, ua ke nrog kev tswj lub sij hawm kom qhuav, ziab kom sai li sai tau, thiab txhim kho lub zog thaum ntxov, cov hmoov av ntawm lub cev ntsuab tsis tshua muaj tshwm sim.
Duab
c. Tswj kev tsim kho dej
Txhim khu kev tswj ntawm kev tsim kho dej zoo, sim ua kom dej nag hauv lub thawv loj ua ntej kev tsim khoom, tsis txhob turbidity thiab impurities hauv dej, thiab lwm yam., kom txo tau qhov nkag ntawm lwm cov khoom sib xyaw uas tuaj yeem ua rau kom cov hydration ntawm cov cement.
d. Tswj kev tsim kho ib puag ncig
Txhawm rau txo thiab txo qis kev sib cuag ntawm qhov chaw ntawm cov cement castable thiab huab cua, cov txheej txheem npog saum npoo yog siv los kaw cov pores saum npoo, thiab sim cais cov diffusion ntawm carbon dioxide thiab dej vapor mus rau hauv lub cev castable, yog li tiv thaiv. kev puas tsuaj. Nyob rau tib lub sijhawm, txhawm rau kom qhuav lub cev kom sai li sai tau, cov rwb thaiv tsev ntawm lub Hoobkas tau ntxiv dag zog, thiab thaum tsim nyog, lub cev tau muab tso rau hauv qhov cub kub kub kom qhuav thiab demoulding, kom lub cev hardens nyob rau hauv lub qhov cub. Lub sijhawm kho kom zoo ntawm 36 teev kom ntseeg tau tias lub zog ntawm lub cev cam khwb cia.
