Raws li cov khoom siv sintering feem ntau hauv kev lag luam ceramics, cov menyuam kilns ua lub luag haujlwm tseem ceeb hauv kev tsim cov khoom siv ceramic. Txawm li cas los xij, nyob rau hauv cov menyuam kilns ntawm ntau lub tuam txhab ceramic, lubrefractory bricksnyob rau ntawm lub ru tsev kiln thiab sab phab ntsa nyob rau hauv pem hauv ntej seem ntawm qhov chaw tua hluav taws feem ntau muaj kev sib txawv ntawm bulging, delamination thiab tev, tshwj xeeb tshaj yog nyob rau sab saum toj ntawm lub kiln. Qhov corrosion ntawm refractory hluav taws cib tsis tsuas yog cuam tshuam rau lub neej ntawm cov cib cib, tab sis kuj tseem cuam tshuam rau qhov zoo ntawm cov vuas ceramic yog tias cov txheej cib slag nyob rau sab saum toj ntawm lub kiln ntog. Dab tsi yog qhov ua rau corrosion ntawm refractory firebricks hauv cov menyuam kilns? Yuav ua li cas thiaj li txhim kho kev lag luam?
Cov qauv kuaj tau raug xaiv los ntawm ob lub kiln nrog refractory cib corrosion nyob rau hauv ntau yam ceramic factories, thiab X-ray fluorescence spectrochemical tsom xam txoj kev yog siv los ua lub cev lub sij hawm soj ntsuam ntawm lub qub cib thiab tev tawm ntawm ob refractory bricks, thiab cov txheej txheem corrosion ntawm pom cov hluav taws kub refractory cib. Cov tshuaj muaj poov tshuaj, sodium thiab zinc ntsiab yog tsim: zinc-aluminium spinel, leucite, sodalite, poov tshuaj orthoclase, feldspar thiab lwm cov tebchaw.
Qhov corrosion ntawm refractories bricks hauv ob sab phlu ceramic rau kilns yog tsuas yog tshwm sim los ntawm kev yaig ntawm alkali hlau compound vapor thiab zinc compound vapor nyob rau hauv lub kiln gas. Cov roj corrosive no tau tso rau hauv qhov pores thiab cov pob qij txha ntawm cov cib refractory, thiab tshuaj lom neeg nrog alumina, silica thiab lwm yam khoom hauv lub cev refractory cib los tsim cov tebchaw tshiab. Feem ntau ntawm cov mullite crystals nyob rau hauv lub cib lub cev yog decomposed, ua rau cib Hloov nyob rau hauv lub cev tshuaj muaj pes tsawg leeg thiab cov qauv. Vim hais tias cov expansion coefficient ntawm eroded txheej ntawm refractory hluav taws cib txawv heev ntawm cov thawj refractory firebricks, lub cib yuav bulge, delaminate thiab tev tawm.
Yuav kom daws tau qhov teeb meem corrosion ntawm refractory cib hauv ob sab phlu ceramic roller kiln, cov kev txhim kho hauv qab no tau npaj tseg:
(1) Ua kom qhov ntom ntom ntawm refractory hluav taws cib. High-density refractorybricks muaj me porosity, uas tuaj yeem txo cov permeability ntawm flue roj, yog li txo qhov kev yaig ntawm cov khoom siv corrosive ntawm cov cib thiab txhim kho corrosion kuj ntawm cov cib.
(2) Siv cov cib refractory nrog cov ntsiab lus alumina siab. Piv txwv li, siab alumina cib, corundum cib, alumina hollow pob cib, thiab lwm yam. muaj cov ntsiab lus alumina siab thiab zoo alkali tsis kam, thiab tuaj yeem tiv thaiv corrosion ntawm alkali hlau gases.
(3) Siv cov cib tiv thaiv alkali. Alkali-resistant bricks muaj zoo heev alkali yaig tsis kam thiab muaj peev xwm hnov mob nrog alkali tebchaw nyob rau hauv lub kiln roj ntawm ib tug tej yam kub thiab ceev tsim ib tug kaw thiab ntom tiv thaiv glaze txheej ntawm lub cib nto. Cov txheej tiv thaiv glaze no tuaj yeem tiv thaiv kev nkag mus ntxiv ntawm alkali, zam "alkali cracking" kev puas tsuaj rau lub cev cib, thiab txhim kho corrosion kuj ntawm hluav taws cib.
(4) Txau alkali-resistant refractory xim rau saum npoo ntawm refractory cib. Alkali-resistant refractory txheej tuaj yeem tiv taus qhov yaig ntawm alkali hlau vapor. Los ntawm txau alkali-resistant refractory coatings rau saum npoo ntawm hluav taws cib, txheej tiv thaiv tuaj yeem tsim rau ntawm qhov chaw ntawm cov hluav taws kub refractory cib, uas tuaj yeem txo qhov porosity ntawm cib nto thiab txo qhov cuam tshuam ntawm corrosive Cheebtsam ntawm cov cib. Corrosion, zoo heev rau kilns qhov twg hluav taws cib tau corroded. Thaum lub sij hawm tsim kho, txheej txheej corrosion yuav tsum tau polished ua ntej txau. Qhov kev ntsuas no tuaj yeem txo lub sijhawm thiab tus nqi ntawm qhov cub kaw kev saib xyuas thiab txuas ntxiv lub neej kev pab cuam ntawm refractory bricks.
