Desulfurization gypsum waa gaaska flue ee ay soo saarto gubashada shidaalka sulfur-ku jira (dhagaxda, batroolka), qashinka adag ee warshadaha ee la soo saaro inta lagu jiro habka nadiifinta desulfurization, iyo gypsum hemihydrate (caSO4 · 0.5H2O), waxqabadka ayaa la mid ah taas gypsum dhismaha dabiiciga ah. Sidaa darteed, waxaa jira cilmi-baarisyo badan oo badan iyo codsiyada isticmaalka gypsum desulfurized halkii gypsum dabiiciga ah si loo soo saaro walxaha is-miidaaminta. Isku-darka polymer-ka-dabiiciga ah sida wakiilka biyaha-yareeya, wakiilka biyaha haynta iyo dib-u-dejiyayaashu waa qaybo hawleed oo muhiim ah oo ka kooban walxaha hoobiye ee is-miidaya. Is dhexgalka iyo habka labada qalab sibidh ah ayaa ah arrimo mudan in fiiro gaar ah loo yeesho. Sababtoo ah sifooyinka habka formation, ganaaxa gypsum desulfurized waa yar yahay (xajmiga qayb waxaa inta badan loo qaybiyaa inta u dhaxaysa 40 iyo 60 μm), iyo budada budada ah waa mid aan macquul ahayn, sidaas darteed sifooyinka rheological ee gypsum desulfurized waa liitaa, iyo hoobiye slurry ay diyaarisay inta badan way fududahay Kala soocida, kala saarista iyo dhiigbaxa. Ether-ka Cellulose waa isku-darka ugu badan ee loo isticmaalo hoobiye, iyo isticmaalka isku-darka ah ee loo isticmaalo biyo-yaraynta waa dammaanad muhiim ah si loo xaqiijiyo waxqabadka dhamaystiran ee gypsum-ku-salaysan ee alaabta is-heeraynta ah sida waxqabadka dhismaha iyo farsamada dambe ee waxqabadka.
Warqadan, qiimaha dareeraha waxaa loo isticmaalaa sida tusaha xakamaynta (fidinta heerka 145 mm ± 5 mm), diiradda saaraya saameynta ka kooban ether cellulose iyo miisaanka molecular (qiimaha viscosity) ee isticmaalka biyaha ee gypsum-ku-saleysan. Qalabka heerka sare ah, luminta dareeraha waqti ka dib, iyo xinjirowga Sharciga saameynta hantida aasaasiga ah sida wakhtiga iyo sifooyinka hore ee farsamada; Isla mar ahaantaana, tijaabi sharciga saamaynta ether cellulose on sii daayo kulaylka iyo heerka sii daayo kulaylka fuuq gypsum desulfurized, falanqeeyaan saamaynta ay ku habka fuuqbaxa ee gypsum desulfurized, iyo markii hore ka wada hadal noocan ah admixture Waafaqid nidaamka gypsum gelling desulfurization. .
1. Qalabka ceeriin iyo hababka tijaabada
1.1 Qalabka ceeriin
Budada Gypsum: budada gypsum desulfurized oo ay soo saartay shirkad ku taal Tangshan, ka kooban macdanta ugu weyn waa hemihydrate gypsum, ka kooban kiimikaad waxa lagu muujiyay shaxda 1, iyo sifooyinka jireed ayaa lagu muujiyay shaxda 2.
sawir
sawir
Isku-darka waxaa ka mid ah: ether cellulose (hydroxypropyl methylcellulose, HPMC oo gaaban); superplasticizer WR; foamer B-1; EVA budada cinjirka ah ee S-05 dib loo firdhi karo, kuwaas oo dhamaantood ganacsi ahaan la heli karo.
Isku geynta: ciid webiga dabiiciga ah, ciid wanaagsan oo iskeed isku samaysay oo lagu miiray shaandho 0.6 mm ah.
1.2 Habka tijaabada
Gypsum desulfurization go'an: ciid: biyaha = 1: 0.5: 0.45, qadarka ku haboon ee admixtures kale, dareere sida index kontoroolka (ballaarinta 145 mm ± 5 mm), iyadoo la hagaajinayo isticmaalka biyaha, siday u kala horreeyaan isku qasan alaabta cementitious (gypsum desulfurization + Cement). ) 0, 0.5‰, 1.0‰, 2.0‰, 3.0 ‰ cellulose ether (HPMC-20,000); sii hagaajin qiyaasta ether cellulose ilaa 1 , dooro HPMC-20,000, HPMC-40,000 , HPMC-75,000, iyo HPMC-100,000 hydroxypropyl methylcellulose ethers oo leh miisaanyo kala duwan oo molecular ah (tirooyinka u dhigma waa H2, siday u kala horreeyaan, H4. ), in la barto qiyaasta iyo Miisaanka molecular (qiimaha viscosity) ee ether cellulose Saamaynta isbeddellada ee guryaha gypsum-ku-salaysan hoobiyeyaasha is-habaynta, iyo saamaynta labada ee dareeraha, dejinta wakhtiga iyo sifooyinka hore ee farsamada ee gypsum-ka-soo-baxa is-xakamaynta. isku dar ah ayaa laga hadlayaa. Habka tijaabada gaarka ah waxaa loo fuliyaa si waafaqsan shuruudaha GB/T 17669.3-1999 "Go'aaminta Qalabka Farsamada ee Dhismaha Gypsum".
Tijaabada kulaylka fuuqbaxa waxa lagu sameeyaa muunad maran oo ah gypsum desulfurized ah iyo muunado ay ku jiraan ether-ka cellulose ee 0.5‰ iyo 3‰, siday u kala horreeyaan, iyo qalabka la isticmaalay waa nooca TA-AIR ee kuleyliyaha fuuq-baxa.
2. Natiijooyinka iyo falanqaynta
2.1 Saamaynta maadada ether-ka cellulose ee sifooyinka aasaasiga ah ee hoobiye
Marka la kordhiyo nuxurka, shaqada iyo isku xirnaanta hoobiye ayaa si weyn u wanaajinaya, luminta dareeraha waqti ka dib si weyn ayaa loo yareeyaa, waxqabadka dhismuhu waa mid aad u fiican, iyo hoobiye adag oo aan lahayn ifafaale delamination, iyo simanaanta dusha sare. sinnaan iyo bilicda si weyn ayaa loo hagaajiyay. Isla mar ahaantaana, isticmaalka biyaha ee hoobiye si loo gaaro dheecaan isku mid ah ayaa si weyn u kordhay. Marka la joogo 5‰, isticmaalka biyaha ayaa kordhay 102%, iyo wakhtiga dejinta ugu dambeeya ayaa lagu dheeraaday 100 min, taas oo ahayd 2.5 jeer ka muunad bannaan. Qalabka hore ee farsamada ee hoobiye ayaa si weyn hoos ugu dhacay kororka maadada etherka cellulose. Marka nuxurka ether-ka cellulose uu ahaa 5 ‰, 24 h xoogga dabacsanaanta iyo xoogga cadaadiska ayaa hoos u dhacay 18.75% iyo 11.29% ee muunadda bannaan siday u kala horreeyaan. Awooda cadaadisku waa 39.47% iyo 23.45% ee muunada banaan siday u kala horreeyaan. Waxaa xusid mudan in kororka qiyaasta wakiilka biyaha, cufnaanta ugu badan ee hoobiye ayaa sidoo kale si weyn hoos ugu dhacday, laga bilaabo 2069 kg / m3 ee 0 ilaa 1747 kg / m3 ee 5 ‰, hoos u dhaca 15.56%. Cufnaanta hoobiye ayaa hoos u dhacda oo kor u kaca, taas oo ah mid ka mid ah sababaha hoos u dhaca cad ee sifooyinka farsamada ee hoobiye.
Eter cellulose waa polymer aan ionic ahayn. Kooxaha hydroxyl ee silsiladda ether-ka cellulose iyo atamka ogsijiinta ee bond ether-ku waxay isku dari karaan molecules biyaha si ay u sameeyaan curaarta hydrogen, iyagoo u beddelaya biyaha bilaashka ah biyo xidhxidhan, taas oo door ka ciyaaraysa haynta biyaha. Macroscopically Waxa lagu muujiyaa korodhka isku-xidhnaanta slurry [5]. Kordhinta viscosity slurry kaliya ma kordhin doonto isticmaalka biyaha, laakiin sidoo kale ether-ka cellulose ether ee kala diri ayaa lagu dhejin doonaa dusha sare ee qaybaha gypsum, taas oo caqabad ku ah falcelinta fuuq-celinta iyo kordhinta waqtiga dejinta; Inta lagu jiro habka walaaqaya, tiro badan oo ah goobooyin hawo ayaa sidoo kale la soo bandhigi doonaa. Faaruqyadu waxay samaysan doonaan marka hoobiyeku adkaado, ugu dambayntiina waxay yareeyaan awoodda hoobiye. Si dhammaystiran loo tixgeliyo isticmaalka biyaha hal dhinac ee isku dhafka hoobiye, waxqabadka dhismaha, dejinta waqtiga iyo guryaha farsamada, iyo cimri dhererka dambe, iwm., maadada ether-ka cellulose ee ku jirta gypsum-ku-saleysan hoobiyeyaasha is-dheellitirka ah waa inaysan ka badnayn 1 ‰.
2.2 Saamaynta miisaanka molecular ee ether cellulose ee waxqabadka hoobiye
Caadi ahaan, mar kasta oo viscosity-ku sarreeyo iyo sida uu u fiicnaado ether-ka cellulose, ayaa ka sii wanagsan sii-haysashada biyaha waxayna kordhisaa xoogga isku-xidhka. waxqabadka ayaa si xun u saameyn doona. Sidaa darteed, saamaynta ethers cellulose ee miisaanka molecular ee kala duwan ee sifooyinka aasaasiga ah ee gypsum-ku-salaysan ee qalabka hoobiyeyaasha ee is-beddelka ah ayaa la tijaabiyay. Baahida biyaha ee hoobiye ayaa kor u kacday ilaa xad, laakiin wax saameyn ah kuma yeelan waqtiga dejinta iyo dareeraha. Isla mar ahaantaana, awoodaha dabacsanaanta iyo cufan ee hoobiye ee gobollo kala duwan ayaa muujiyay hoos u dhac, laakiin hoos u dhacu wuxuu ahaa mid aad u yar marka loo eego saameynta ether-ka cellulose ee sifooyinka farsamada. Marka la soo koobo, kororka miisaanka kelli ee ether cellulose wax saameyn ah kuma laha waxqabadka isku dhafka hoobiye. Iyadoo la tixgelinayo habboonaanta dhismaha, viscosity-hooseeya iyo ether-yar-yar oo miisaan-molecular cellulose ether ah waa in loo doortaa sida qalabka is-dheellitirka ah ee gypsum-ku-salaysan.
2.3 Saamaynta etherka cellulose ee kulaylka fuuq-celinta ee gypsum-ka
Iyadoo kororka ee content ether cellulose, ugu sarreysa exothermic ee fuuq-baxa gypsum desulfurized si tartiib tartiib ah hoos u dhacay, iyo wakhtiga booska ugu sarreysa ayaa wax yar dib u dhac, halka kulaylka exothermic ee fuuq-baxa hoos u dhacay, laakiin ma cad. Tani waxay muujinaysaa in ether-ka cellulose uu dib u dhigi karo heerka fuuq-celinta iyo heerka fuuq-celinta ee gypsum desulfurized ilaa xad, sidaa daraadeed qiyaasta waa inaysan noqon mid aad u weyn, waana in lagu xakameeyaa gudaha 1 ‰. Waxaa la arki karaa in filimka kolloidal ee la sameeyay ka dib markii ether cellulose uu la kulmo biyaha lagu dhajiyo dusha sare ee qaybaha gypsum-ka-soo-saarka, taas oo yaraynaysa heerka fuuq-celinta gypsum ka hor 2 h. Isla mar ahaantaana, haynta biyaha gaarka ah iyo saamaynta dhumucdeedu waxay dib u dhigaysaa uumi-baxa biyaha dareeraha ah waxayna faa'iido u leedahay fuuq-celinta dheeraadka ah ee gypsum-ka-soo-saarka ee marxaladda dambe. Marka la soo koobo, marka qiyaasta ku habboon la kantaroolo, ether cellulose ayaa saameyn xaddidan ku leh heerka fuuq-celinta iyo heerka fuuq-celinta ee gypsum laftiisa. Isla mar ahaantaana, kororka maadada ether-ka cellulose iyo miisaanka kelli waxay si weyn u kordhin doontaa viscosity of slurry waxayna muujineysaa waxqabadka xajinta biyaha ee aad u fiican. Si loo hubiyo dareeraha dareeraha gypsum-ka-soo-baxa ah ee is-beddelka ah, isticmaalka biyaha ayaa si weyn u kordhin doona, taas oo ay ugu wacan tahay wakhtiga dejinta dheeraadka ah ee hoobiye. Sababta ugu weyn ee hoos u dhaca guryaha farsamada.
3. Gabagabo
(1) Marka dheecaanka loo isticmaalo sida tusaha xakamaynta, iyada oo la kordhinayo maadada ether cellulose, wakhtiga dejinta ee gypsum-ku-salaysan ee is-dheellitirka is-xakamaynta ayaa si weyn u dheereysa, sifooyinka farsamada ayaa si weyn loo dhimay; Marka la barbardhigo waxa ku jira, miisaanka kelli ee ether cellulose Korodhka ayaa saameyn yar ku leh sifooyinka kor ku xusan ee hoobiye. Iyadoo la tixgelinayo guud ahaan, ether cellulose waa in lagu doortaa miisaan yar oo kelli ah (qiimaha viscosity ee ka hooseeya 20 000 Pa·s), qiyaasta waa in lagu xakameeyaa gudaha 1 ‰ ee walxaha sibidhka.
(2) Natiijooyinka tijaabada ee kulaylka fuuq-celinta ee gypsum desulfurized ayaa muujinaya in baaxadda tijaabadan, ether cellulose ay saameyn xaddidan ku leedahay heerka fuuq-celinta iyo habka fuuq-celinta ee gypsum-ka-soo-saarka. Korodhka isticmaalka biyaha iyo hoos u dhaca cufnaanta bulk ayaa ah sababaha ugu waaweyn ee hoos u dhaca sifooyinka farsamada ee hoobiyeyaasha gypsum-ku-salaysan ee sulfurized.
Waqtiga boostada: Meey-08-2023