Desulfurization Gypsum yog cov roj fluetion los ntawm kev sib txuas ua ke ntawm cov roj duelum (thee, tshuaj lom neeg (cov mis nyuj ntawm ntuj tsim gypsum. Yog li ntawd, muaj ntau ntau thiab ntau cov kev tshawb fawb thiab kev siv ntawm kev siv Desulfurized Gypsum es tsis txhob tsim cov khoom siv nyiaj txiag. Organic Polymer Admixtures xws li dej txo tus neeg sawv cev, dej tuav tus neeg sawv cev thiab cov Retarder yog cov khoom siv ua haujlwm tseem ceeb ntawm kev sib xyaw ntawm tus kheej cov ntaub ntawv colleming. Qhov kev sib cuam tshuam thiab kev siv tshuab ntawm ob nrog cov xis ua kom zoo nkauj yog cov teeb meem tsim nyog saib ib qho. Vim tias cov yam ntxwv ntawm cov txheej txheem tsim, lub ntsej muag yog qhov tsis txaus ntseeg ntawm 40 thiab 60 μd Kev npaj slurry npaj los ntawm nws feem ntau yooj yim segregation, stratification thiab los ntshav tshwm sim. Cellulose ether yog feem ntau siv admixture hauv kev ua haujlwm ntawm dej yog qhov tseem ceeb ntawm kev ua haujlwm ntawm dej yog qhov tseem ceeb ntawm kev tsim kho cov neeg saib xyuas kev ua haujlwm xws li kev ua haujlwm thiab kev ua tau zoo tom qab.
Hauv daim ntawv no, tus nqi fluidity yog siv los ua kev tswj hwm (kis degree 14 mm), tsom mus rau qhov muaj nuj nqis ether thiab molecosione muaj nuj nqis ether -TTxawm cov ntaub ntawv, cov kev poob ntawm fluidity nyob rau lub sijhawm, thiab cov sib co raws txoj cai ntawm cov khoom muaj txiaj ntsig zoo li lub sijhawm thiab cov neeg kho tshuab cov tshuab; Nyob rau tib lub sijhawm, sim txoj cai ntawm kev cuam tshuam etherum, thiab pib sib tham txog cov kev ua kom sov thiab pib tawm ntawm cov kev ua kom muaj kev sib tham ntawm kev ua haujlwm ntawm cov pa roj hmab Cov.
1. Cov ntaub ntawv tso tawm thiab cov qauv ntsuas
1.1 Cov Khoom Siv Raw
Gypsum hmoov: Desulfurized Gypsum hmoov tsim los ntawm cov tuam txhab hauv Tangshan, nws cov tshuaj nchuav yog qhia hauv Table 1, thiab nws cov khoom siv lub cev tau qhia hauv Table 2.
daim duab
daim duab
Admixtures suav nrog: cellulose ether (hydroxypropylulose, HPMC kom luv); Superoplasterizer wr; Defoamer B-1; Eva redispersible looj hmoov s-05, txhua yam uas yog kev lag luam muaj.
Kev sib sau: ntuj dej xuab zeb, tus kheej-ua kom zoo nkauj xuab zeb sieved los ntawm 0.6 hli sab cib.
1.2 Txoj Kev Ntsuas
Taag Desulfurization Gypsum: Xuab zeb: Dej = 1: 0.5: 0.5: 0.5: 0.5: 0.5: ) 0, 0.5 ‰, 1.0 ‰, 2.0 ‰, 3.0 ‰ cellulose ether (HPMC-20,000); txuas ntxiv kho cov tshuaj ntawm cellulose ether rau 1 ‰, thiab HPMC-25,000 Hydmc-25,000, H4, H7.5, thiab H10 ), txhawm rau kawm cov tshuaj thiab cov phaus molecular (viscosity tus nqi) ntawm ob qho kev hloov ntawm ob qho ntawm ob ntawm cov khoom siv fluidity, teeb tsa lub sij hawm thiab cov neeg kho tshuab thaum ntxov ntawm Lub Desulfurized Gypsum tus kheej tus kheej txoj kev khib sib xyaw sib txawv. Txoj kev ntsuas kev xeem yog nqa tawm raws li qhov yuav tsum tau ntawm GB / T 17669.3-1999 "kev txiav txim siab ntawm cov neeg kho tshuab ntawm lub tsev Gypsum".
Qhov kev ntsuas kub ntawm cov dej kub yog nqa tawm siv cov qauv khoob ntawm cov ntsiab lus desulfurized ntawm 0.5 ether, feem, siv tau, thiab siv lub tshuab hluav taws xob.
2. Cov Ntsiab Lus thiab Kev Ntsuam Xyuas
2.1 nyhuv ntawm cellulose cov ntsiab lus ntawm cov khoom tseem ceeb ntawm cug vol
Nrog kev nce cov ntsiab lus, kev ua haujlwm thiab cohesion ntawm lub tshuaj txug tau txhim kho, thiab kev tsim kho kom zoo dua, thiab kev ua kom zoo dua, thiab cov khoom siv tawv tawv tsis muaj qhov tshwm sim tsis zoo, thiab saum npoo du, Smoontness thiab loog tau zoo dua qub. Nyob rau tib lub sijhawm, cov dej tau haus ntawm cug cug kom ua tiav cov fluidity tib yam. Thaum 5 ‰, kev siv dej tau nce los ntawm 102%, thiab lub sijhawm teem sijhawm kawg tau ntev los ntawm 100 min, uas yog 2.5 zaug uas yog cov qauv seem. Lub tshuab tshuaj kho thaum ntxov ntawm cap txwv qis dua nrog kev nce ntawm cov ntsiab lus ntawm cellulose ether. Thaum cov ntsiab lus ntawm cellulose ether yog 5 ‰, 24 h Lub zog compressive yog 39.47% thiab 23.45% ntawm cov qauv tsis muaj. Nws yog tsim nyog sau tseg tias nrog kev nce ntawm cov dej-tuav tus neeg sawv cev, ntawm kev ntom nti ntawm coll / m3 ntawm 0 mus rau 1747 ntawm 5 ‰, ib qho txo qis ntawm 15.56%. Qhov ceev ntawm lub tshuaj khib txo qis thiab qhov porosity nce, uas yog ib qho ntawm cov laj thawj rau qhov pom tseeb ntawm cov khoom siv tshuaj tsuag ntawm lub cug.
Cellulose ether yog cov tsis-ionic polymer. Cov pab pawg hydroxyl ntawm lub cellulose ether saw atoms rau ntawm cov dej olecules los tsim cov dej lwg hydrogen ua ke, yog li ua lub luag haujlwm hauv dej rov qab. Macroscopically nws yog manifested raws li kev nce hauv cohesiveness ntawm slurry [5]. Qhov nce nyob rau hauv slurry viscosity yuav tsis tsuas yog nce cov dej noj mov, tab sis kuj yog cov khoom noj uas tsis muaj qab hau, tab sis kuj yog cov tshuaj tiv thaiv ntawm cov dej; Thaum lub sij hawm cov txheej txheem stirring, muaj ntau ntawm cov pa npuas huab yuav tseem yuav tau qhia. Voids yuav tsim raws li lub cug hardens, nws thiaj li txo lub zog ntawm lub tshuaj khib. Kev txiav txim siab txog kev noj tshuaj cug sib xyaw, thiab tom qab ntawd cov ntsiab lus ntawm kev tsim kho, thiab tom qab ntawd cov ntsiab lus siv hluav taws xob
2.2 Cov nyhuv ntawm kev hnyav molecular ntawm cellulose ether rau ntawm kev ua tshuaj cug
Feem ntau, qhov ntau dua cov viscosity thiab finer rau fineness ntawm cellulose ether, qhov zoo dua cov dej rov qab ua kom lub zog. Kev ua tau zoo yuav raug cuam tshuam. Yog li ntawd, tus yam ntxwv ntawm cellulose muaj kev hais txog kev hnyav molecular ntawm cov khoom tseem ceeb ntawm gypsum-based tus kheej txoj kev siv kab colleging. Cov dej yuav tsum tau siv tshuaj khib ntau ntxiv rau qee yam, tab sis tsis muaj qhov tshwm sim ntawm lub sijhawm thiab fluidity. Nyob rau tib lub sijhawm, cov flualural thiab compressive ua lub zog hauv cov xeev txawv, tab sis qhov kev poob qis dua li cov ntsiab lus ether ether cov khoom siv. Hauv cov ntsiab lus, qhov nce ntawm cov molecular hnyav ntawm cellulose ether tsis muaj qhov tshwm sim ntawm kev ua tiav cug sib xyaw. Xav txog qhov yooj yim ntawm kev tsim kho, qis-viscosity thiab me-molecular cellulose cellulose cellulose gypsum-raws tus kheej cov ntaub ntawv ntawm tus kheej.
2.3 Cov nyhuv ntawm cellulose ether rau ntawm kub ntawm kev kub ntawm desulfurized gypsum
Nrog rau kev nce ntawm cov ntsiab lus ntawm cellulose ether, cov kev ua haujlwm ntawm kev poob qis ntawm cov dej ua haujlwm me me, tab sis tsis yog obviously. Qhov no qhia tau hais tias cellulose ether tuaj yeem ncua kev tswj cov dej haus thiab ntau dhau yuav tsum tsis txhob loj dhau, thiab yuav tsum tau tswj hwm tsis pub dhau 1 ‰. Nws tuaj yeem pom tau tias zaj duab xis colloidal tsim tom qab cellulose raws cov dej yog adsorbed gypsum cov lus, uas txo cov dej num ntawm cov gypsum ua ntej 2 h. Nyob rau tib lub sijhawm, nws cov dej tsis sib haum ncua thiab tsis txaus ntseeg tau txais txiaj ntsig ntxiv rau kev ua haujlwm ntawm cov neeg desulfurized gypsum hauv tom qab. Txhawm rau kom suav tau, thaum cov tshuaj muaj txiaj ntsig zoo yog tswj hwm, cellulose ether muaj tsawg tus nqi thiab kev kawm hydration ntawm desulfurized gypsum nws tus kheej. Nyob rau tib lub sijhawm, nce ntawm cellulose cellule cov ntsiab lus thiab lub cev hnyav yuav ua rau cov dej viscosity ntawm slurry thiab qhia tau zoo heev cov dej ua haujlwm zoo. Txhawm rau kom cov fluulity ntawm cov desulfurized gypsum tus kheej cug, cov dej yuav nce ntxiv, uas yog vim lub sijhawm caij nyoog ntawm lub cug. Qhov laj thawj tseem ceeb rau kev poob hauv cov khoom siv tshuab.
3. Xaus
(1) Thaum siv cov fellity yog siv los ntawm kev tswj hwm cov ntsiab lus etherum-raws li lub sij hawm desulfing, thiab cov khoom siv mechanies tau txo qis; Piv nrog cov ntsiab lus, cov molecular hnyav ntawm cellulose ether cov nce zuj zus ntawm cov khoom cug. Xav txog kev nkag siab, cellulose ether yuav tsum raug xaiv nrog lub cev me me molecular (viscosity tus nqi qis dua 20 ‰ cov khoom siv tsis pub dhau 1 ‰ ntawm cov khoom noj kom huv.
(2) Cov txiaj ntsig kev ntsuas kub ntawm kev ua pa ntawm desulfurized gypsum qhia tias nyob rau hauv cov kev ntsuas ntawm cov dej ntawm cov dej num ntawm desulfurized gypsum. Kev nce hauv kev siv dej thiab kev txo qis hauv cov laj thawj loj yog cov laj thawj tseem ceeb rau kev txo qis ntawm desulfurized gypsum-raws cugsum-raws coll.
Lub Sijhawm Post: Lub Tsib Hlis-08-2023