Cov gypsum desulfurization yog cov khoom lag luam gypsum tau los ntawm kev desulfurizing thiab purifying cov roj flue tsim tawm tom qab combustion ntawm cov roj uas muaj sulfur los ntawm cov txiv qaub ntsuab zoo lossis cov hmoov limestone slurry. Nws cov tshuaj lom neeg muaj pes tsawg leeg zoo ib yam li cov dihydrate gypsum ntuj, feem ntau yog CaSO4 · 2H2O. Tam sim no, kuv lub teb chaws txoj kev tsim hluav taws xob tseem yog dominated los ntawm cov thee hluav taws xob tsim hluav taws xob, thiab SO2 tso tawm los ntawm cov thee hauv cov txheej txheem ntawm cov hluav taws xob thermal suav rau ntau dua 50% ntawm kuv lub teb chaws cov pa phem txhua xyoo. Muaj ntau cov pa phem sulfur dioxide tau ua rau muaj kuab paug rau ib puag ncig. Kev siv cov thev naus laus zis flue gas desulfurization los tsim cov gypsum desulfurized yog ib qho tseem ceeb los daws qhov kev txhim kho thev naus laus zis ntawm cov lag luam cuam tshuam nrog thee hluav taws xob. Raws li cov ntaub ntawv tsis tiav, cov pa phem ntawm cov gypsum desulfurized ntub hauv kuv lub teb chaws tau tshaj 90 lab t / a, thiab txoj kev ua cov gypsum desulfurized feem ntau yog piled, uas tsis tsuas yog nyob hauv av, tab sis kuj ua rau muaj kev pov tseg loj heev ntawm cov peev txheej.
Gypsum muaj cov haujlwm ntawm lub teeb yuag, txo suab nrov, tiv thaiv hluav taws, rwb thaiv tsev thermal, thiab lwm yam. Nws tuaj yeem siv rau hauv kev tsim cement, kev tsim kho gypsum, kev kho kom zoo nkauj thiab lwm yam teb. Tam sim no, ntau tus kws tshawb fawb tau ua kev tshawb fawb txog plastering plaster. Kev tshawb fawb qhia tau hais tias cov khoom siv plastering plaster muaj micro-expansion, ua haujlwm tau zoo thiab plasticity, thiab tuaj yeem hloov cov khoom siv plastering ib txwm rau kev kho kom zoo nkauj phab ntsa sab hauv tsev. Kev tshawb fawb los ntawm Xu Jianjun thiab lwm tus tau qhia tias desulfurized gypsum tuaj yeem siv los ua cov khoom siv phab ntsa sib dua. Kev tshawb fawb los ntawm Ye Beihong thiab lwm tus tau qhia tias cov plastering gypsum tsim los ntawm desulfurized gypsum tuaj yeem siv rau txheej plastering ntawm sab hauv ntawm phab ntsa sab nraud, phab ntsa sab hauv thiab qab nthab, thiab tuaj yeem daws cov teeb meem zoo xws li kev plhaub thiab tawg ntawm cov plastering mortar ib txwm muaj. Lub plastering gypsum sib dua yog ib hom tshiab ntawm cov khoom siv plastering uas zoo rau ib puag ncig. Nws yog ua los ntawm hemihydrate gypsum ua cov khoom siv cementitious tseem ceeb los ntawm kev ntxiv cov khoom sib xyaw thiab cov khoom sib xyaw. Piv nrog cov khoom siv plastering cement ib txwm muaj, nws tsis yooj yim tawg, lo zoo khi, shrinkage zoo, ntsuab thiab kev tiv thaiv ib puag ncig. Kev siv cov gypsum desulfurized los tsim cov hemihydrate gypsum tsis yog tsuas yog daws qhov teeb meem ntawm kev tsis muaj cov peev txheej ntuj tsim gypsum, tab sis kuj paub txog kev siv cov peev txheej ntawm desulfurized gypsum thiab ua tiav lub hom phiaj ntawm kev tiv thaiv ib puag ncig. Yog li ntawd, raws li kev tshawb fawb ntawm desulfurized gypsum, daim ntawv no sim lub sijhawm teeb tsa, lub zog flexural thiab lub zog Compressive, los kawm txog cov yam ntxwv cuam tshuam rau kev ua haujlwm ntawm lub teeb plastering desulfurization gypsum mortar, thiab muab lub hauv paus theoretical rau kev txhim kho lub teeb plastering desulfurization gypsum mortar.
1 qhov kev sim
1.1 Cov khoom siv raw
Hmoov gypsum Desulfurization: Hemihydrate gypsum tsim thiab calcined los ntawm flue gas desulfurization technology, nws cov khoom yooj yim tau qhia hauv Rooj 1. Cov khoom sib xyaw ua ke sib dua: siv cov microbeads vitrified, thiab nws cov khoom yooj yim tau qhia hauv Rooj 2. Cov microbeads vitrified tau sib xyaw ua ke hauv qhov sib piv ntawm 4%, 8%, 12%, thiab 16% raws li qhov sib piv ntawm cov khoom sib xyaw ua ke desulfurized gypsum mortar.
Tshuaj Tiv Thaiv: Siv sodium citrate, tshuaj ntsuam xyuas tshuaj lom neeg ntshiab, sodium citrate yog raws li qhov hnyav piv ntawm lub teeb plastering desulfurization gypsum mortar, thiab qhov sib xyaw piv yog 0, 0.1%, 0.2%, 0.3%.
Cellulose ether: siv hydroxypropyl methylcellulose (HPMC), viscosity yog 400, HPMC yog raws li qhov hnyav piv ntawm lub teeb plastered desulfurized gypsum mortar, thiab qhov sib xyaw piv yog 0, 0.1%, 0.2%, 0.4%.
1.2 Txoj kev sim
Cov dej siv thiab lub sijhawm teeb tsa ntawm tus qauv sib xws ntawm desulfurized gypsum xa mus rau GB / T17669.4-1999 "Kev Txiav Txim Siab ntawm Cov Khoom Siv Lub Cev ntawm Lub Tsev Gypsum Plaster", thiab lub sijhawm teeb tsa ntawm lub teeb plastering desulfurized gypsum mortar xa mus rau GB / T 28627-2012 "Plastering Gypsum" yog ua tiav.
Lub zog flexural thiab compressive ntawm desulfurized gypsum raug ua raws li GB/T9776-2008 "Building Gypsum", thiab cov qauv nrog qhov loj me ntawm 40mm × 40mm × 160mm raug pwm, thiab lub zog 2h thiab lub zog qhuav raug ntsuas raws li. Lub zog flexural thiab compressive ntawm lub teeb-weight plastered desulfurized gypsum mortar yog ua raws li GB/T 28627-2012 "Plastering Gypsum", thiab lub zog ntawm kev kho ntuj rau 1d thiab 28d raug ntsuas raws li.
2 Cov txiaj ntsig thiab kev sib tham
2.1 Cov nyhuv ntawm cov hmoov gypsum rau ntawm cov khoom siv kho tshuab ntawm cov khoom siv desulfurization gypsum sib dua
Tag nrho cov hmoov gypsum, hmoov limestone thiab cov khoom sib xyaw ua ke yog 100%, thiab cov khoom sib xyaw ua ke thiab cov khoom sib xyaw ua ke tseem tsis hloov pauv. Thaum cov hmoov gypsum yog 60%, 70%, 80%, thiab 90%, qhov desulfurization yog cov txiaj ntsig ntawm lub zog flexural thiab compressive ntawm gypsum mortar.
Lub zog flexural thiab lub zog compressive ntawm lub teeb plastered desulfurized gypsum mortar ob qho tib si nce ntxiv raws li hnub nyoog, qhia tias qib hydration ntawm gypsum ua ntau txaus raws li hnub nyoog. Nrog rau kev nce ntawm desulfurized hmoov gypsum, lub zog flexural thiab lub zog compressive ntawm lub teeb plastering gypsum tau qhia txog kev nce siab tag nrho, tab sis qhov nce me me, thiab lub zog compressive ntawm 28 hnub tau pom tseeb tshwj xeeb. Thaum lub hnub nyoog 1d, lub zog flexural ntawm gypsum hmoov sib xyaw nrog 90% nce 10.3% piv rau ntawm 60% hmoov gypsum, thiab lub zog compressive sib xws nce 10.1%. Thaum muaj hnub nyoog 28 hnub, lub zog flexural ntawm gypsum hmoov sib xyaw nrog 90% nce 8.8% piv rau ntawm gypsum hmoov sib xyaw nrog 60%, thiab lub zog compressive sib xws nce 2.6%. Hauv kev xaus, nws tuaj yeem xaus lus tias qhov ntau ntawm gypsum hmoov muaj ntau qhov cuam tshuam rau lub zog flexural dua li lub zog compressive.
2.2 Cov nyhuv ntawm cov khoom sib xyaw ua ke sib dua rau cov khoom siv kho tshuab ntawm cov gypsum desulfurized plastered sib dua
Tag nrho cov hmoov gypsum, hmoov limestone thiab cov khoom sib xyaw ua ke yog 100%, thiab cov hmoov gypsum ruaj khov thiab cov khoom sib xyaw tseem tsis hloov pauv. Thaum cov microbeads vitrified yog 4%, 8%, 12%, thiab 16%, cov plaster sib xyaw ua ke qhia txog lub zog flexural thiab compressive ntawm desulfurized gypsum mortar.
Nyob rau tib lub hnub nyoog, lub zog flexural thiab lub zog compressive ntawm lub teeb plastered desulfurized gypsum mortar txo qis nrog rau kev nce ntawm cov ntsiab lus ntawm vitrified microbeads. Qhov no yog vim tias feem ntau ntawm cov vitrified microbeads muaj lub qauv hollow sab hauv thiab lawv tus kheej lub zog yog qis, uas txo qhov flexural thiab compressive zog ntawm lub teeb plastering gypsum mortar. Thaum muaj hnub nyoog 1d, lub zog flexural ntawm 16% gypsum hmoov tau txo los ntawm 35.3% piv nrog rau ntawm 4% gypsum hmoov, thiab lub zog compressive sib xws tau txo los ntawm 16.3%. Thaum muaj hnub nyoog 28 hnub, lub zog flexural ntawm 16% gypsum hmoov tau txo los ntawm 24.6% piv nrog rau ntawm 4% gypsum hmoov, thaum lub zog compressive sib xws tsuas yog txo los ntawm 6.0%. Hauv kev xaus, nws tuaj yeem xaus lus tias qhov cuam tshuam ntawm cov ntsiab lus ntawm vitrified microbeads ntawm lub zog flexural yog ntau dua li ntawm lub zog compressive.
2.3 Cov nyhuv ntawm cov ntsiab lus retarder rau kev teeb tsa lub sijhawm ntawm lub teeb plastered desulfurized gypsum
Tag nrho cov koob tshuaj ntawm cov hmoov gypsum, hmoov limestone thiab cov pob zeb sib xyaw ua ke yog 100%, thiab cov koob tshuaj ntawm cov hmoov gypsum ruaj khov, hmoov limestone, cov pob zeb sib xyaw ua ke thiab cellulose ether tseem tsis hloov pauv. Thaum cov koob tshuaj ntawm sodium citrate yog 0, 0.1%, 0.2%, 0.3%, cov txiaj ntsig ntawm lub sijhawm teeb tsa ntawm cov tshuaj gypsum desulfurized plastered sib xyaw.
Lub sijhawm teeb tsa thawj zaug thiab lub sijhawm teeb tsa zaum kawg ntawm cov gypsum mortar uas muaj cov tshuaj sodium citrate ntau ntxiv raws li qhov nce ntawm cov sodium citrate, tab sis qhov nce ntawm lub sijhawm teeb tsa me me. Thaum cov sodium citrate muaj 0.3%, lub sijhawm teeb tsa thawj zaug yuav ntev dua 28 feeb, thiab lub sijhawm teeb tsa zaum kawg yuav ntev dua 33 feeb. Qhov kev ncua sijhawm teeb tsa yuav yog vim thaj chaw loj ntawm cov gypsum desulfurized, uas tuaj yeem nqus cov tshuaj retarder nyob ib puag ncig cov gypsum me me, yog li txo qhov nrawm ntawm kev yaj ntawm gypsum thiab tiv thaiv kev crystallization ntawm gypsum, ua rau cov gypsum slurry tsis tuaj yeem tsim cov qauv ruaj khov. Ntev lub sijhawm teeb tsa ntawm gypsum.
2.4 Cov nyhuv ntawm cov ntsiab lus cellulose ether rau ntawm cov khoom siv kho tshuab ntawm cov khoom siv gypsum uas tsis hnyav thiab tsis muaj zog
Tag nrho cov koob tshuaj ntawm cov hmoov gypsum, hmoov limestone thiab cov pob zeb sib xyaw ua ke yog 100%, thiab cov koob tshuaj ntawm cov hmoov gypsum ruaj khov, hmoov limestone, cov pob zeb sib xyaw ua ke thiab cov tshuaj tiv thaiv tseem tsis hloov pauv. Thaum cov koob tshuaj ntawm hydroxypropyl methylcellulose yog 0, 0.1%, 0.2% thiab 0.4%, qhov tshwm sim ntawm lub zog flexural thiab compressive ntawm cov gypsum mortar desulfurized sib xyaw ua ke.
Thaum muaj hnub nyoog 1d, lub zog flexural ntawm lub teeb plastered desulfurized gypsum mortar thawj zaug nce thiab tom qab ntawd txo qis nrog kev nce ntawm hydroxypropyl methylcellulose cov ntsiab lus; thaum muaj hnub nyoog 28d, lub zog flexural ntawm lub teeb plastered desulfurized gypsum mortar Nrog kev nce ntawm cov ntsiab lus ntawm hydroxypropyl methylcellulose, lub zog flexural tau qhia txog qhov sib txawv ntawm thawj zaug txo qis, tom qab ntawd nce thiab tom qab ntawd txo qis. Thaum cov ntsiab lus ntawm hydroxypropyl methylcellulose yog 0.2%, lub zog flexural ncav cuag qhov siab tshaj plaws, thiab tshaj qhov sib xws lub zog thaum cov ntsiab lus ntawm cellulose yog 0. Txawm hais tias muaj hnub nyoog 1d lossis 28d, lub zog compressive ntawm lub teeb plastered desulfurized gypsum mortar txo qis nrog kev nce ntawm hydroxypropyl methylcellulose cov ntsiab lus, thiab qhov sib xws poob qis yog qhov pom tseeb dua ntawm 28d. Qhov no yog vim tias cellulose ether muaj cov nyhuv ntawm kev khaws cia dej thiab thickening, thiab qhov kev thov dej rau qhov sib xws yuav nce ntxiv nrog rau qhov nce ntawm cellulose ether cov ntsiab lus, ua rau muaj kev nce ntxiv ntawm cov dej-cement piv ntawm cov qauv slurry, yog li txo qhov muaj zog ntawm cov qauv gypsum.
3 Xaus Lus
(1) Qhov degree hydration ntawm desulfurized gypsum ua rau txaus nrog lub hnub nyoog. Nrog rau kev nce ntxiv ntawm cov hmoov desulfurized gypsum, lub zog flexural thiab compressive ntawm lub teeb plastering gypsum tau qhia txog kev nce siab tag nrho, tab sis qhov nce me me.
(2) Nrog rau qhov nce ntawm cov ntsiab lus ntawm vitrified microbeads, lub zog flexural thiab compressive zog ntawm lub teeb-hnyav plastered desulfurized gypsum mortar txo qis raws li, tab sis cov nyhuv ntawm cov ntsiab lus ntawm vitrified microbeads ntawm lub zog flexural yog ntau dua li ntawm compressive zog lub zog.
(3) Nrog rau kev nce ntxiv ntawm cov ntsiab lus sodium citrate, lub sijhawm teeb tsa thawj zaug thiab lub sijhawm teeb tsa zaum kawg ntawm lub teeb plastered desulfurized gypsum mortar tau ntev, tab sis thaum cov ntsiab lus ntawm sodium citrate me me, qhov cuam tshuam rau lub sijhawm teeb tsa tsis pom tseeb.
(4) Nrog rau kev nce ntawm hydroxypropyl methylcellulose cov ntsiab lus, lub zog compressive ntawm lub teeb plastered desulfurized gypsum mortar txo qis, tab sis lub zog flexural qhia txog qhov sib txawv ntawm thawj zaug nce thiab tom qab ntawd txo qis ntawm 1d, thiab ntawm 28d Nws tau qhia txog qhov sib txawv ntawm kev txo qis ua ntej, tom qab ntawd nce thiab tom qab ntawd txo qis.
Lub sijhawm tshaj tawm: Lub Ob Hlis-02-2023