Desulfurization gypsum yog ib qho kev lag luam los ntawm cov khoom gypsum tau los ntawm desulfurizing thiab purifying cov roj flue ua tom qab combustion ntawm sulfur-muaj roj los ntawm nplua txiv qaub los yog limestone hmoov slurry. Nws cov tshuaj muaj pes tsawg leeg yog tib yam li ntawm ntuj dihydrate gypsum, feem ntau CaSO4·2H2O. Tam sim no, kuv lub teb chaws txoj kev tsim hluav taws xob tseem tseem muaj zog los ntawm cov thee hluav taws xob tsim hluav taws xob, thiab SO2 emissions los ntawm thee hauv cov txheej txheem ntawm kev tsim hluav taws xob thermal tso nyiaj ntau dua 50% ntawm kuv lub teb chaws txhua xyoo emissions. Ib qho loj ntawm sulfur dioxide emission tau ua rau muaj kuab paug ib puag ncig loj. Kev siv cov tshuab hluav taws xob desulfurization los tsim cov desulfurized gypsum yog ib qho kev ntsuas tseem ceeb los daws cov kev tsim kho thev naus laus zis ntawm cov thee hluav taws xob ntsig txog kev lag luam. Raws li kev txheeb cais tsis tiav, emission ntawm ntub dej desulfurized gypsum nyob rau hauv kuv lub teb chaws tau tshaj 90 lab t / a, thiab cov txheej txheem ntawm desulfurized gypsum yog feem ntau piled, uas tsis tsuas occupies av, tab sis kuj ua rau ib tug loj loj pov tseg ntawm cov peev txheej.
Gypsum muaj lub luag haujlwm ntawm lub teeb yuag, txo suab nrov, tiv thaiv hluav taws, thermal rwb thaiv tsev, thiab lwm yam. Nws tuaj yeem siv rau hauv cov cement ntau lawm, tsim gypsum ntau lawm, kho kom zoo nkauj engineering thiab lwm yam. Tam sim no, ntau tus kws tshawb fawb tau tshawb fawb txog plastering plaster. Kev tshawb fawb qhia tau hais tias plastering plastering khoom muaj micro-expansion, zoo workability thiab plasticity, thiab tuaj yeem hloov cov ntaub ntawv plastering rau sab hauv tsev kho kom zoo nkauj. Kev tshawb fawb los ntawm Xu Jianjun thiab lwm tus tau pom tias desulfurized gypsum tuaj yeem siv los ua cov khoom siv phab ntsa. Kev tshawb fawb los ntawm Ye Beihong thiab lwm tus tau pom tias plastering gypsum ua los ntawm desulfurized gypsum tuaj yeem siv rau txheej plastering ntawm sab hauv ntawm phab ntsa, sab hauv phab ntsa thiab qab nthab, thiab tuaj yeem daws cov teeb meem zoo xws li plhaub thiab tawg ntawm cov tsoos plastering mortar. Lub teeb yuag plastering gypsum yog ib hom tshiab ntawm ib puag ncig tus phooj ywg plastering khoom. Nws yog ua los ntawm hemihydrate gypsum ua cov khoom siv cementitious tseem ceeb los ntawm kev ntxiv cov khoom sib xyaw ua ke thiab cov khoom sib xyaw. Piv nrog rau cov khoom siv cement plastering, nws tsis yooj yim rau tawg, lo zoo khi, zoo shrinkage, ntsuab thiab ib puag ncig tiv thaiv. Kev siv desulfurized gypsum los tsim hemihydrate gypsum tsis tsuas yog daws qhov teeb meem ntawm qhov tsis muaj kev tsim vaj tsev gypsum xwb, tab sis kuj paub txog kev siv cov khoom siv desulfurized gypsum thiab ua tiav lub hom phiaj ntawm kev tiv thaiv ib puag ncig ecological. Yog li ntawd, raws li txoj kev tshawb fawb ntawm desulfurized gypsum, daim ntawv no sim lub sij hawm teem, flexural zog thiab Compressive lub zog, los kawm txog cov yam uas cuam tshuam rau kev ua tau zoo ntawm lub teeb yuag plastering desulfurization gypsum mortar, thiab muab ib tug theoretical hauv paus rau txoj kev loj hlob ntawm lub teeb yuag plastering desulfurization gypsum mortar.
1 kev sim
1.1 Cov khoom siv raw
Desulfurization gypsum hmoov: Hemihydrate gypsum tsim thiab calcined los ntawm flue roj desulfurization tshuab, nws cov yam ntxwv yooj yim tau qhia nyob rau hauv Table 1. Lub teeb yuag aggregate: vitrified microbeads yog siv, thiab nws cov yam ntxwv tseem ceeb tau qhia nyob rau hauv Table 2. Vitrified microbeads yog tov nyob rau hauv proportions ntawm 4%, 8%, 1% 12% huab hwm coj piv ntawm plaster. desulfurized gypsum mortar.
Retarder: Siv sodium citrate, tshuaj ntsuam xyuas cov ntshiab reagent, sodium citrate yog raws li qhov hnyav piv ntawm lub teeb plastering desulfurization gypsum mortar, thiab qhov sib xyaw 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 yog 0, 0.1%, 0.2%, 0.4%.
1.2 Test method
Kev siv dej thiab teeb tsa lub sij hawm ntawm tus qauv sib xws ntawm desulfurized gypsum xa mus rau GB / T17669.4-1999 "Kev txiav txim siab ntawm lub cev ntawm lub tsev Gypsum Plaster", thiab lub sijhawm teeb tsa ntawm lub teeb plastering desulfurized gypsum mortar hais txog GB / T 28627-2012 Gypsum
Lub zog flexural thiab compressive ntawm desulfurized gypsum yog ua raws li GB / T9776-2008 "Lub Tsev Gypsum", thiab cov qauv nrog qhov loj ntawm 40mm × 40mm × 160mm yog molded, thiab 2h lub zog thiab qhuav lub zog yog ntsuas raws. Lub zog flexural thiab compressive ntawm lub teeb-hnyav plastered desulfurized gypsum mortar yog nqa tawm raws li GB / T 28627-2012 "Plastering Gypsum", thiab lub zog ntawm ntuj curing rau 1d thiab 28d yog ntsuas raws.
2 Cov txiaj ntsig thiab kev sib tham
2.1 Cov nyhuv ntawm gypsum hmoov cov ntsiab lus ntawm cov khoom siv ntawm lub teeb yuag plastering desulfurization gypsum
Tag nrho cov nyiaj ntawm gypsum hmoov, limestone hmoov thiab lub teeb yuag tag nrho yog 100%, thiab tus nqi ntawm lub teeb aggregate thiab admixture tseem tsis hloov. Thaum tus nqi ntawm gypsum hmoov yog 60%, 70%, 80%, thiab 90%, desulfurization Cov txiaj ntsig ntawm flexural thiab compressive zog ntawm gypsum mortar.
Lub zog flexural thiab compressive zog ntawm lub teeb plastered desulfurized gypsum mortar ob qho tib si nce nrog hnub nyoog, qhia tau hais tias cov hydration degree ntawm gypsum ua ntau txaus nrog lub hnub nyoog. Nrog rau qhov nce ntawm desulfurized gypsum hmoov, lub zog flexural thiab compressive zog ntawm lub teeb yuag plastering gypsum pom ib tug tag nrho upward trend, tab sis qhov nce yog me me, thiab lub zog compressive ntawm 28 hnub yog tshwj xeeb tshaj yog pom tseeb. Thaum lub hnub nyoog 1d, lub zog flexural ntawm gypsum hmoov sib xyaw nrog 90% nce los ntawm 10.3% piv nrog rau ntawm 60% gypsum hmoov, thiab qhov sib thooj compressive zog nce los ntawm 10.1%. Thaum muaj hnub nyoog 28 hnub, lub zog flexural ntawm gypsum hmoov sib xyaw nrog 90% nce los ntawm 8.8% piv nrog cov gypsum hmoov sib xyaw nrog 60%, thiab qhov sib txuam compressive zog nce los ntawm 2.6%. Txhawm rau ua kom tiav, nws tuaj yeem txiav txim siab tias tus nqi ntawm gypsum hmoov muaj txiaj ntsig ntau dua rau lub zog flexural dua li lub zog compressive.
2.2 Cov nyhuv ntawm lub teeb yuag aggregate cov ntsiab lus ntawm cov khoom siv ntawm lub teeb yuag plastered desulfurized gypsum
Tag nrho cov nyiaj ntawm gypsum hmoov, limestone hmoov thiab lub teeb yuag tag nrho yog 100%, thiab tus nqi ntawm cov gypsum ruaj khov thiab cov khoom siv tseem tsis hloov pauv. Thaum tus nqi ntawm vitrified microbeads yog 4%, 8%, 12%, thiab 16%, lub teeb plaster tshwm sim ntawm flexural thiab compressive zog ntawm desulfurized gypsum mortar.
Nyob rau tib lub hnub nyoog, lub zog flexural thiab compressive lub zog ntawm lub teeb plastered desulfurized gypsum mortar txo qis nrog qhov nce ntawm cov ntsiab lus ntawm vitrified microbeads. Qhov no yog vim hais tias feem ntau ntawm cov vitrified microbeads muaj ib tug hollow qauv nyob rau hauv thiab lawv tus kheej lub zog yog tsawg, uas yuav txo tau lub flexural thiab compressive zog ntawm lub lightweight plastering gypsum mortar. Thaum muaj hnub nyoog 1d, lub zog flexural ntawm 16% gypsum hmoov raug txo los ntawm 35.3% piv nrog 4% gypsum hmoov, thiab cov sib thooj compressive zog raug txo los ntawm 16.3%. Thaum muaj hnub nyoog 28 hnub, lub zog flexural ntawm 16% gypsum hmoov raug txo los ntawm 24.6% piv nrog 4% gypsum hmoov, thaum lub zog sib xyaw ua ke tsuas yog txo los ntawm 6.0%. Txhawm rau ua kom tiav, nws tuaj yeem txiav txim siab tias cov ntsiab lus ntawm vitrified microbeads ntawm lub zog flexural yog ntau dua li ntawm lub zog compressive.
2.3 Qhov cuam tshuam ntawm cov ntsiab lus retarder ntawm kev teeb tsa lub teeb ci plastered desulfurized gypsum
Tag nrho cov tshuaj gypsum hmoov, limestone hmoov thiab lub teeb yuag aggregate yog 100%, thiab qhov ntau npaum li cas ntawm gypsum hmoov, limestone hmoov, lub teeb yuag aggregate thiab cellulose ether tseem tsis hloov. Thaum cov tshuaj sodium citrate yog 0, 0.1%, 0.2%, 0.3%, teem sij hawm tshwm sim ntawm lub teeb plastered desulfurized gypsum mortar.
Lub sijhawm teeb tsa thawj zaug thiab lub sijhawm kawg ntawm lub teeb plastered desulfurized gypsum mortar ob qho tib si nce nrog kev nce ntawm sodium citrate cov ntsiab lus, tab sis qhov nce ntawm lub sij hawm teem me me. Thaum cov ntsiab lus sodium citrate yog 0.3%, lub sij hawm pib lub sij hawm ncua 28min, thiab lub sij hawm zaum kawg tau ncua ntev li 33min. Lub sijhawm ntev ntawm lub sijhawm teeb tsa yuav yog vim qhov loj ntawm thaj tsam ntawm desulfurized gypsum, uas tuaj yeem nqus cov retarder nyob ib ncig ntawm gypsum hais, yog li txo qhov kev sib cais ntawm gypsum thiab inhibiting crystallization ntawm gypsum, uas ua rau lub cev tsis muaj peev xwm ntawm gypsum slurry los tsim kom muaj kev ruaj ntseg. Ntev lub sij hawm teem ntawm gypsum.
2.4 Cov nyhuv ntawm cellulose ether cov ntsiab lus ntawm cov khoom siv ntawm lub teeb yuag plastered desulfurized gypsum
Tag nrho cov tshuaj gypsum hmoov, limestone hmoov thiab lub teeb yuag tag nrho yog 100%, thiab qhov ntau npaum li cas ntawm gypsum hmoov, limestone hmoov, lub teeb yuag aggregate thiab retarder tseem tsis hloov. Thaum qhov ntau npaum ntawm hydroxypropyl methylcellulose yog 0, 0.1%, 0.2% thiab 0.4%, flexural thiab compressive lub zog tshwm sim ntawm lub teeb plastered desulfurized gypsum mortar.
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 qhov 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 pom ib qho kev sib piv ntawm thawj qhov txo qis, tom qab ntawd nce thiab txo qis. Thaum cov ntsiab lus ntawm hydroxypropyl methylcellulose yog 0.2%, lub zog flexural nce mus txog qhov siab tshaj plaws, thiab tshaj qhov sib thooj 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 qhov nce ntawm cov ntsiab lus hydroxypropyl propylresyl cortar. yog pom tseeb ntawm 28d. Qhov no yog vim hais tias cellulose ether muaj cov nyhuv ntawm cov dej tuav thiab thickening, thiab cov dej thov rau tus qauv sib xws yuav nce nrog nce ntawm cellulose ether cov ntsiab lus, uas ua rau muaj kev nce hauv dej-cement piv ntawm slurry qauv, yog li txo lub zog ntawm gypsum specimen.
3 Kev xaus
(1) Lub hydration degree ntawm desulfurized gypsum ua ntau txaus nrog lub hnub nyoog. Nrog rau qhov nce ntawm desulfurized gypsum hmoov cov ntsiab lus, lub flexural thiab compressive zog ntawm lub teeb yuag plastering gypsum pom ib tug tag nrho upward sib, tab sis qhov nce yog me me.
(2) Nrog rau qhov nce ntawm cov ntsiab lus ntawm vitrified microbeads, lub zog flexural thiab compressive zog ntawm lub teeb yuag 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 lub zog compressive zog.
(3) Nrog rau qhov nce ntawm sodium citrate cov ntsiab lus, qhov pib teeb tsa lub sij hawm thiab lub sij hawm zaum kawg ntawm lub teeb plastered desulfurized gypsum mortar yog ntev, tab sis thaum cov ntsiab lus ntawm sodium citrate me me, cov nyhuv ntawm kev teeb tsa lub sij hawm tsis pom tseeb.
(4) Nrog rau qhov nce ntawm hydroxypropyl methylcellulose cov ntsiab lus, lub zog compressive ntawm lub teeb plastered desulfurized gypsum mortar txo, tab sis lub zog flexural qhia tau hais tias tus qauv ntawm thawj zaug nce thiab tom qab ntawd txo qis ntawm 1d, thiab ntawm 28d Nws pom qhov sib txawv ntawm kev txo qis ua ntej, tom qab ntawd nce thiab txo qis.
Post lub sij hawm: Feb-02-2023