Desulfurization gypsum bụ flue gas na-emepụta site na combustion nke sọlfọ-nwere mmanụ ụgbọala (coal, mmanụ ala), ụlọ ọrụ siri ike mkpofu na-emepụta n'oge desulfurization ọcha usoro, na hemihydrate gypsum (chemical usoro CaSO4 · 0.5H2O), arụmọrụ bụ tụnyere nke ahụ. nke eke ewu gypsum. Ya mere, a na-enwewanye nyocha na ngwa nke iji gypsum desulfurized kama gypsum eke na-emepụta ihe na-edozi onwe ya. Ngwakọta polymer Organic dị ka onye na-ebelata mmiri, onye na-ejigide mmiri na retarder bụ ihe dị mkpa na-arụ ọrụ na nhazi nke ngwa ngwa na-eme onwe ya. Mmekọrịta na usoro nke abụọ na ihe cimentious bụ okwu kwesịrị nlebara anya otu. N'ihi njirimara nke usoro nhazi ahụ, ịdị mma nke gypsum desulfurized dị ntakịrị (nke a na-ekesa nke ọma n'etiti 40 na 60 μm), na gradation ntụ ntụ bụ ihe ezi uche na-adịghị na ya, n'ihi ya, njirimara rheological nke gypsum desulfurized adịghị mma, na ngwa agha. slurry kwadebere ya na-adịkarị mfe ikewapụ, stratification na ọbara ọgbụgba eme. Cellulose ether bụ ihe a na-ejikarị eme ihe na ngwa agha, yana ijikọ ya na onye na-ebelata mmiri bụ ihe dị mkpa na-ekwe nkwa iji ghọta arụmọrụ zuru oke nke ihe na-eme ka gypsum na-edozi onwe ya dị ka ịrụ ọrụ ihe owuwu na mgbe e mesịrị na-arụ ọrụ na ịdịte aka.
N'ime akwụkwọ a, a na-eji uru mmiri mmiri dị ka akara nchịkwa (na-agbasa ogo 145 mm± 5 mm), na-elekwasị anya na mmetụta nke ọdịnaya nke cellulose ether na molecular arọ (viscosity value) na mmiri oriri nke desulfurized gypsum dabeere onwe ya. -ọkwa ihe, ọnwụ nke fluidity ka oge na-aga, na coagulation Iwu nke mmetụta nke isi ihe dị ka oge na mmalite n'ibu Njirimara; N'otu oge ahụ, nwalee iwu nke mmetụta nke cellulose ether na okpomọkụ ntọhapụ na okpomọkụ ntọhapụ ọnụego nke desulfurized gypsum hydration, nyochaa mmetụta ya na hydration usoro nke desulfurized gypsum, na ibido na-atụle ụdị admixture ndakọrịta na desulfurization gypsum gelling usoro. .
1. Ngwa ngwa na ụzọ ule
1.1 Akụrụngwa
Gypsum ntụ ntụ: desulfurized gypsum ntụ ntụ nke ụlọ ọrụ dị na Tangshan mepụtara, ihe mejupụtara ihe mejupụtara ya bụ hemihydrate gypsum, ihe mejupụtara kemịkal ya gosipụtara na tebụl 1, yana ihe ndị mejupụtara ya gosipụtara na tebụl 2.
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Admixtures gụnyere: cellulose ether (hydroxypropyl methylcellulose, HPMC maka mkpụmkpụ); superplasticizer WR; defoamer B-1; EVA redispersible latex powder S-05, ha niile dị na azụmaahịa.
Mkpokọta: ájá osimiri eke, ezigbo aja nke ejiri aka ya sie sieve 0.6 mm.
1.2 Usoro ule
Desulfurization gypsum a kapachara: ájá: mmiri = 1: 0.5: 0.45, ego kwesịrị ekwesị nke admixtures ndị ọzọ, fluidity dị ka akara njikwa (mgbasawanye 145 mm ± 5 mm), site n'ịgbanwe oriri mmiri, n'otu n'otu na-ejikọta ya na ihe ndị na-esi ísì ụtọ (desulfurization gypsum + ciment). ) 0, 0.5‰, 1.0‰, 2.0‰, 3.0 ‰ cellulose ether (HPMC-20,000); n'ihu idozi usoro onunu ogwu nke cellulose ether ka 1 ‰, họrọ HPMC-20,000, HPMC-40,000 , HPMC-75,000, na HPMC-100,000 hydroxypropyl methylcellulose ethers dị iche iche molekụla weights (kwekọrọ ọnụ ọgụgụ bụ H2, .5, H4 na H70. ), ịmụ usoro onunu ogwu na molekụla arọ (uru viscosity) nke cellulose ether mmetụta nke mgbanwe na Njirimara nke gypsum dabeere onwe-leveling ngwa agha, na mmetụta nke abụọ na fluidity, mwube oge na mmalite n'ibu Njirimara nke desulfurized gypsum onwe-leveling ngwa agha. ngwakọta na-atụle. A na-eme usoro nnwale a kapịrị ọnụ dabere n'ihe achọrọ GB/T 17669.3-1999 “Mkpebi nke Mechanical Properties of Building Gypsum”.
A na-eme nyocha okpomọkụ nke hydration site na iji ihe nlele oghere nke gypsum desulfurized na ihe atụ nwere ọdịnaya ether cellulose nke 0.5 ‰ na 3‰, n'otu n'otu, na ihe eji eme ihe bụ TA-AIR ụdị okpomọkụ nke hydration tester.
2. Nsonaazụ na nyocha
2.1 Mmetụta nke cellulose ether ọdịnaya na isi Njirimara nke ngwa agha
Site na mmụba nke ọdịnaya, arụ ọrụ na njikọta nke ngwa agha na-abawanye nke ọma, mfu nke mmiri na-aga n'ihu na-ebelata nke ukwuu, na arụmọrụ ihe owuwu ahụ dị oke mma, na ngwa agha siri ike enweghị ihe ọ bụla delamination, na ire ụtọ dị elu. ire ụtọ na Aesthetics ka emelitere nke ukwuu. N'otu oge ahụ, oriri mmiri nke ngwa agha iji nweta otu mmiri ahụ mụbara nke ukwuu. Na 5 ‰, oriri mmiri na-abawanye site na 102%, na oge nhazi ikpeazụ na-agbatị 100 min, nke bụ 2.5 ugboro nke ihe nlele efu. Njirimara ngwa ngwa mbụ nke ngwa agha belatara nke ukwuu site na mmụba nke ọdịnaya cellulose ether. Mgbe ọdịnaya nke cellulose ether bụ 5 ‰, 24 h ike mgbanwe na ike mkpakọ gbadara ruo 18.75% na 11.29% nke oghere oghere n'otu n'otu. Ike mkpakọ bụ 39.47% na 23.45% nke oghere oghere n'otu n'otu. Ọ dị mma ịmara na na mmụba nke ọnụ ọgụgụ nke onye na-ejigide mmiri, nnukwu njupụta nke ngwa agha belatara nke ukwuu, site na 2069 kg / m3 na 0 ruo 1747 kg / m3 na 5 ‰, mbelata nke 15.56%. Njupụta nke ngwa agha ahụ na-ebelata na porosity na-abawanye, nke bụ otu n'ime ihe kpatara mbelata doro anya na akụrụngwa akụrụngwa nke ngwa agha ahụ.
Cellulose ether bụ polymer na-abụghị ionic. Otu hydroxyl dị na cellulose ether chain na oxygen atom na ether bond nwere ike ijikọta ya na mmiri mmiri na-emepụta njikọ hydrogen, na-atụgharị mmiri efu n'ime mmiri agbụ, si otú ahụ na-ekere òkè na njide mmiri. Macroscopically Ọ na-egosipụta dị ka mmụba nke ịdị n'otu nke slurry [5]. Mmụba nke viscosity slurry ọ bụghị naanị na-abawanye oriri mmiri, kamakwa ether cellulose gbazere ga-adaba n'elu ihe ndị gypsum, na-egbochi mmeghachi omume hydration na ịgbatị oge ntọala; n'oge usoro mkpali, a ga-ewebatakwa ọnụ ọgụgụ buru ibu nke ikuku. Voids ga-etolite ka ngwa ngwa na-esi ike, mechaa belata ike nke ngwa agha ahụ. Comprehensively na-atụle unilateral mmiri oriri nke ngwa agha ngwakọta, ewu arụmọrụ, mwube oge na n'ibu Njirimara, na mgbe e mesịrị anwụ ngwa ngwa, wdg, ọdịnaya nke cellulose ether na desulfurized gypsum dabeere onwe-leveling ngwa agha ekwesịghị gafere 1‰.
2.2 Mmetụta nke ịdị arọ nke cellulose ether na arụ ọrụ nke ngwa agha
Ọtụtụ mgbe, ka viscosity dị elu na ịdị mma nke cellulose ether dị mma, ka mma na-ejigide mmiri ma na-abawanye ike njikọ. a ga-emetụta arụmọrụ na-adịghị mma. Ya mere, a nwalekwuru mmetụta nke cellulose ethers nke dị iche iche molekụla ihe dị iche iche na ihe ndị bụ isi nke gypsum na-adabere na ngwa ngwa na-edozi onwe ya. Ọchịchọ mmiri nke ngwa agha ahụ mụbara ruo n'ókè ụfọdụ, mana enweghị mmetụta doro anya na nhazi oge na mmiri. N'otu oge ahụ, ike mgbanwe na mkpakọ nke ngwa agha na steeti dị iche iche na-egosi ọnọdụ dị ala, mana ọdịda ahụ dị ntakịrị karịa mmetụta nke cellulose ether ọdịnaya na ihe eji arụ ọrụ. Na nchịkọta, mmụba nke ịdị arọ nke cellulose ether enweghị mmetụta doro anya na arụmọrụ nke ngwakọta ngwa agha. N'ịtụle ịdị mma nke ihe owuwu, obere viscosity na obere cellulose ether nke dị arọ kwesịrị ịhọrọ dị ka ihe na-eme ka gypsum na-edozi onwe ya.
2.3 Mmetụta nke cellulose ether na okpomọkụ nke hydration nke gypsum desulfurized
Na mmụba nke ọdịnaya nke cellulose ether, exothermic ọnụ ọgụgụ kasị elu nke hydration nke desulfurized gypsum ji nwayọọ nwayọọ na-ebelata, na oge nke ọnụ ọgụgụ kasị elu na-egbu oge, mgbe exothermic okpomọkụ nke hydration belatara, ma ọ bụghị doro anya. Nke a na-egosi na cellulose ether nwere ike igbu oge hydration ọnụego na hydration ogo nke gypsum desulfurized ruo n'ókè ụfọdụ, n'ihi ya, usoro onunu ogwu ekwesịghị ịbụ nke ukwuu, na kwesịrị ịchịkwa n'ime 1 ‰. Enwere ike ịhụ na ihe nkiri colloidal nke e guzobere mgbe cellulose ether zutere mmiri na-adsorbed n'elu nke gypsum gypsum desulfurized, nke na-ebelata hydration nke gypsum tupu 2 h. N'otu oge ahụ, njigide mmiri ya pụrụ iche na mmetụta na-egbu egbu na-egbu oge ikpochapụ nke mmiri slurry na Dissipation na-aba uru na hydration ọzọ nke gypsum desulfurized na-esote. N'ịchịkọta, mgbe a na-achịkwa usoro ọgwụgwọ kwesịrị ekwesị, cellulose ether nwere mmetụta dị nta na ọnụego hydration na ogo hydration nke gypsum desulfurized n'onwe ya. N'otu oge ahụ, mmụba nke cellulose ether ọdịnaya na molekụla dị arọ ga-eme ka viscosity nke slurry dịkwuo ukwuu ma gosipụta ọrụ njigide mmiri dị mma. Iji hụ na mmiri mmiri nke gypsum desulfurized na-edobe onwe ya, oriri mmiri ga-abawanye nke ukwuu, nke bụ n'ihi ogologo oge nhazi nke ngwa agha ahụ. Isi ihe kpatara ọdịda akụrụngwa akụrụngwa.
3. Nkwubi okwu
(1) Mgbe a na-eji fluidity dị ka njikwa njikwa, yana mmụba nke ọdịnaya ether cellulose, oge nhazi nke gypsum na-edozi onwe ya na-agbatị ngwa ngwa, na-ebelata ihe ndị na-emepụta ihe; ma e jiri ya tụnyere ọdịnaya, ịdị arọ nke cellulose ether Mmụba na-enwe mmetụta dị nta na ihe ndị dị n'elu nke ngwa agha. N'ịtụle n'ụzọ zuru ezu, a ga-ahọrọ cellulose ether na obere ihe dị arọ (ọnụahịa viscosity dị ala karịa 20 000 Pa·s), a ga-ejikwa usoro ọgwụgwọ n'ime 1 ‰ nke ihe ciment.
(2) Nnwale ule nke hydration okpomọkụ nke gypsum desulfurized na-egosi na n'ime njedebe nke ule a, cellulose ether nwere oke mmetụta na ọnụego hydration na usoro hydration nke gypsum desulfurized. Mmụba nke oriri mmiri na mbelata nke njupụta buru ibu bụ isi ihe kpatara mbelata akụrụngwa akụrụngwa nke ngwa agha gypsum desulfurized desulfurized.
Oge nzipu: Mee-08-2023