Muaj kev siv gypsum

Gypsum belongs rau monoclinic crystal system, siab cleavage degree, yooj yim rau phua rau hauv nyias slices, cua sov gypsum mus rau 100 ~ 200 degree, poob ib feem ntawm cov crystallizing dej, yuav tau txais ib nrab aqueous gypsum. Nws yog ib yam ntawm cov khoom siv roj-nyuaj cementite nrog thiab cov ntaub ntawv, ob qho tib si yog pob zeb diamond zoo li cov muaju, tab sis cov khoom sib txawv ntawm lub cev. -type hemihydrous gypsum yog zoo crystallized thiab khoom. Cov-type hemihydrous gypsum yog siv lead ua nrog flake thiab tawg, cov siv lead ua zoo heev, thiab thaj chaw tshwj xeeb yog loj dua li hom hemihydrous gypsum. Hauv kev tsim cov khoom lag luam gypsum, -type semi-aqueous gypsum yuav tsum muaj dej tsawg dua -hom gypsum, thiab cov khoom muaj ntau dua compactness thiab lub zog. Feem ntau siv autoclave hauv saturated chav nruab nrab yog hom semi-hydrous gypsum, tseem hu ua siab zog gypsum; Nws yog calcined los ntawm txhais tau tias ntawm ib tug wok los yog teb kiln qhib ntaus ntawv li beta hemihydrate gypsum, piv txwv li, tsev gypsum. Kev lag luam los ntawm cov khoom siv tshuaj gypsum muaj cov khoom zoo ib yam li ntuj gypsum thiab tsis tas yuav ua ntau yam. Lub slurry ntawm hemihydrate gypsum tov nrog dej tsim ib tug tshiab dihydrate gypsum, uas sai sai condenses thiab hardens nyob rau hauv cov txheej txheem ziab thiab nce lub zog, tab sis softenes nyob rau hauv kev sib cuag nrog dej. Gypsum yog cov khoom siv tseem ceeb rau kev tsim cov gypsum cementitious cov ntaub ntawv thiab cov khoom siv gypsum, nrog rau cov neeg sawv cev ntawm Portland cement. Tom qab calcining gypsum ntawm 600 ~ 800 degree, ntxiv me me ntawm catalyst xws li txiv qaub thiab sib tsoo ua ke, anhydrite binder (tseem hu ua Jin's binder) tuaj yeem tau. Calcined gypsum ntawm qhov kub thiab txias tuaj yeem tau txais los ntawm calcining thiab sib tsoo ntawm 900 ~ 1000 degree. Lub zog ntawm cov khoom ua los ntawm ob hom gypsum yog siab dua li ntawm cov khoom siv gypsum, thiab cov anhydrite binder muaj cov rwb thaiv tsev zoo dua, thiab kub kub calcined gypsum tau zoo dua hnav thiab dej tsis kam.