Anhydrite yog ib qho anhydrous calcium sulfate nrog cov ntsiab lus ntawm CaSO4. Nws yog ze ze rau gypsum, uas muaj cov tshuaj muaj pes tsawg leeg ntawm CaSO4.2H2O. Lub ntiaj teb kev nplua mias ntawm gypsum zoo heev tshaj qhov abundance ntawm anhydrite.
Anhydrite yog ib qho evaporite ntxhia uas tshwm sim nyob rau hauv ntau txheej txheej deposits nyob rau hauv sedimentary bass qhov twg loj ntim ntawm dej hiav txwv tau evaporated. Nws yog feem ntau interbedded nrog halite, gypsum, thiab limestone nyob rau hauv commulations uas muaj peev xwm mus txog rau pua pua ntawm ko taw tuab. Ntawm qhov me me, anhydrite tuaj yeem tsim nyob rau hauv ntug dej hiav txwv lossis tidal ca sediments los ntawm evaporation ntawm dej hiav txwv.
Lub cev muaj zog
Ib qho tshwj xeeb tshaj plaws ntawm anhydrite yog nws qhov cubic cleavage. Nws cleaves nyob rau hauv peb txoj kev ntawm txoj cai kaum. Qhov no tuaj yeem pom tau yooj yim hauv cov qauv coarsely crystalline lossis nrog lub lens tes hauv cov qauv zoo. Qhov tshwj xeeb cleavage no tau txais anhydrite lub npe menyuam yaus ntawm "cube spar."
Synthesis
Hydrofluoric acid yog tsim los ntawm fluorite thiab sulfuric acid. Rau txhua tuj ntawm hydrofluoric acid tsim, kwv yees li 3 1/2 tons ntawm hluavtaws anhydrite yog tsim. Tau ntau xyoo no hluavtaws anhydrite tau suav tias yog ib qho khoom siv tsis zoo uas muaj cov nqi pov tseg. Txawm li cas los xij, tam sim no feem ntau ntawm nws tau qhuav hauv qhov cub thiab siv los ua cov khoom siv los ua cov cement, plaster, thiab flooring. Nws kuj yog siv los ua ib qho muab tub lim hauv kev tsim cov khoom yas thiab ntawv.
Siv
Anhydrite tuaj yeem hloov pauv rau gypsum hauv qee qhov ntawm nws siv. Ob qho tib si cov zaub mov yog crushed rau siv raws li kev kho av, thiab nyob rau hauv lub hom phiaj no anhydrite yog superior. Ib tuj ntawm anhydrite muaj calcium ntau tshaj ib tuj ntawm gypsum - vim gypsum yog li 21 feem pua dej los ntawm qhov hnyav. Qhov no yields calcium ntau dua ib tuj hauv daim ntawv thov av. Anhydrite kuj muaj ntau dua solubility, uas pab nws pab tau cov av sai.
Me me ntawm anhydrite yog siv los ua kom qhuav cov neeg ua haujlwm hauv plaster, xim, thiab kua roj vanish. Nws kuj tseem siv nrog gypsum los tsim plaster, sib koom ua ke, phab ntsa, thiab lwm yam khoom siv rau kev tsim kho kev lag luam. Anhydrite kuj tau siv los ua ib qhov chaw ntawm sulfur hauv kev tsim cov sulfuric acid.
