Calcium sulfate. piav qhia

Nyob rau hauv niaj hnub Inorganic Science News for KIDS tseem ceeb heev ntsev kev faib thiab thaj chaw ntawm kev sis raug zoo ntsiab thiab lawv tag nrho tau sib txuas. Muaj tshuaj uas, cov lwm leej lwm tus nyob ib tug tshwj xeeb qhov chaw. Tej tebchaw nyob rau hauv particular yuav tsum raug xa mus calcium sulfate. Formula tshuaj CaSO4.

Loj tso ntawm no compound nyob rau hauv lub kiav txhab cia nws siv raws li ib tug raw khoom nyob rau hauv qhov kev npaj ntawm ntau cov ntaub ntawv. Cov uas ua ntaub ntawv yuav tsum ntse siv nyob rau hauv kev tsim kho, tshuaj thiab lwm qhov chaw.

pom mineral deposits muaj ib tug muaj pes tsawg leeg ntawm CaSO4 2 H2O Nyob rau hauv tej yam ntuj tso tej yam kev mob. Calcium sulfate yog tseem pom nyob rau hauv lub hiav txwv (txog 1800 000 tonnes ib cubic Meter) thiab cov dej tshiab.

CaSO4 anhydride yog ib tug dawb hmoov ceev ntawm 2.90-2.99 grams ib nyhav centimeter. Tiabsis cov koom absorbs noo noo los ntawm cov huab cua. Vim hais tias ntawm cov cuab yeej no, thiab calcium sulfate siv raws li tus neeg saib xyuas kom qhuav.

Thaum kub txhiab plaub puas tsib caug degrees tshuaj melts thiab decomposes. Lub solubility ntawm lub yam khoom uas yog kho kom zoo nyob rau hauv lub xub ntiag ntawm HCl, HNO3, NaCl, MgCl2. Calcium sulfate reacts nrog lub sulfuric acid yog txo thaum sintering nrog carbon.

Ua nyob rau hauv dej ua ke nrog MgSO4 thiab MgCl2, CaSO4 rigidity muab nws tug tas mus li. Tshuaj softening kua yog tau nrog cov reagents. Yuav txo tau ntawm hardness ntawm cov dej raws li nyob rau hauv cov kev taw qhia ntawm tshuaj enriched nws anions.

Softening dej yog tseem nqa tawm los ntawm ion pauv. Qhov no yog raws li nyob rau hauv lub peev xwm ntawm tej cua thiab tej yam ntuj tso ion exchangers - high-molecular tebchaw - sib radicals muaj nyob rau hauv lawv cov muaj pes tsawg leeg, nyob rau hauv ions tam sim no nyob rau hauv cov tshuaj. Raws li ion exchangers feem ntau ua aluminosilicates (Na2 [Al2Si2O8] ∙ nH2O, piv txwv li).

Haus dej nrog lub muaj pes tsawg leeg 2CaSO4 H2O - Alabaster (burnt gypsum) - siv nyob rau hauv qhov siv thiab ua cementitious cov ntaub ntawv. Cov tshuaj sawv cev rau ib tug pulverulent tebchaw, ntawm uas thaum tov nrog dej ntaub ntawv yas thawj, thiab tom qab solidifying rau hauv ib lub khoom lub cev hnyav. Kev npaj txheej txheem yog nqa tawm nyob rau hauv alabaster gypsum calcination nyob rau hauv tus ntawm kub ntawm ib puas tsib caug rau ib puas xya caum degrees. Qhov no tej khoom vaj tse yog siv nyob rau hauv qhov siv thiab ua muab faib panels thiab laug cam, pwm khoom, raws li zoo raws li nyob rau hauv qhov kev siv ntawm plastering.

Calcination nyob rau hauv tus ntawm lub kub ntau tshaj ob puas degrees ua rau cov tsim ntawm tus soluble hauv daim ntawv ntawm calcium sulfate anhydrous, ntawm ib kub ntau dua tshaj li tsib puas degrees - insoluble daim ntawv. Cov yav tas loses nws muaj peev xwm muab cov dej yog li ntawd yuav siv tsis tau raws li ib tug phau ntawv.

Ntuj gypsum yuav siv tau raws li ib tug starting khoom nyob rau hauv qhov kev npaj ntawm MAAs thiab sulfuric acid los ntawm lub neej coj txoj kev.

Ntuj calcium sulphate kuj yuav siv tau raws li ib tug desiccant nyob rau hauv lub tsom xam ntawm cov organic tebchaw. Lub anhydrous compound yog tau nqus noo noo 6.6% ntawm tag nrho cov ceeb thawj. Calcium sulfate kuj yog siv nyob rau hauv qhov siv thiab ua insulating cov ntaub ntawv.