Prepararea aluminiului ...tpnlcrmtpnqctpnstart1tpnindent720tpnhang Itpntxtb SItpntxta SSIttpnseclvl8tpnlcltrtpnqctpnstart1tpnindent720tp nhang Itpntxtb SItpntxta SSIttpnseclvl9tpnlcrmtpnqctpnstart1tpnindent720tpn hang Itpntxtb SItpntxta SStpardtplain tltrpartqc tli0tri0tidctlpartnooverflotfaromantrin0tlin0titap 0 trtlchtfcs1 taf0tafs20talang1025 tltrchtfcs0 tf36tfs20tlang1033tlangfe1049tcgridtlangnp1033tlan gfenp1049 Itrtlchtfcs1 taf0 tltrchtfcs0 tbtf0tfs36tultlang1048tlangfe1049tlangnp1048tinsrs id8022498 AluminiuSItrtlchtfcs1 taf0 tltrchtfcs0 tbtf0tfs28tultlang1048tlangfe1049tlangnp1048tinsrs id8022498 tpar Stpard tltrpartql tli0tri0tidctlpartnooverflotfaromantrin0tlin0titap 0 Itrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 tpar ttab SItrtlchtfcs1 taf42 tltrchtfcs0 tbtf42tfs28tlang1048tlangfe1049tlangnp1048tinsrsid 8022498 Rte3spte2ndire teen naturte3SItrtlchtfcs1 taf42 tltrchtfcs0 tf42tfs28tlang1048tlangfe1049tlangnp1048tinsrsid80 22498 Al este cel mai rte3spte2ndit metal teen naturte3 el alcte3tuietbate 7,4 din scoartfea pte3mte2ntului. Al nu existte3 teen stare nativte3. Dintre mineralele mai importante sunt micele, feldspatfeii respectiv tbai produsele de alterare ale acestora caolinul tbai argila, corindonul tbai variette3tfeile lui, bauxita apoi criobitul.tpar SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 tpar ttab SItrtlchtfcs1 taf0 tltrchtfcs0 tbtf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid8 022498 PreparareSItrtlchtfcs1 taf42 tltrchtfcs0 tf42tfs28tlang1048tlangfe1049tlangnp1048tinsrsid80 22498 Fabricarea Al comportte3 doute3 etape a fabricarea oxidului de Altpar Stpard tltrpartql tfi-360tli360tri0tidctlparttx360tnooverflotfaroman trin0tlin360titap0 Itrtlchtfcs1 taf42 tltrchtfcs0 tf42tfs28tlang1048tlangfe1049tlangnp1048tinsrsid80 22498 ttab ttab ttab ttab ttab ttab ttab ttab ttab b obtfeinerea Al din aluminte3tpar Stpard tltrpartql tfi-720tli1080tri0tidctlpartnooverflotfaromantrin0 tlin1080titap0 Itrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 attab Al , mSItrtlchtfcs1 taf42 tltrchtfcs0 tf42tfs28tlang1048tlangfe1049tlangnp1048tinsrsid80 22498 ai ales acela destinat constructfeiilor de avioane nu trebuie ste3 contfeinte3 nici fier nici siliciu. De aceea cte2nd bauxitele contfein cantitte3tfei mai mari de fier tbai de siliciu, ele trebuie supuse unor tratamente prealabile de purificare.tpar Stpard tltrpartql tli1440tri0tidctlpartnooverflotfaromantrin0tlin144 0titap0 Itrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 Procedeul Bayer este unul dSItrtlchtfcs1 taf42 tltrchtfcs0 tf42tfs28tlang1048tlangfe1049tlangnp1048tinsrsid80 22498 intre cele mai rte3spte2ndite procedee pentru fabricarea aluminei din bauxite ste3race teen fier tbai siliciu. tcen acest procedeu, bauxita, teen prealabil calcinatte3 tbai mte3cinatte3, este tratatte3 cu hidroxid de sodiu, teen autoclave, la 4 tendash 6 at tbai 160 tendash 180 C. Oxidul de Al din bauxitte3 trece teen solutfeie sub formte3 de aluminat de sodiu NaiAlOHSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 4SItrtlchtfcs1 taf42 tltrchtfcs0 tf42tfs28tlang1048tlangfe1049tlangnp1048tinsrsid80 22498 s. Amestecul se filtreazte3, separte2ndu-se solutfeia de aluminat de sodiu de hidroxizii de fier tbai de combinatfeiile siliciului cu aluminatul de sodiu.tpar Stpard tltrpartql tli720tri0tidctlpartnooverflotfaromantrin0tlin720t itap0 Itrtlchtfcs1 taf42 tltrchtfcs0 tf42tfs28tlang1048tlangfe1049tlangnp1048tinsrsid80 22498 ttab tcen solutfeia cu aluminat de sodiu se introduce fie un curent de bioxid di carbon, cte2nd precipitte3 hidroxidul de Al.tpar SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 tpar 2NaiAlOHSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 4SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 s COSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 2 SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 2AlOHSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 3 SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 NaSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 2SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 COSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 3SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 HSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 2SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 Otpar tpar SItrtlchtfcs1 taf42 tltrchtfcs0 tf42tfs28tlang1048tlangfe1049tlangnp1048tinsrsid80 22498 fie cantitte3tfei mici de AlOHSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 3SItrtlchtfcs1 taf42 tltrchtfcs0 tf42tfs28tlang1048tlangfe1049tlangnp1048tinsrsid80 22498 care amorseazte3 desc aluminatului avte2nd rol de germen de cristalizare pentru separarea hidroxidului de Altpar SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 tpar NaiAlOHSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 4SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 s AlOHSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 3SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 NaOH tpar tpar SItrtlchtfcs1 taf42 tltrchtfcs0 tf42tfs28tlang1048tlangfe1049tlangnp1048tinsrsid80 22498 Hidroxidul de Aluminiu obtfeinut se calcineazte3 teen cuptoare rotative la 1200SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 0SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 C cte2nd trece teen oxid de Altpar tpar 2AlOHSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 3SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 AlSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 2SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 OSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 3SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 3HSItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs19tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 2SItrtlchtfcs1 taf0 tltrchtfcs0 tf0tfs28tlang1048tlangfe1049tlangnp1048tinsrsid802 2498 Otpar tpar SItrtlchtfcs1 taf42 tltrchtfcs0 tf42tfs28tlang1048tlangfe1049tlangnp1048tinsrsid80 22498 Noroaiele rotbaii rte3mase de la separarea hidroxidului de Al contfein teen... 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