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2018, vol. 54, br. 2, str. 225-232
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Dobijanje natrijuma iz aluminijum-oksida (glinice) dobijenog iz letećeg pepela (poletine) uz prisustvo koncentrovanog rastvora natrijum karbonata
Recovery of sodium from alumina-extracted fly ash using concentrated sodium carbonate solution
aNational Engineering Laboratory for Hydrometallurgy Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, PR China + University of Chinese Academy of Science bNational Engineering Laboratory for Hydrometallurgy Cleaner Production Technology, Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, PR China
e-adresa: shma@ipe.ac.cn
Projekat: Project by the National Basic Research Program, No. 2013CB632601
Project by the National Natural Science Foundation of China, No. 51274179.
Sažetak
U ovom radu je predstavljen novi metod za dobijanje natrijuma iz aluminijum oksida (glinice) dobijenog iz letećeg pepela (poletine) uz prisustvo koncentrovanog rastvora Na2 CO3. Natrijum koji je na efikasan način dobijen iz aluminijum oksida (glinice) dobijenog iz letećeg pepela (poletine) se uglavnom sastojao od NaCaHSiO4 . Faktori koji su uticali na postupak su sistematično ispitani, a zatim su ustanovljeni sledeći optimalni uslovi: temperatura reakcije = 180 °C, koncentracija Na2 CO3 = 170 g/L, odnos Č:T (čvrsto:tečno) = 10 mL/g, i vreme reakcije= 2h. Pod optimalnim uslovima, stopa dobijenog Na2 O iz proizvoda sa niskim sadržajem Na2 O od 1,02 wt%, iznosi 93,79%. Dobijeni rezultati ukazuju na to da je ovaj postupak efikasniji od postupka dobijanja natrijuma iz aluminijum oksida (glinice) dobijenog iz letećeg pepela (poletine) uz prisustvo razblaženog NaOH rastvora. Takođe se ovim postupkom izbeglo dobijanje razblaženog NaOH rastvora, i samim tim se smanjio utrošak energije prilikom postupka koncentrovanja i recikliranja natrijuma, u poređenju sa postupkom koji se zasniva na NaOH osnovi. Stoga, dobijanje natrijuma iz aluminijum oksida (glinice) dobijenog iz letećeg pepela (poletine) uz prisustvo koncentrovanog rastvora Na2CO3 predstavlja bolje rešenje za uptrebu u industriji. Ključne reči: Leteći pepeo; NaCaHSiO4.
Abstract
A novel method for the recovery of sodium from alumina-extracted fly ash (AEFA) using concentrated Na2CO3 solution is presented. Sodium was efficiently extracted from AEFA, which was mainly composed of NaCaHSiO4 . The factors influencing the process were systematically investigated, and the optimal conditions were determined to be: reaction temperature = 180 °C, Na2 CO3 concentration = 170 g/L, liquid-to-solid ratio = 10 mL/g, and reaction time = 2 h. Under optimal conditions, a low Na2 O content of 1.02 wt% of the products, with Na2 O extraction rate of 93.79% was achieved. The results indicated that this process was more effective than the recovery of sodium from AEFA using a dilute NaOH solution. Furthermore, this process avoided the production of a dilute NaOH solution, therefore lowering the energy consumption during the concentration and recycling of sodium, when compared with the NaOH-based route. Therefore, the recovery of sodium from AEFA using concentrated Na2CO3 solution is more suitable for use in industrial applications.
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